USB-2416-4AO

USB-based 24-bit, Isolated, High-Channel-Count Multifunction DAQ Device with 4 Analog Outputs

User's Guide

December 2019. Rev 9© Measurement Computing Corporation

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo areeither trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights &Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.
Other product and company names mentioned herein are trademarks or trade names of their respective
companies.
© 2019 Measurement Computing Corporation. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by
photocopying, recording, or otherwise without the prior written permission of Measurement Computing
Corporation.
NoticeMeasurement Computing Corporation does not authorize any Measurement Computing Corporation product for
use in life support systems and/or devices without prior written consent from Measurement Computing
Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation
into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result ininjury. Measurement Computing Corporation products are not designed with the components required, and are
not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis ofpeople.

HM USB-2416-4AO.docx

2

Table of Contents
Preface

About this User's Guide ....................................................................................................................... 5
What you will learn from this user's guide ......................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1

Introducing the USB-2416-4AO ........................................................................................................... 6
Functional block diagram ................................................................................................................................... 6
Chapter 2

Installing the USB-2416-4AO................................................................................................................ 7
Unpacking........................................................................................................................................................... 7
Installing the software ........................................................................................................................................ 7
Connecting the external power supply................................................................................................................ 7
Installing the hardware ....................................................................................................................................... 7
Optional components .......................................................................................................................................... 7
AI-EXP32 ......................................................................................................................................................................... 7
ACC-202 Din-rail kit ........................................................................................................................................................ 7

Connecting an AI-EXP32 to the DSUB37 expansion connector ........................................................................ 8
Configuring the hardware ................................................................................................................................... 8
Calibrating the hardware..................................................................................................................................... 9

Factory calibration ............................................................................................................................................................ 9
Field calibration ................................................................................................................................................................ 9Updating firmware.............................................................................................................................................. 9
Chapter 3

Functional Details ............................................................................................................................... 10
External components ........................................................................................................................................ 10
Screw terminals................................................................................................................................................................10
LEDs ................................................................................................................................................................................13
USB connector .................................................................................................................................................................14
External power connector ................................................................................................................................................1437-pin DSUB expansion connector..................................................................................................................................14
Analog input mode...........................................................................................................................................................14
Thermocouple inputs .......................................................................................................................................................15
Noise filtering, data rate, and throughput rate ..................................................................................................................16
Multiple-channel throughput rates ...................................................................................................................................16

Input isolation ................................................................................................................................................... 17
Analog output terminals (VDAC0 through VDAC3) ....................................................................................... 18
Digital I/O ......................................................................................................................................................... 18
Internal pull-up/pull-down capability...............................................................................................................................18
External pull-up/pull-down capability .............................................................................................................................19

Counter input terminals (CTR0, CTR1) ........................................................................................................... 20
USB-2416-4AO mechanical drawings ............................................................................................................. 20
Chapter 4

Specifications ...................................................................................................................................... 21
Analog input ..................................................................................................................................................... 21
Channel configurations ..................................................................................................................................... 22
Compatible sensors ..........................................................................................................................................................22

Accuracy ........................................................................................................................................................... 22
Thermocouple measurement accuracy .............................................................................................................................223

USB-2416-4AO User's Guide

Analog input DC voltage measurement accuracy ............................................................................................................31
Input bandwidth ...............................................................................................................................................................33
Noise performance ...........................................................................................................................................................33
Channel switching error ...................................................................................................................................................34

Throughput rate ................................................................................................................................................ 35
Analog voltage output ...................................................................................................................................... 36
Analog input/output calibration ........................................................................................................................ 37
Digital input/output........................................................................................................................................... 37
Counter ............................................................................................................................................................. 38
Memory ............................................................................................................................................................ 38
Microcontroller ................................................................................................................................................. 38
Power ................................................................................................................................................................ 39
USB specifications ........................................................................................................................................... 39
Environmental .................................................................................................................................................. 39
Mechanical ....................................................................................................................................................... 40
Screw terminal connector type and pinout ....................................................................................................... 40
Screw terminal pinout ......................................................................................................................................................40

Optional AI-EXP32 expansion module ............................................................................................................ 43
AI-EXP32 screw terminal pinout .....................................................................................................................................45
USB-2416-4AO screw terminal pinout (with AI-EXP32 attached) .................................................................................47

EU Declaration of Conformity ............................................................................................................ 48

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing USB-2416-4AO data acquisition device and lists
device specifications.

Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you arereading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
Bold text is used for the names of objects on a screen, such as buttons, text boxes, and checkboxes.

Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.

Where to find more information
Additional information about the USB-2416-4AO is available on our website at www.mccdaq.com. You canalso contact Measurement Computing Corporation by phone, fax, or email with specific questions.


Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: techsupport@mccdaq.com
Phone: 508-946-5100 and follow the instructions for reaching Tech Support

For international customers, contact your local distributor. Refer to the International Distributors section on our
website at www.mccdaq.com/International.

5Introducing the USB-2416-4AO

Chapter 1

The USB-2416-4AO is a USB multifunction measurement and control device that provides the following
features:







16 differential (DIFF) or 32 single-ended (SE) analog inputs with 24-bit resolution and sample rates up to
1 kS/so Each channel is software selectable as SE or DIFF; you lose one SE channel for each DIFF channelpairo 16 analog inputs can be configured as differential thermocouple (TC) inputs; includes built-in coldjunction compensation and open thermocouple detectiono Add up to 32 SE/16 DIFF channels by connecting the USB-2416-4AO to an AI-EXP32 expansion
module software-selectable analog input ranges of ±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V,±0.312 V, ±0.156 V, and ±0.078 V.
A minimum of 500 VDC input isolation between field wiring and the USB interface.
Eight digital I/O lines and two 32-bit counters, which can be expanded 24 DIO channels by connecting theUSB-2416-4AO to an AI-EXP32 expansion module.
Four 16-bit analog output channels with an update rate 1 kS/s maximum and an output range of ±10 V.
Six banks of removable screw-terminal blocks provide connectivity to the analog input channels, digital I/O
lines, and counter/timer channels.

The USB-2416-4AO is powered by an external 5 V, 2 A regulated power supply (PS-5V2AEPS) that is shippedwith the device.

Functional block diagram
USB-2416-4AO functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

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Installing the USB-2416-4AO

Chapter 2

UnpackingAs with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
Contact us immediately if any components are missing or damaged.

Installing the software
Refer to the MCC DAQ Quick Start and the USB-2416-4AO product page on our website for information about
the software that supports the device.
Install the software before you install your device
The driver needed to run the USB-2416-4AO is installed with the software. Therefore, you need to install thesoftware package you plan to use before you install the hardware.

Connecting the external power supply
Power to the USB-2416-4AO is provided with the 5 V external power adapter (PS-5V2AEPS). Connect theadapter cord to the power connector on the USB-2416-4AO, and plug the AC adapter into an electrical outlet.
Refer to Figure 4 on page 10 for the location of the Power LED.

Installing the hardware
Connect the USB-2416-4AO using the cable provided to a USB port on a computer running Windows.
Windows finds and installs the device driver automatically and notifies you that the device is ready to use.
Caution! To avoid losing data and/or communication with the USB-2416-4AO, do not disconnect the USB
cable while the USB LED is on.
If the Activity LED turns off
If the Activity LED turns on but then turns off, the computer has lost communication with the USB-2416-4AO.
To restore communication, disconnect the USB cable from the computer, and then reconnect it. This should
restore communication, and the Activity LED should turn back on.

Optional components
AI-EXP32
The AI-EXP32 analog input expansion device adds up to 16 differential or 32 single-ended inputs.

ACC-202 Din-rail kit
Use the ACC-202 accessory for mounting a USB-2416-4AO to a standard DIN rail.
The thread-forming screws attach the DIN rail clip to your device.
Two ACC-202 kits are required to mount both the USB-2416-4AO andthe AI-EXP32 to a DIN rail.

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Thread-forming
screwsUSB-2416-4AO User's Guide

Installing the USB-2416-4AO

Connecting an AI-EXP32 to the DSUB37 expansion connector
Use the 37-pin expansion connector to connect the USB-2416-4AO to an AI-EXP32 expansion module.
1.

To connect the two devices directly to each other, complete the following steps:

2.

Disconnect the USB cable from the USB-2416-4AO.

3.

Remove the external power cable from the USB-2416-4AO.

4.

Connect the two devices together by inserting the AI-EXP32 male DSUB37 connector into the female
DSUB37 connector on the USB-2416-4AO.

Figure 2. USB-2416-4AO directly connected to an AI-EXP32

5.

Turn the connected devices over and secure the connection by screwing the connection plate to bothdevices, as shown below.

Figure 3. USB-2416-4AO secured to an AI-EXP32

6.

Connect the external power supply to the power input port of the USB-2416-4AO, and then plug it into an
AC outlet.

7.

