USB-2404 Series
24-Bit Devices for Voltage, Temperature, or Bridge-Based Sensors
Features• Four analog inputs• 24-bit resolution• simultaneous sampling• Voltage measurements from±125 mV to ±60 V
The USB-2404-UI provides four isolated,
simultaneous analog inputs with support
for voltage, current, thermocouples, RTDs,
resistance, and bridge-based sensors.

The USB-2404-10 and USB-2404-60 (above)
provide four isolated, 24-bit simultaneous
sampling analog inputs supporting ±10 V
or ±60 V voltage ranges• USB-2404-UI also measurescurrent, thermocouples, RTDs,
resistance, and bridge-based
sensors• Cold junction compensation(CJC)• 250 Vrms ch-ch and ch-gnd
isolation

Overview
The USB-2404-10 and USB-2404-60 are designed for both high-speed and accuracy.
Their resolution, sample rate, and input range make them ideal general-purpose
analog input devices. The USB-2404-UI is designed for multipurpose testing, andcan measure several signals from different sensors such as RTDs, thermocouples,
load cells, and other powered sensors.

• Anti-alias filter (USB-2404-10
and USB-2404-60)• Detachable screw terminals• No external power required

All USB-2404 Series devices include channel-to-channel isolation to protect theentire system from harmful voltage spikes and to eliminate measurement errors
caused by ground loops.

Supported Operating Systems• Windows 11/10/8/7/
Vista® 32/64-bit

Analog Input
Each USB-2404 Series device provides
simultaneous sampling of four analog
inputs, and 250 Vrms channel-to-channel
and channel-to-ground isolation.
All devices can connect to either groundreferenced or floating signal sources.

USB-2404-UIThe USB-2404-UI provides four individually configurable channels of 24-bit
universal analog input with integrated
signal conditioning. All channels aremeasured simultaneously at up to 100 S/s
per channel.

The USB-2404-UI can perform the following measurements:•

Voltage•

Current•

Thermocouple•

RTD (4-wire and 3-wire)•

Resistance (4-wire and 2-wire)•

Bridge-based sensors (quarter-, half-,
and full-bridge)

The USB-2404-UI features built-in current
and voltage excitation. The excitation
circuit is protected from overcurrent
and overvoltage fault conditions. The
USB-2404-UI supports class II TEDS smart
sensors, and includes a built-in thermistor
for cold-junction compensation (CJC).
An analog pre-filter removes noise that
may be present in the signals prior toconversion.

Measurement ranges vary for each typeof measurement.

USB-2404 Series Selection Chart
Model

Analog Inputs

Sample Rate
Per Channel

Measurement Types

Voltage Ranges

Isolation*

Anti-Alias
FilterUSB-2404-10

4

Up to 50 kS/s

Voltage

±10 V

✔

✔

USB-2404-60

4Up to 50 kS/s

Voltage

±60 V

✔

✔

USB-2404-UI

4

Up to 100 S/s

Voltage, Current,Thermocouples,
RTDs, Resistance, andBridge‑Based Sensors±60 V, ±15 V,±4 V, ±1 V,±125 mV✔

–* 250 Vrms channel-to-channel and channel-to-ground

Measurement Computing(508) 946-5100

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USB-2404 Series
Features
Timing Options•

Stopband bandwidth: The filter significantly attenuates
all signals above the stopband frequency (0.547 · ƒS, whereƒS is the sample rate). The filter is used primarily to prevent aliasing, so the stopband frequency scales precisely
with the sample rate.
The stopband rejection (100 dB) is the minimum amountof attenuation applied by the filter to all signals with frequencies within the stopband bandwidth.

•

Alias-Free bandwidth: Signals that appear in the alias-freebandwidth these devices are not aliased artifacts of signals
at a higher frequency. The alias-free bandwidth (0.453 · ƒS)
is defined by the ability of the filter to reject frequencies
above the stopband frequency. The alias-free bandwidth
equals the sample rate minus the stopband frequency.

The following timing options are supported. Each option is
optimized for different types of applications by using different
ADC conversion times.