Connect the USB cable from the USB-2416-4AO to the host computer USB port.
Connect to a USB 2.0 high speed hub to achieve the highest transfer rate (480 Mbps). When connected to a
USB 1.1 full-speed port, the transfer rate is limited to 12 Mbps.

Configuring the hardware
Except for the DIO pull-up selection, all hardware configuration options on the USB-2416-4AO are software
controlled. You can select some of the configuration options using InstaCal, such as the analog input
configuration (single-ended or differential channels). When measuring from thermocouples, make sure you
configure the channels for differential mode.
Caution! Turn off power to all devices connected to the system before making connections. Electrical shock
or damage to equipment can result even under low-voltage conditions.
Information on signal connections
General information regarding signal connection and configuration is available in the Guide to DAQ Signal
Connections. This document is available on our web site at www.mccdaq.com/support/DAQ-SignalConnections.aspx.

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USB-2416-4AO User's Guide

Installing the USB-2416-4AO

Calibrating the hardware
Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Returnthe device to Measurement Computing Corporation when calibration is required. The recommended calibrationinterval is one year.

Field calibration
The USB-2416-4AO supports field calibration. Calibrate the device using InstaCal whenever the ambient
temperature changes by more than ±10 °C from the last calibration.
You can perform this procedure with thermocouple and voltage inputs connected to the input terminal blocks.
To calibrate the AOUT circuits, disconnect the analog outputs at the terminal block pins to ensure optimum
calibration results
Caution! Always handle components carefully, and never touch connector terminals or circuit components
unless you are following ESD guidelines in an appropriate ESD-controlled area. These guidelines
include using properly-grounded mats and wrist straps, ESD bags and cartons, and related
procedures.
Avoid touching board surfaces and onboard components. Only handle boards by their edges. Make
sure the USB-2416-4AO does not come into contact with foreign elements such as oils, water, andindustrial particulate.
The discharge of static electricity can damage some electronic components. Semiconductor
devices are especially susceptible to ESD damage.

Updating firmware
Your DAQ device contains firmware that can be updated in the field if required. Firmware is available fordownload at www.mccdaq.com/firmware.aspx. MCC recommends that you check this page periodically to see
if an update to your device firmware is available.

9Chapter 3

Functional Details
External components
The USB-2416-4AO components are shown in Figure 4.

Figure 4. USB-2416-4AO components
1

4

External power connector

2

Screw terminals (removable) for analog/TC
input and counter inputs
Power (top) and Activity (bottom) LEDs

5

Screw terminals (removable) for
analog/TC input and counter input

3

USB connector

637-pin DSUB expansion connector(connects to AI-EXP32)

Screw terminals
The USB-2416-4AO has six groups of screw terminals—three on each side of the enclosure – that provide thefollowing connections:








16 analog/TC inputs (CH0H/CH0L to CH15H/CH15L)
Four analog outputs (VDAC0 to VDAC3)
Eight digital I/O (DIO0 to DIO7)
Two event counter inputs (CTR0, CTR1)
One power output (+VO)
Nine analog grounds (GND)
Two digital grounds (DGND)

Use 16 AWG to 30 AWG wire when making connections to the screw terminals. Connectors are identified in
Figure 5 through Figure 7 on pages 11-13.

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USB-2416-4AO User's Guide

Functional Details

Figure 5. 16-channel differential mode pinout

Differential connection guidelines
When connecting differential voltage inputs to a floating voltage source, make sure there is a DC return pathfrom each voltage input to ground. You make this path by connecting a resistor from each input to a GND pin.
A value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to GND.
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND to
avoid settling time and accuracy errors. For thermocouple channels, do not provide a return path to ground. Thisis done internally.

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Functional Details

Figure 6. 32-channel single-ended mode pinout

12USB-2416-4AO User's Guide

Functional Details

Figure 7. 32-channel single-ended mode pinout when connected to AI-EXP32

LEDs
When the USB-2416-4AO is connected to a computer, in its normal idle state both LEDs are solid green.
Power LED
The Power LED is the top LED on the right side of the USB-2416-4AO housing.
The Power LED blinks when you plug the power supply into the USB-2416-4AO, and continues to blink while
the device is being initialized. If it continues blinking for more than ½ second, then there is a problem with theUSB-2416-4AO and you should cycle the power.
If an application issues a "blink LED" command, then the power LED blinks a few times.

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Functional Details

Activity LED
The (USB) Activity LED is the bottom LED on the right side of the USB-2416-4AO housing. It blinks rapidly
when both the USB cable and external power cables are plugged in. It continues blinking rapidly while thedevice is connecting to the computer, and then turns solid.
Whenever the device receives a USB command, the Activity LED blinks off and then returns to solid green.
When an analog in scan is running, the Activity LED blinks continuously.

USB connector
The USB connector is on the right side of the USB-2416-4AO provides communication.

External power connector
The USB-2416-4AO require external power through this connector to provide sufficient power for the USB2416-4AO.
Connect the PS-5V2AEPS power supply to the external power supply connector. This power supply provides
5 VDC, 2 A power to the USB-2416-4AO.

37-pin DSUB expansion connector
The USB-2416-4AO expansion connector is intended to connect directly to an AI-EXP32 expansion module.
Do not attempt to use any of the expansion port pins for any other purpose.
Power down the USB-2416-4AO before connecting it to an AI-EXP32.

Figure 8. DSUB37 expansion connector pinout

Analog input mode
The USB-2416-4AO makes high-resolution voltage measurements in either a single-ended or fully differential
mode. You can configure the USB-2416-4AO for the following voltage input ranges.










±20 V
±10 V
±5 V
±2.5 V±1.25 V
±0.625 V±0.3125 V±0.15625 V±0.078125 V

Each analog input channel has the following measurement parameters:

signal type of volts or thermocouple type J, K, T, E, R, S, B, or N
full scale voltage from -20 to + 20 VDC

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Functional Details

Thermocouple inputs
You can make up to 16 high-resolution differential thermocouple measurements with the USB-2416-4AO.
Built-in cold-junction sensors are provided for each of the screw-terminal blocks, and any supported TC typecan be attached to any of the 16 thermocouple channels.
Do not connect thermocouples as single-ended—doing so can cause false readings.
You do not need to use ground-referencing resistors because the analog front-end circuit level-shifts thethermocouple's output into the common-mode input range of the A/D.
When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND to
avoid settling time and accuracy errors.
The USB-2416-4AO also provides an open thermocouple detection (OTD) feature for each of the analog input
channels configured for thermocouple measurement. This feature is automatically enabled as part of the overallacquisition process and detects if an open-circuit condition exists at the thermocouple sensor.
The USB-2416-4AO provides electrostatic discharge (ESD) protection for each of the thermocouple inputs.
However, before handling thermocouple sensors, follow standard ESD practices and discharge any accumulated
ESD charge.
The USB-2416-4AO includes an ESD protection device at each of the analog input terminal block pins. If an
ESD or transient voltage is coupled into the device, the input protection device(s) clamps the voltage to protect
the thermocouple input circuitry from possible damage.
Once the thermocouple sensor is connected to the USB-2416-4AO, the configuration options have been
selected, and the recommended 45-minute warm up has elapsed, the USB-2416-4AO is ready to make highresolution differential voltage measurements.
Cold junction compensation (CJC) is needed to compensate for the additional thermal EMF's generated byconnecting the thermocouple leads to the USB-2416-4AO terminal blocks.
CJC is performed using a high-resolution temperature sensor connected close to the USB-2416-4AO's terminal
blocks. The USB-2416-4AO includes four separate CJC sensors—two on each side of the PCB. Software
corrects for the additional thermocouples created at the terminal.
Once the A/D and CJC data is collected, the application software uses this data to linearize to an accurate
temperature reading. The thermocouple linearization uses the latest NIST linearization coefficients for each of
the eight thermocouple types supported by the USB-2416-4AO.
Figure 9 shows a typical thermocouple connection.

Figure 9. Differential thermocouple connection example

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USB-2416-4AO User's Guide

Functional Details

Noise filtering, data rate, and throughput rate
Although the USB-2416-4AO A/D converter has a maximum data rate of 3,750 S/s, the actual throughput rate
you observe for voltage and temperature data is determined by these formulas.
Maximum single-channel throughput:

1
1+ 640 µs
data rate1

 1

 data rate + 640 μs nMaximum multiple-channel throughput: ∑ 

where n is the number of channels

See Table 18 and Table 19 in the Specifications chapter for details.
This drop-off in throughput rate is due to the USB-2416-4AO's noise filtering feature. You can control theamount of the noise filtering by adjusting the data rate setting. By reducing the data rate, the averaging ofsamples increases, and noise drops correspondingly.
Figure 10 illustrates this inverse relationship. This graph applies to the A/D converter only—do not expect thislevel of performance from the USB-2416-4AO itself.

Figure 10. USB-2416-4AO A/D converter data rate vs. noise graphIf low noise is your main concern, you can operate the USB-2416-4AO at very low data rates starting from
2.5 S/s. At low rates, much of the noise is averaged out of the data, and issues such as reference noise becomeless important.
At higher data rates, higher-frequency noise sources are not averaged out and begin to be troublesome. These
noise sources include the noise inherent in the A/D converter itself, which is not reducible.
Since thermocouples can pick up noise in your environment, select a data rate based on the primary noise
frequency. For example, to reduce the effect of 60 Hz noise, select a data rate of 60 (or a sub-multiple of 60,
such as 10 or 20).

Multiple-channel throughput rates
When setting different sample rates for different channels, be aware that the all channels will be sampled within
the same sample window based on the channel with the lowest sample rate.
For example, if you set a 10 Hz data rate for channel 0, and a 50 Hz data rate for channel 1, basically, bothchannels pass the same number of samples per second to the host computer. However, more averaging is
performed on channel 0's samples; therefore, channel 0 is sampled at a higher resolution.
The USB-2416-4AO's A/D converter performs averaging, and the number of averages equals 30,000/data rate.

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In this example, channel 0 is sampled 3000 times over 100 ms, and all samples are averaged into one sample.
Then, channel 1 is sampled 600 times over 20 ms, and samples are likewise averaged into one sample.
The final samples are available to you at a maximum rate of about 8 Hz (8.245 Hz).

Figure 11. USB-2416-4AO data rate vs. resolution example

Input isolation
The USB-2416-4AO is an isolated data acquisition device. The analog input, digital I/O, counters, and all thedigital control/timing are referenced to an isolated ground as shown in the figure below. This ground isphysically and electrically separate from the ground use by the circuit connected to the system bus interface.
Isolation provides a barrier between the host computer and potentially hazardous voltages by physically andelectrically separating two parts of the measurement device.
The non-isolated ground is common to the chassis ground of the computer, while the isolated ground is not.
All analog measurements are made relative to the isolated ground. See Figure 12 for details.

Figure 12. USB-2416-4AO input isolation diagram

When making measurements in industrial environments, DAQ devices can encounter hazardous voltages,
transients, large common mode voltages and fluctuating ground potentials. Any one of these issues canseriously degrade the measurement accuracy of the device and possibly damage the measurement instrument.
To overcome these issues, some DAQ devices provide physical and electrical isolation. Some of the benefits ofisolation include:

Safety: A DAQ device employing physical and electrical isolation helps to keep high voltages andtransients from damaging the system-side host PC.
Ground loops: Improper grounding of the signal source that the DAQ device is measuring is one of themost common sources of noise and measurement inaccuracies. Isolation improves the measurement
accuracy by physically preventing ground loops. Ground loops—a common source of noise and error—are
the results of a measurement system having multiple grounds at different potentials.
Common mode rejection: With isolation, a DAQ device can measure small signals in the presence of largecommon mode voltages. Isolation increases the measurement system's ability to reject common mode
voltages. The common mode voltage is the signal that is common to both the positive and negative inputsof the measurement device but is not part of the signal to measure.
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Functional Details

Analog output terminals (VDAC0 through VDAC3)The USB-2416-4AO has four 16-bit analog output channels with a ±10 V output range.
Analog outputs can be updated at a maximum rate of 1 kS/s.

Digital I/O
The USB-2416-4AO provides up to eight digital I/O lines with read/write rates of 500 port reads or single bit
reads per second.
Digital input voltage ranges of 0 V to 15 V are permitted, with thresholds of 0.6 V (low) and 2.6 V (high). EachDIO channel is an open-drain, which, when used as an output, is capable of sinking up to 150 mA for directdrive applications. The maximum sink current is 150 mA per eight-channel bank, or if all eight channels areused, 18 mA (maximum) per channel.
Figure 13 is an example of a typical DIO connection. The figure represents connections for one channel. The
other seven channels are connected in the same manner.

Figure 13. Digital output connection example

Internal pull-up/pull-down capability
Each of the eight DIO bits on the USB-2416-4AO has a 47 kΩ pull-up/pull-down resistor. To configure thesebits for the 0 V pull-down option, you must open the USB-2416-4AO case to access the three-pin jumper
labeled JP1.
To open the case and set the JP1 jumper, do the following.
1.

Turn over the USB-2416-4AO and rest it on its top on a flat, stable surface.

2.

Remove the five screws shown in Figure 14 from the bottom of the module.

3.

Holding both the top and bottom sections of the module, turn it over, rest it on the surface, and carefully
remove the top portion of the case.

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USB-2416-4AO User's Guide

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Figure 14. Location of screws connecting bottom and top sections of case

Figure 15. Location and default configuration (pull-up) of JP1

The pull-up/pull-down voltage is common to all of the internal 47 kΩ resistors.

External pull-up/pull-down capability
You can also place an external pull-up resistor on any of the DIO bits. This enables you to pull the DIO bit up toa voltage that exceeds the internal +5 V pull-up voltage.
When using external pull-up resistors, note the following:You should either remove the JP1 jumper or store it by attaching it to one of the three pins.
When using external pull-up resistors, the internal resistors cause slight impedance shifts to digital lines in
the on state as the number of lines in the off state changes.

Figure 16. Digital I/O external resistor configuration

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Counter input terminals (CTR0, CTR1)
Two 32-bit event counters accept frequency inputs up to 1 MHz. The internal counter increments when TTLlevels transition from low to high.

USB-2416-4AO mechanical drawings

Figure 17. Circuit board (top) and enclosure dimensions

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Chapter 4

Specifications

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
All specifications apply to all temperature and voltage input channels unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input
Table 1. General analog input specifications
Parameter

Conditions

A/D converter typeA/D data rates
Throughput

Number of channels

Input isolation
Channel configurations

Input voltage range

Absolute maximum
input voltage

Thermocouple mode

±0.078125 V

Voltage mode (Note 1)±20 V, ±10 V, ±5 V, ±2.5 V, ±1.25 V, ±0.625 V, ±0.3125 V,±0.15625 V, ±0.078125 V, software-configurable
 ±30 V max (power on)
 ±10 V max (power off) 2 GΩ (power on)
 390Ω (power off)
±10.6 nA
590 pf±20.01 V max

CxH-CxL relative to
GND

Input impedance
Input leakage current
Input capacitance
Maximum working
voltage (signal +common mode)
Common mode
rejection ratio (Note 1)

ADC resolution
Crosstalk
Input coupling
Channel gain queue
Warm-up time
Open thermocouple
detectSpecification
ADS1256, 24-bit Sigma Delta
3750 samples per second (S/s), 2000 S/s, 1000 S/s, 500 S/s, 100 S/s,
60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s Single channel: 2.5 Hz to 1102.94 Hz, software selectable Multiple channels: 0.16 Hz to 1102.94 Hz, software selectable
See "Throughput rate" on page 35 for details.
Up to 32 channels individually software-configurable as singleended or differential
Thermocouples require differential mode. For each channel
configured as differential, you essentially lose one single-ended
channel. You can add channels by connecting to an AI-EXP32.
500 VDC min between field wiring and USB interface
Temperature sensor input, software programmable to match sensor
type
Voltage input

Voltage mode: ±20 V
range
Voltage mode: all othervoltage input ranges
Thermocouple mode,(fIN = 60 Hz)
Voltage mode,(fIN =60 Hz, all input ranges)
Adjacent channels
Up to 64 elements±10.25 V max
110 dB
90 dB
24 bits
100 dBDC
Software-configurable channel and range
45 minutes min
Automatically enabled when the channel is configured for athermocouple sensor.

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USB-2416-4AO User's Guide

Specifications

Parameter

Conditions

Specification

CJC sensor accuracy

15 °C to 35 °C
0 °C to 55 °C±0.15 °C typ±0.5 °C max

Note 1:

Placing a notch of the A/D digital filter at 60 Hz (setting A/D data rate = 60 S/s, 10 S/s, 5 S/s or 2.5 S/s) further
improves the common mode rejection of this frequency.

Channel configurations
When any item is changed, the firmware stores channel configurations in the EEPROM of the isolated
microcontroller. An external application issues commands over the USB to make changes, and the configuration
is made non-volatile through the use of the EEPROM.
When connecting differential voltage inputs to a floating voltage source, provide a DC return path from eachvoltage input to ground. To do this, connect a resistor from each input to a GND pin (pins 18, 36, 39, 42, 44, 46,
66, 81, 84). A value of approximately 100 kΩ can be used for most applications.
Leave unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
For each voltage/thermocouple channel configured as differential, you essentially lose one single-ended
channel. You can add channels by connecting to an AI-EXP32.
Table 2. Channel configurations
ChannelCategory

Specification

CxH/CxL
CxH/CxL
CxH/CxL

Thermocouple
Voltage
Voltage

16 differential channels
32 individually-configurable channels that can be configured as either single-ended ordifferential.

Compatible sensors
Table 3. Compatible sensor type specifications
Parameter

Conditions

Thermocouple

J: -210 °C to 1200 °C
K: -270 °C to 1372 °C
R: -50 °C to 1768 °C
S: -50 °C to 1768 °C
T: -270 °C to 400 °C
N: -270 °C to 1300 °C
E: -270 °C to 1000 °C
B: 0 °C to 1820 °C

Accuracy
Thermocouple measurement accuracy
Thermocouple measurement accuracy specifications include polynomial linearization error, cold-junction
compensation measurement error, and system noise. These specs are for one year, or 3000 operating hours,
whichever comes first.
There is a CJC sensor for each terminal block of the module. The accuracy listed below assumes the screw
terminals are at the same temperature as the CJC sensor.
The accuracy errors shown do not include the inherent accuracy error of the thermocouple sensor itself. Contact
your thermocouple supplier for details on the actual thermocouple sensor accuracy limitations.

22

USB-2416-4AO User's Guide

Specifications

Connect thermocouples to the USB-2416-4AO such that they are floating with respect to GND (pins 18, 36, 39,
42, 44, 46, 66, 81, 84, 93, and 94).
When configuring thermocouple sensors, keep any stray capacitance relative to GND (pins 18, 36, 39, 42, 44,
46, 66, 81, 84) as small as possible to avoid settling time and accuracy errors.
The USB-2416-4AO GND and DGND pins are isolated from earth ground. You can connect thermocouple
sensors to voltages referenced to earth ground as long as isolation between the GND/DGND pins and earth
ground is maintained.
Table 4. J type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C-210 °C
0 °C
1200 °C

2.572 °C
0.935 °C
1.869 °C
2.572 °C
0.935 °C
1.869 °C
2.572 °C
0.935 °C
1.869 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C
2.442 °C
0.881 °C
1.821 °C

1.416 °C
0.469 °C
1.456 °C
1.416 °C
0.469 °C
1.456 °C
1.416 °C
0.469 °C
1.456 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C
1.334 °C
0.415 °C
1.408 °C

0.022

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.022

0.022

0.022

0.022

0.022

0.022

0.022

0.022

0.022

0.022

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

23

USB-2416-4AO User's Guide

Specifications

Table 5. K type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate

Sensor temperature
range

Accuracy error
maximum

Accuracy error
typicalTempco(°C/°C)

3750 S/s-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C-210 °C
0 °C
1372 °C

2.917 °C
1.017 °C
2.478 °C
2.917 °C
1.017 °C
2.478 °C
2.917 °C
1.017 °C
2.478 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C
2.735 °C
0.948 °C
2.396 °C

1.699 °C
0.526 °C
2.022 °C
1.699 °C
0.526 °C
2.022 °C
1.699 °C
0.526 °C
2.022 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C
1.524 °C
0.457 °C
1.941 °C

0.029

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

24

USB-2416-4AO User's Guide

Specifications

Table 6. N type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate

Sensor temperature
range

Accuracy error
maximum

Accuracy error
typicalTempco(°C/°C)

3750 S/s-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C-200 °C
0 °C
1300 °C

3.480°C
1.201 °C
1.991 °C
3.480°C
1.201 °C
1.991 °C
3.480°C
1.201 °C
1.991 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C
3.196°C
1.096 °C
1.915 °C

2.030 °C
0.659 °C
1.600 °C
2.030 °C
0.659 °C
1.600 °C
2.030 °C
0.659 °C
1.600 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C
1.750 °C
0.553 °C
1.524 °C

0.029

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

0.029

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

25

USB-2416-4AO User's Guide

Specifications

Table 7. R type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C

4.826 °C
2.117 °C
2.842 °C
4.826 °C
2.117 °C
2.842 °C
4.826 °C
2.117 °C
2.842 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C
4.065 °C
1.805 °C
2.619 °C

3.133 °C
1.424 °C
2.347 °C
3.133 °C
1.424 °C
2.347 °C
3.133 °C
1.424 °C
2.347 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C
2.379 °C
1.113 °C
2.123 °C

0.082

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.082

0.082

0.082

0.082

0.082

0.082

0.082

0.082

0.082

0.082

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

26

USB-2416-4AO User's Guide

Specifications

Table 8. S type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C-50 °C
250 °C
1768 °C

4.510 °C
2.165 °C
3.187 °C
4.510 °C
2.165 °C
3.187 °C
4.510 °C
2.165 °C
3.187 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C
3.798 °C
1.853 °C
2.922 °C

2.930 °C
1.468 °C
2.597 °C
2.930 °C
1.468 °C
2.597 °C
2.930 °C
1.468 °C
2.597 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C
2.226 °C
1.156 °C
2.332 °C

0.088

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.088

0.088

0.088

0.088

0.088

0.088

0.088

0.088

0.088

0.088

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

27

USB-2416-4AO User's Guide

Specifications

Table 9. B type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s

250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C
250 °C
700 °C
1820 °C

5.489 °C
2.283 °C
2.202 °C
5.489 °C
2.283 °C
2.202 °C
5.489 °C
2.283 °C
2.202 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C
4.387 °C
1.879 °C
1.962 °C

3.956 °C
1.743 °C
1.842 °C
3.956 °C
1.743 °C
1.842 °C
3.956 °C
1.743 °C
1.842 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C
2.885 °C
1.340 °C
1.601 °C

0.14

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.14

0.14

0.14

0.14

0.14

0.14

0.14

0.14

0.14

0.14

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

28

USB-2416-4AO User's Guide

Specifications

Table 10. E type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data
rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C-200 °C
0 °C
1000 °C

2.413 °C
1.069 °C
1.575 °C
2.413 °C
1.069 °C
1.575 °C
2.413 °C
1.069 °C
1.575 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C
2.306 °C
1.017 °C
1.539 °C

1.352 °C
0.551 °C
1.211 °C
1.352 °C
0.551 °C
1.211 °C
1.352 °C
0.551 °C
1.211 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C
1.244 °C
0.499 °C
1.175 °C

0.017

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.017

0.017

0.017

0.017

0.017

0.017

0.017

0.017

0.017

0.017

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

29

USB-2416-4AO User's Guide

Specifications

Table 11. T type thermocouple accuracy specifications, including CJC measurement error.
All specifications are (±).
A/D data rate

Sensor temperature
range

Accuracy error,
maximum

Accuracy error,
typicalTempco(°C/°C)

3750 S/s-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C-200 °C
0 °C
400 °C

2.821 °C
1.050 °C
0.957 °C
2.821 °C
1.050 °C
0.957 °C
2.821 °C
1.050 °C
0.957 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C
2.644 °C
0.979 °C
0.912 °C

1.676 °C
0.558 °C
0.595 °C
1.676 °C
0.558 °C
0.595 °C
1.676 °C
0.558 °C
0.595 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C
1.505 °C
0.487 °C
0.551 °C

0.027

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

0.027

0.027

0.027

0.027

0.027

0.027

0.027

0.027

0.027

0.027

To achieve the thermocouple accuracies listed above, the USB-2416-4AO should be warmed up for 45 minutes
after the initial power on. The accuracies listed above are only guaranteed if the USB-2416-4AO is housed in its
plastic enclosure.

30

USB-2416-4AO User's Guide

Specifications

Analog input DC voltage measurement accuracy
Table 12. DC Accuracy components and specifications. All values are (±)
Range

A/D
data
rate

Gain error(% ofreading)

Offseterror

INL error (%of range)

Absolute
accuracyGaintemperature
coefficient (%reading/°C)

Offsettemperature
coefficient(µV/°C)±20 V

3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s

0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.002
0.00150.00150.00150.00150.00150.00150.00150.0015

98 µV
61 µV
27 µV
12 µV
11 µV
15 µV
12 µV
12 µV
13 µV
14 µV
14 µV
42 µV
36 µV
15 µV
7 µV
8 µV
10 µV
8 µV
6 µV
6 µV
6 µV
6 µV
21 µV
21 µV
8 µV
6 µV
7 µV
8 µV
6 µV
6 µV
6 µV
6 µV
6 µV
13 µV
13 µV
9 µV
9 µV
9 µV
10 µV
8 µV
8 µV
8 µV
8 µV
8 µV

0.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.0008857.600 µV
821.185 µV
787.226 µV
772.193 µV
771.014 µV
774.689 µV
771.603 µV
772.070 µV
773.400 µV
773.579 µV
773.537 µV
421.600 µV
416.004 µV
395.252 µV
387.216 µV
288.470 µV
290.090 µV
287.719 µV
285.672 µV
285.982 µV
286.003 µV
286.086 µV
210.800 µV
210.712 µV
198.254 µV
146.499 µV
147.285 µV
148.216 µV
146.196 µV
145.996 µV
145.820 µV
145.817 µV
145.810 µV
83.000 µV
83.062 µV
79.487 µV
66.232 µV
66.685 µV
67.014 µV
65.314 µV
65.901 µV
65.759 µV
65.800 µV
65.769 µV

0.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.0006

3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1

±10 V

±5 V

±2.5 V31

USB-2416-4AO User's Guide

Specifications

Range

A/D
data
rate

Gain error(% ofreading)

Offseterror

INL error (%of range)

Absolute
accuracyGaintemperature
coefficient (%reading/°C)

Offsettemperature
coefficient(µV/°C)±1.25 V3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s
3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s

0.00250.00250.00250.00250.00250.00250.00250.00250.00250.00250.0025
0.003
0.003
0.003
0.003
0.003
0.002
0.002
0.002
0.002
0.002
0.002
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.005
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006
0.006

7 µV
9 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
8 µV
7 µV
7 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
7 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV

0.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00080.00050.00050.00050.00050.00050.00050.00050.00050.00050.00050.00050.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00050.00050.00050.00050.00050.00050.00050.00050.00050.00050.000548.050 µV
50.632 µV
49.359 µV
49.709 µV
49.604 µV
49.417 µV
49.610 µV
49.584 µV
49.482 µV
49.489 µV
49.489 µV
28.775 µV
28.679 µV
27.762 µV
28.167 µV
28.088 µV
21.709 µV
21.773 µV
21.746 µV
21.927 µV
21.803 µV
21.784 µV
24.500 µV
23.443 µV
23.086 µV
23.094 µV
23.084 µV
23.288 µV
23.232 µV
23.191 µV
23.125 µV
23.182 µV
23.127 µV
15.856 µV
15.793 µV
15.902 µV
16.118 µV
15.877 µV
16.014 µV
16.122 µV
15.903 µV
15.927 µV
15.981 µV
15.979 µV

0.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.0006

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1

±0.625 V±0.3125 V±0.15625 V

32

USB-2416-4AO User's Guide

Specifications

Range

A/D
data
rate

Gain error(% ofreading)

Offseterror

INL error (%of range)

Absolute
accuracyGaintemperature
coefficient (%reading/°C)

Offsettemperature
coefficient(µV/°C)±0.078125 V

3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s

0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035
0.035

6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV
6 µV

0.00090.00090.00090.00090.00090.00090.00090.00090.00090.00090.000933.547 µV
34.252 µV
33.696 µV
34.002 µV
34.005 µV
33.866 µV
34.026 µV
33.933 µV
33.937 µV
33.969 µV
33.934 µV

0.00060.00060.00060.00060.00060.00060.00060.00060.00060.00060.0006

1
1
1
1
1
1
1
1
1
1
1

Input bandwidth
Table 13. input bandwidth
A/D data rate

–3 db Bandwidth (Hz)3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s

1615
878
441
221
44.2
26.5
22.1
11.1
4.42
2.21
1.1

Noise performance
For the peak-to-peak noise distribution test, a differential input channel is connected to GND at the input
terminal block, and 50,000 samples are acquired at the maximum rate available at each setting.
Table 14. Peak-to-peak noise performance specifications (µV)
A/D data rate
Range

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s±0.078125 V

13.47

15.02

9.17

6.88

4.28

4.16

4.00

3.57

2.28

2.13

2.40

±20 V
±10 V
±5 V
±2.5 V±1.25 V
±0.625 V±0.3125 V±0.15625 V

230.31126.84
56.74
32.96
18.57
18.88
15.33
13.28

186.92100.14
47.56
28.79
17.52
16.58
14.76
16.84

126.84
71.76
34.21
17.94
13.83
8.45
8.19
7.47

100.14
45.06
25.87
14.19
9.30
7.41
6.94
6.61

33

57.22
30.52
16.21
7.51
5.48
5.32
4.75
5.70

57.22
30.52
14.31
7.09
5.48
4.80
4.69
4.48

49.59
26.70
14.31
7.09
5.01
4.38
4.49
4.48

47.58
19.07
14.30
5.72
3.81
3.86
3.70
4.24

23.84
11.92
5.96
3.81
3.34
2.50
3.34
2.66

23.84
9.54
4.77
2.86
3.34
2.61
2.56
3.07

14.31
9.54
4.77
2.38
2.86
1.98
2.45
2.29

USB-2416-4AO User's Guide

Specifications

Table 15. RMS noise performance specifications (µVRMS)
A/D data rate
Range

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

±20 V
±10 V
±5 V
±2.5 V±1.25 V
±0.625 V±0.3125 V±0.15625 V±0.078125 V

34.90
19.22
8.60
4.99
2.81
2.86
2.32
2.01
2.04

28.32
15.17
7.21
4.36
2.66
2.51
2.24
2.55
2.28

19.22
10.87
5.18
2.72
2.10
1.28
1.24
1.13
1.39

15.17
6.83
3.92
2.15
1.41
1.12
1.05
1.00
1.04

8.67
4.62
2.46
1.14
0.83
0.81
0.72
0.86
0.65

8.67
4.62
2.17
1.07
0.83
0.73
0.71
0.68
0.63

7.51
4.05
2.17
1.07
0.76
0.66
0.68
0.68
0.60

7.22
2.89
2.16
0.87
0.58
0.58
0.56
0.64
0.54

3.61
1.81
0.90
0.58
0.51
0.38
0.51
0.40
0.35

3.61
1.44
0.72
0.43
0.51
0.40
0.39
0.47
0.32

2.17
1.44
0.72
0.36
0.43
0.30
0.37
0.35
0.36

Table 16. Noise-free resolution specifications (bits)
A/D data rate
Range

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

±20 V
±10 V
±5 V
±2.5 V±1.25 V
±0.625 V±0.3125 V±0.15625 V±0.078125 V

17.4
17.2
17.4
17.2
17.0
16.0
15.3
14.5
14.5

17.7
17.6
17.6
17.4
17.1
16.2
15.3
14.1
14.3

18.2
18.1
18.1
18.1
17.4
17.1
16.2
15.3
15.0

18.6
18.7
18.5
18.4
18.0
17.3
16.4
15.5
15.4

19.4
19.3
19.2
19.3
18.8
17.8
17.0
15.7
16.1

19.4
19.3
19.4
19.4
18.8
18.0
17.0
16.1
16.2

19.6
19.5
19.4
19.4
18.9
18.1
17.0
16.1
16.2

19.6
20.0
19.4
19.7
19.3
18.3
17.3
16.1
16.4

20.6
20.6
20.6
20.3
19.5
18.9
17.5
16.8
17.0

20.6
21.0
21.0
20.7
19.5
18.8
17.9
16.9
17.1

21.4
21.0
21.0
21.0
19.7
19.2
17.9
17.1
16.9

10 S/s5 S/s

2.5 S/s

Channel switching error
Table 17. Step response accuracy specifications
Accuracy
Range

3750 S/s 2000 S/s 1000 S/s 500 S/s

100 S/s

60 S/s50 S/s25 S/s±20 V
0.0011% 0.0006% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001% 0.0001%±10 V
0.0010% 0.0008% 0.0005% 0.0004% 0.0002% 0.0002% 0.0003% 0.0002% 0.0001% 0.0001% 0.0001%±5 V
0.0009% 0.0008% 0.0004% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001% 0.0001%±2.5 V
0.0010% 0.0007% 0.0008% 0.0004% 0.0003% 0.0002% 0.0002% 0.0002% 0.0002% 0.0001% 0.0001%±1.25 V
0.0013% 0.0009% 0.0008% 0.0007% 0.0004% 0.0004% 0.0003% 0.0003% 0.0003% 0.0003% 0.0003%±0.625 V
0.0022% 0.0016% 0.0011% 0.0011% 0.0007% 0.0007% 0.0005% 0.0005% 0.0004% 0.0005% 0.0003%±0.3125 V 0.0031% 0.0031% 0.0020% 0.0017% 0.0015% 0.0012% 0.0010% 0.0010% 0.0012% 0.0009% 0.0009%±0.15625 V 0.0056% 0.0062% 0.0048% 0.0037% 0.0032% 0.0025% 0.0024% 0.0021% 0.0019% 0.0022% 0.0016%±0.078125 V 0.0114% 0.0123% 0.0076% 0.0070% 0.0041% 0.0051% 0.0046% 0.0036% 0.0032% 0.0030% 0.0034%

Channel switching error is defined as the accuracy that can be expected after one conversion when switchingfrom a channel with a DC input at one extreme of full scale to another channel with a DC input at the otherextreme of full scale, expressed in terms of percentage of full scale value.

34

USB-2416-4AO User's Guide

Specifications

Throughput rate
The single channel throughput rate is calculated using this formula:
Maximum throughput =1

1+640 µs
data rate

Table 18. Single channel throughput rate specifications

A/D data rate

Maximum throughput (Hz)3750 S/s
2000 S/s
1000 S/s
500 S/s
100 S/s
60 S/s50 S/s25 S/s
10 S/s5 S/s
2.5 S/s

1102.94
877.19609.76378.79
93.98
57.78
48.45
24.61
9.94
4.98
2.50

The multiple-channel throughput rate is calculated using this formula:
Maximum throughput =1

1+640 µs�� �
n datarate

where n is the number of channels.

Table 19. Multiple-channel throughput rate specifications (Hz)
Numberof inputchannels

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

1102.94551.47367.65275.74220.59183.82157.56137.87122.55110.29100.27
91.91
84.84
78.78
73.53
68.93

877.19438.60292.40219.30175.44146.20125.31109.65
97.47
87.72
79.74
73.10
67.48
62.66
58.48
54.82

609.76304.88203.25152.44121.95101.63
87.11
76.22
67.75
60.98
55.43
50.81
46.90
43.55
40.65
38.11

378.79189.39126.26
94.70
75.76
63.13
54.11
47.35
42.09
37.88
34.44
31.57
29.14
27.06
25.25
23.67

93.98
46.99
31.33
23.50
18.80
15.66
13.43
11.75
10.44
9.40
8.54
7.83
7.23
6.71
6.27
5.87

57.78
28.89
19.26
14.45
11.56
9.63
8.25
7.22
6.42
5.78
5.25
4.82
4.44
4.13
3.85
3.61

48.45
24.22
16.15
12.11
9.69
8.07
6.92
6.06
5.38
4.84
4.40
4.04
3.73
3.46
3.23
3.03

24.61
12.30
8.20
6.15
4.92
4.10
3.52
3.08
2.73
2.46
2.24
2.05
1.89
1.76
1.64
1.54

9.94
4.97
3.31
2.48
1.99
1.66
1.42
1.24
1.10
0.99
0.90
0.83
0.76
0.71
0.66
0.62

4.98
2.49
1.66
1.25
1.00
0.83
0.71
0.62
0.55
0.50
0.45
0.42
0.38
0.36
0.33
0.31

2.50
1.25
0.83
0.62
0.50
0.42
0.36
0.31
0.28
0.25
0.23
0.21
0.19
0.18
0.17
0.16

35

USB-2416-4AO User's Guide

Specifications

Analog voltage output
Unused VDACx output channels should be left disconnected.
The USB-2416-4AO output voltage level defaults to 0 V whenever the host PC is reset, shut down orsuspended, or if a reset command is issued to the device.
The duration of the output transient depends highly on the enumeration process of the host PC. Typically, theoutput of the USB-2416-4AO is stable after two seconds.
Table 20. Analog voltage output specifications
Parameter

Conditions

Digital-to-analog
converter
Number of channels
Resolution
Output ranges

Specifications
DAC8555

Calibrated
Uncalibrated
Host PC is reset, powered on, suspended or a reset
command is issued to device (refer to the output
transient discussion above)
Initial power on

Output transient

Differential
non-linearity
Output current
Output short-circuit
protection
Output coupling
VDACx readback

Duration: 50 ms
Amplitude: 5 V peak
±0.25 LSB typ±1 LSB max±3.5 mA max
Unlimited duration

VDACx pins
VDACx connected to AGND

Power on and reset
state
Output noise
Settling timeSlew rate
Throughput

4
16 bits±10 V±10.05 V, software configurable
Duration: 2 s
Amplitude: 2 V p-p

DCEach VDACx output can be
independently measured by the onboard
A/D converter.
Software selectable
DACs cleared to zero-scale: 0 V,
±50 mV
30 µVrms
45 µs
1.0 V/µs
1000 S/s max, system-dependent
1000 S/s / #ch max, system-dependent

To rated accuracy, 10 V step
Single-channel
Multi-channel

Table 21. Calibrated absolute accuracy specifications
Range

Accuracy (±LSB)

±10 V

16.0
Table 22. Calibrated absolute accuracy components specifications

Range% of reading

Offset (±mV)

Temp drift (%/°C)

Absolute accuracy at FS (±mV)±10 V±0.01831.831

0.00055

3.661

Table 23. Relative accuracy specifications
Range

Relative accuracy (±LSB)±10 V

4.0 typ36

USB-2416-4AO User's Guide

Specifications

Analog input/output calibration
Table 24. Analog input/output calibration specifications
Parameter

Specifications

Recommended warm-up time
Calibration
Calibration interval
Calibration reference

45 minutes min
Firmware calibration
1 year
+10.000 V, ±5 mV max. Actual measured values stored in EEPROM
Tempco: 5 ppm/°C max
Long term stability: 30 ppm/1000 hours

Digital input/output
Table 25. Digital input specifications
Number of I/O
Configuration
Input voltage range
Input type
Input characteristics
Maximum input voltage range
Pull-up/pull-down
configuration
Transfer rate (software paced)
Input high voltage
Input low voltage
Schmitt trigger hysteresis
Note 2:

8 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits can be read at any time whether the DOUT is active or tri-stated.
0 to +15 V
CMOS (Schmitt trigger)
47 kΩ pull-up/pull-down resistor, 28 kΩ series resistor
0 to +20 V max (power on/off, relative to DGND pins 93 and 94)
All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Pull down capability is available by placing the JP1 shorting block across pins 2 and 3.
500 port reads or single bit reads per second typ.
1.3 V min, 2.2 V max
1.5 V max, 0.6 V min
0.4 V min, 1.2 V max

DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and
GND pins are common and are isolated from earth ground.
Table 26. Digital output specifications

Number of I/O
Configuration
Output characteristics
Pull-up configuration
Transfer rate (software paced)
Output voltage range
Drain to source breakdown
voltage
Off state leakage current(Note 6)
Sink current capability

8 channels
Each DIO bit can be independently read from (DIN) or written to (DOUT).
The DIN bits may be read at any time whether the DOUT is active or tri-stated47 kΩ pull-up, open drain (DMOS transistor)
All pins pulled up to +5 V via individual 47 kΩ resistors (the JP1 shorting block
default position is pins 1 and 2).
Digital output – 500 port writes or single-bit writes per second typ.
0 to +5 V (no external pull up resistor, internal 47 kΩ pull-up resistors connected to+5 V by default)
0 to +15 V max (Note 5)+50 V min
0.1 µA
150 mA max (continuous) per output pin
150 mA max (continuous) for all eight channels
4ΩDMOS transistor on-resistance(drain to source)
Note 3:Note 4:Each DMOS transistor’s source pin is internally connected to GND.
DGND pins (pins 93, 94) are recommended for use with digital input and digital output pins. The DGND and
GND pins are common and are isolated from earth ground.

37

USB-2416-4AO User's Guide

Note 5:Note 6:

Specifications

The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding an
external pull-up resistor connects it in parallel with the internal 47 kΩ pull-up resistor of that particular digital
input/output bit. Careful consideration should be made when considering the external pull-up resistor value andthe resultant pull-up voltage produced at the load.
Does not include the additional leakage current contribution that may occur when using an external pull-up
resistor.

CounterTable 27. CTR specifications
Parameter

Conditions

Specification

Pin name
Number of channels
Resolution
Counter type
Input type
Input source
Counter read/writes rates(software paced)
Input characteristics

Counter readCounter write
Each CTRx input pin

Input voltage range
Maximum input voltage range

CTR0,CTR1 relative to GND and
DGND pins

Input high voltage
Input low voltage
Schmitt trigger hysteresis
Input bandwidth (-3 dB)
Input capacitance
Input leakage current
Input frequency
High pulse width
Low pulse width
Note 7:

CTR0, CTR1
2 channels
32-bits
Event counter
Schmitt trigger, rising edge triggered
CTR0 (pin 43)
CTR1 (pin 45)
System dependent, 500 reads per second.
System dependent, 500 writes per second.
562 KΩ pull-up resistor to +5 V, 10 kΩ series
resistor±15 V max
±20 V max (power on/off)
1.3 V min, 2.2 V max
1.5 V max, 0.6 V min
0.4 V min, 1.2 V max
1 MHz
25 pf
±120 nA
1 MHz, max
500 ns, min
500 ns, min

The DGND and GND pins are common and isolated from earth ground.

MemoryTable 28. Memory specifications
EEPROM

4096 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use

Microcontroller
Table 29. Microcontroller specifications
Type

One high-performance 8-bit RISC microcontroller with USB interface (non-isolated)
One high-performance 16-bit RISC microcontroller for measurements (isolated)38

USB-2416-4AO User's Guide

Specifications

Power
The USB-2416-4AO product includes an AC power adapter (MCC part number PS-5V2AEPS).
Table 30. Power specifications
Parameter

Conditions

Specification

Supply current (Note 8)External power input (Note 9)External power supply

Quiescent current

Voltage supervisor limits

4.5 V > Vext or Vext > 5.5 V+5 V user output voltage range

4.5 V < Vext < 5.5 V
Available at terminal block pin 35

User +5V user output current

Available at terminal block pin 35

340 mA+5 V, ±5%+5 VDC, 10 W, 5%
regulationPWR LED = Off;(power fault)
PWR LED = On
4.9 V min to 5.1 V
max
10 mA max

Isolation

Measurement system to PC

500 VDC min

MCC p/n PS-5V2AEPS (included)

Table 31. AC power requirements
Parameter

Conditions

Specification

Output voltage
Output wattage
Power jack configuration
Power jack barrel diameter
Power jack pin diameter
Power jack polarity+5 V, ±5%10 watts
Two conductor
6.3 mm
2.0 mmCenter positive

Note 8:This is the total quiescent current requirement for the USB-2416-4AO which includes up to 10 mA for the
status LED. This does not include any potential loading of the digital I/O bits, +5V user terminal or the VDACx
outputs

Note 9:This specification applies to the actual voltage level at the input to the external power connector.

USB specifications
Table 32. USB specifications
USB device type
Device compatibility
USB cable type
USB cable length

USB 2.0 (full-speed)
USB 1.1, USB 2.0
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
5 meters max

Environmental
These environmental specifications apply only to the USB-2416-4AO and not to the AC power adapter.
Table 33. Environmental specifications
Operating temperature range
Storage temperature range
Humidity

0 to 50 °C max-40 to 85 °C max
0 to 90% non-condensing max

39USB-2416-4AO User's Guide

Specifications

Mechanical
Table 34. Mechanical specifications
Dimensions
User connection length

245 mm (L) x 146 mm (W) x 50 mm (H)
5 meters max

Screw terminal connector type and pinout
Table 35. Screw terminal connector specifications
Connector type
Wire gauge range

Detachable screw terminal
16 AWG to 30 AWG

Screw terminal pinout
For additional channel configurations when using the optional AI-EXP expansion device, refer to the "Optional
AI-EXP32 expansion module" section on page 43.

40

USB-2416-4AO User's Guide

Specifications

Table 36. 16-channel differential mode pinout

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Signal name
NC
CH0H
CH0L
NC
NC
CH1H
CH1L
NC
NC
CH2H
CH2L
NC
NC
CH3H
CH3L
NC
NC
GND
CH4H
CH4L
NC
NC
CH5H
CH5L
NC
NC
CH6H
CH6L
NC
NC
CH7H
CH7L
NC
NC
+5V
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
NC

Pin description
No connect
Channel 0 HI
Channel 0 LO
No connect
No connect
Channel 1 HI
Channel 1 LO
No connect
No connect
Channel 2 HI
Channel 2 LO
No connect
No connect
Channel 3 HI
Channel 3 LO
No connect
No connect
Analog ground
Channel 4 HI
Channel 4 LO
No connect
No connect
Channel 5 HI
Channel 5 LO
No connect
No connect
Channel 6 HI
Channel 6 LO
No connect
No connect
Channel 7 HI
Channel 7 LO
No connect
No connect+5V output
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog groundNo connect
No connect

Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96

41

Signal name
NC
CH15L
CH15H
NC
NC
CH14L
CH14H
NC
NC
CH13L
CH13H
NC
NC
CH12L
CH12H
NC
NC
GND
CH11L
CH11H
NC
NC
CH10L
CH10H
NC
NC
CH9L
CH9H
NC
NC
CH8L
CH8H
GND
NC
NC
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC

Pin description
No connect
Channel 15 LO
Channel 15 HI
No connect
No connect
Channel 14 LO
Channel 14 HI
No connect
No connect
Channel 13 LO
Channel 13 HI
No connect
No connect
Channel 12 LO
Channel 12 HI
No connect
No connect
Analog ground
Channel 11 LO
Channel 11 HI
No connect
No connect
Channel 10 LO
Channel 10 HI
No connect
No connect
Channel 9 LO
Channel 9 HI
No connect
No connect
Channel 8 LO
Channel 8 HI
Analog groundNo connect
No connect
Analog ground
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O groundNo connect
No connect

USB-2416-4AO User's Guide

Specifications

Table 37. 32-channel single-ended mode pinout

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Signal name
NC
CH0H
CH0L
NC
NC
CH1H
CH1L
NC
NC
CH2H
CH2L
NC
NC
CH3H
CH3L
NC
NC
GND
CH4H
CH4L
NC
NC
CH5H
CH5L
NC
NC
CH6H
CH6L
NC
NC
CH7H
CH7L
NC
NC
+5V
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
NC

Pin description
No connect
Channel 0
Channel 16
No connect
No connect
Channel 1
Channel 17
No connect
No connect
Channel 2
Channel 18
No connect
No connect
Channel 3
Channel 19
No connect
No connect
Analog ground
Channel 4
Channel 20
No connect
No connect
Channel 5
Channel 21
No connect
No connect
Channel 6
Channel 22
No connect
No connect
Channel 7
Channel 23
No connect
No connect+5V output
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog groundNo connect
No connect

Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96

42

Signal name
NC
CH15L
CH15H
NC
NC
CH14L
CH14H
NC
NC
CH13L
CH13H
NC
NC
CH12L
CH12H
NC
NC
GND
CH11L
CH11H
NC
NC
CH10L
CH10H
NC
NC
CH9L
CH9H
NC
NC
CH8L
CH8H
GND
NC
NC
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC

Pin description
No connect
Channel 31
Channel 15
No connect
No connect
Channel 30
Channel 14
No connect
No connect
Channel 29
Channel 13
No connect
No connect
Channel 28
Channel 12
No connect
No connect
Analog ground
Channel 27
Channel 11
No connect
No connect
Channel 26
Channel 10
No connect
No connect
Channel 25
Channel 9
No connect
No connect
Channel 24
Channel 8
Analog groundNo connect
No connect
Analog ground
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O groundNo connect
No connect

USB-2416-4AO User's Guide

Specifications

Optional AI-EXP32 expansion module
Use the AI-EXP32 (sold separately) for applications that need additional analog/thermocouple input and digital
I/O channels. See Measurement Computing web site for product details.
The AI-EXP32 expansion port is intended to interface with a USB-2416 series product. Do not try to use any ofthe expansion port pins for any other purpose.
Table 38. AI-EXP32 37-pin connector pinout

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

Signal name
GND
NC
GND
NC
GND
VCC
NC
NC
IM_A2
IM_A1
IM_A0
IMEN10
IMEN9
IMEN8
IMEN7
DIO_LOAD2
DIO_LOAD1
NC
NC+3.3V_ISO
GND+5 VA+20.5V
GND-20.5VVDD_ISO
EXTDIO_INT
CM_A3
SM_A1
SM_AO
CM_A2
SCL
SDA
MOSI
SCK
NC
NC

Pin description
Analog groundNo connect
Analog groundNo connect
Analog ground+12 V power
No connect
No connect
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
No connect
No connect+3.3 V power
Analog ground+5 V analog power+20.5 V power
Analog ground-20.5 V power+5 V digital power
I/O control signal
I/O control signal
I/O control signal
I/O control signal
I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
Serial I/O control signal
No connect
No connect

The multiple-channel throughput rate calculation is based on the following formula:
Maximum throughput =1, where n is the number of channels

1+ 640μs)
data rate∑n(

Table 39. Multiple-channel throughput rate specifications (Hz),43USB-2416-4AO User's Guide

Specifications

USB-2416-4AO and optional AI-EXP32 expansion module
Numberof inputchannels

3750 S/s

2000 S/s

1000 S/s

500 S/s

100 S/s

60 S/s50 S/s25 S/s

10 S/s5 S/s

2.5 S/s

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

1102.94551.47367.65275.74220.59183.82157.56137.87122.55110.29100.27
91.91
84.84
78.78
73.53
68.93

877.19438.60292.40219.30175.44146.20125.31109.65
97.47
87.72
79.74
73.10
67.48
62.66
58.48
54.82

609.76304.88203.25152.44121.95101.63
87.11
76.22
67.75
60.98
55.43
50.81
46.90
43.55
40.65
38.11

378.79189.39126.26
94.70
75.76
63.13
54.11
47.35
42.09
37.88
34.44
31.57
29.14
27.06
25.25
23.67

93.98
46.99
31.33
23.50
18.80
15.66
13.43
11.75
10.44
9.40
8.54
7.83
7.23
6.71
6.27
5.87

57.78
28.89
19.26
14.45
11.56
9.63
8.25
7.22
6.42
5.78
5.25
4.82
4.44
4.13
3.85
3.61

48.45
24.22
16.15
12.11
9.69
8.07
6.92
6.06
5.38
4.84
4.40
4.04
3.73
3.46
3.23
3.03

24.61
12.30
8.20
6.15
4.92
4.10
3.52
3.08
2.73
2.46
2.24
2.05
1.89
1.76
1.64
1.54

9.94
4.97
3.31
2.48
1.99
1.66
1.42
1.24
1.10
0.99
0.90
0.83
0.76
0.71
0.66
0.62

4.98
2.49
1.66
1.25
1.00
0.83
0.71
0.62
0.55
0.50
0.45
0.42
0.38
0.36
0.33
0.31

2.50
1.25
0.83
0.62
0.50
0.42
0.36
0.31
0.28
0.25
0.23
0.21
0.19
0.18
0.17
0.16

17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

64.88
61.27
58.05
55.15
52.52
50.13
47.95
45.96
44.12
42.42
40.85
39.39
38.03
36.76
35.58
34.47

51.60
48.73
46.17
43.86
41.77
39.87
38.14
36.55
35.09
33.74
32.49
31.33
30.25
29.24
28.30
27.41

35.87
33.88
32.09
30.49
29.04
27.72
26.51
25.41
24.39
23.45
22.58
21.78
21.03
20.33
19.67
19.05

22.28
21.04
19.94
18.94
18.04
17.22
16.47
15.78
15.15
14.57
14.03
13.53
13.06
12.63
12.22
11.84

5.53
5.22
4.95
4.70
4.48
4.27
4.09
3.92
3.76
3.61
3.48
3.36
3.24
3.13
3.03
2.94

3.40
3.21
3.04
2.89
2.75
2.63
2.51
2.41
2.31
2.22
2.14
2.06
1.99
1.93
1.86
1.81

2.85
2.69
2.55
2.42
2.31
2.20
2.11
2.02
1.94
1.86
1.79
1.73
1.67
1.61
1.56
1.51

1.45
1.37
1.30
1.23
1.17
1.12
1.07
1.03
0.98
0.95
0.91
0.88
0.85
0.82
0.79
0.77

0.58
0.55
0.52
0.50
0.47
0.45
0.43
0.41
0.40
0.38
0.37
0.35
0.34
0.33
0.32
0.31

0.29
0.28
0.26
0.25
0.24
0.23
0.22
0.21
0.20
0.19
0.18
0.18
0.17
0.17
0.16
0.16

0.15
0.14
0.13
0.12
0.12
0.11
0.11
0.10
0.10
0.10
0.09
0.09
0.09
0.08
0.08
0.08

44

USB-2416-4AO User's Guide

Specifications

AI-EXP32 screw terminal pinout
Table 40. 32-channel differential mode pinout

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
GND
+5VUSER
NC
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGND
NC
NC

Pin description
Channel 16 HI
Channel 16 LO
Channel 17 HI
Channel 17 LO
Channel 18 HI
Channel 18 LO
Channel 19 HI
Channel 19 LO
Channel 20 HI
Channel 20 LO
Channel 21 HI
Channel 21 LO
Channel 22 HI
Channel 22 LO
Channel 23 HI
Channel 23 LO
Analog ground
Analog ground+5V output
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

45

Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
GND
NC
NC
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NC
NC

Pin description
Channel 31 LO
Channel 31 HI
Channel 30 LO
Channel 30 HI
Channel 29 LO
Channel 29 HI
Channel 28 LO
Channel 28 HI
Channel 27 LO
Channel 27 HI
Channel 26 LO
Channel 26 HI
Channel 25 LO
Channel 25 HI
Channel 24 LO
Channel 24 HI
Analog ground
Analog groundNo connect
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

USB-2416-4AO User's Guide

Specifications

Table 41. 32-channel single-ended mode pinout

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

Signal name
CH16H
CH16L
CH17H
CH17L
CH18H
CH18L
CH19H
CH19L
CH20H
CH20L
CH21H
CH21L
CH22H
CH22L
CH23H
CH23L
GND
GND
+5VUSER
NC
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
DGND
DGND
NC
NC

Pin description
Channel 16
Channel 48
Channel 17
Channel 49
Channel 18
Channel 50
Channel 19
Channel 51
Channel 20
Channel 52
Channel 21
Channel 53
Channel 22
Channel 54
Channel 23
Channel 55
Analog ground
Analog ground+5V output
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

Pin
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
69
70
71
72
73
74
75
76
61
62
63
64

46

Signal name
CH31L
CH31H
CH30L
CH30H
CH29L
CH29H
CH28L
CH28H
CH27L
CH27H
CH26L
CH26H
CH25L
CH25H
CH24L
CH24H
GND
GND
NC
NC
DIO23
DIO22
DIO21
DIO20
DIO19
DIO18
DIO17
DIO16
DGND
DGND
NC
NC

Pin description
Channel 63
Channel 31
Channel 62
Channel 30
Channel 61
Channel 29
Channel 60
Channel 28
Channel 59
Channel 27
Channel 58
Channel 26
Channel 57
Channel 25
Channel 56
Channel 24
Analog ground
Analog groundNo connect
No connect
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital ground
Digital groundNo connect
No connect

USB-2416-4AO User's Guide

Specifications

USB-2416-4AO screw terminal pinout (with AI-EXP32 attached)
Table 42. USB-2416-4AO single-ended mode pinout with AI-EXP32 connected

Do not connect to terminal block pins labeled "NC."
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Signal name
NC
CH0H
CH0L
NC
NC
CH1H
CH1L
NC
NC
CH2H
CH2L
NC
NC
CH3H
CH3L
NC
NC
GND
CH4H
CH4L
NC
NC
CH5H
CH5L
NC
NC
CH6H
CH6L
NC
NC
CH7H
CH7L
NC
NC
+5V
GND
VDAC0
VDAC1
GND
VDAC2
VDAC3
GND
CTR0
GND
CTR1
GND
NC
NC

Pin description
No connect
Channel 0
Channel 32
No connect
No connect
Channel 1
Channel 33
No connect
No connect
Channel 2
Channel 34
No connect
No connect
Channel 3
Channel 35
No connect
No connect
Analog ground
Channel 4
Channel 36
No connect
No connect
Channel 5
Channel 37
No connect
No connect
Channel 6
Channel 38
No connect
No connect
Channel 7
Channel 39
No connect
No connect+5V output
Analog ground
Analog output Ch0
Analog output Ch1
Analog ground
Analog output Ch2
Analog output Ch3
Analog ground
Counter input Ch0
Analog ground
Counter input Ch1
Analog groundNo connect
No connect

Pin
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96

47

Signal name
NC
CH15L
CH15H
NC
NC
CH14L
CH14H
NC
NC
CH13L
CH13H
NC
NC
CH12L
CH12H
NC
NC
GND
CH11L
CH11H
NC
NC
CH10L
CH10H
NC
NC
CH9L
CH9H
NC
NC
CH8L
CH8H
GND
NC
NC
GND
DIO7
DIO6
DIO5
DIO4
DIO3
DIO2
DIO1
DIO0
DGND
DGND
NC
NC

Pin description
No connect
Channel 47
Channel 15
No connect
No connect
Channel 46
Channel 14
No connect
No connect
Channel 45
Channel 13
No connect
No connect
Channel 44
Channel 12
No connect
No connect
Analog ground
Channel 43
Channel 11
No connect
No connect
Channel 42
Channel 10
No connect
No connect
Channel 41
Channel 9
No connect
No connect
Channel 40
Channel 8
Analog groundNo connect
No connect
Analog ground
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital input/output
Digital I/O ground
Digital I/O groundNo connect
No connect

EU Declaration of Conformity
According to ISO/IEC 17050-1:2010
Manufacturer:
Address:

Product Category:
Date and Place of Issue:
Test Report Number:

Measurement Computing Corporation
10 Commerce Way
Norton, MA 02766
USAElectrical equipment for measurement, control and laboratory use.
October 16, 2017, Norton, Massachusetts USA
EMI5075.08 / EMI5271.09

Measurement Computing Corporation declares under sole responsibility that the productUSB-2416-4AO
is in conformity with the relevant Union Harmonization Legislation and complies with the essential
requirements of the following applicable European Directives:
Electromagnetic Compatibility (EMC) Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
RoHS Directive 2011/65/EU
Conformity is assessed in accordance to the following standards:
EMC:
Emissions: EN 61326-1:2013 (IEC 61326-1:2012), Class A
 EN 55011: 2009 + A1:2010 (IEC CISPR 11:2009 + A1:2010), Group 1, Class A
Immunity: EN 61326-1:2013 (IEC 61326-1:2012), Controlled EM Environments EN 61000-4-2:2008 (IEC 61000-4-2:2008)
 EN 61000-4-3 :2010 (IEC61000-4-3:2010)
Safety: EN 61010-1:2010 (IEC 61010-1:2010)
Environmental Affairs:
Articles manufactured on or after the Date of Issue of this Declaration of Conformity do not contain any of therestricted substances in concentrations/applications not permitted by the RoHS Directive.

Carl Haapaoja, Director of Quality Assurance

Measurement Computing Corporation
10 Commerce Way
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com

NI Hungary Kft
H-4031 Debrecen, Hátar út 1/A, Hungary
Phone: +36 (52) 515400
Fax: +36 (52) 515414
http://hungary.ni.com/debrecen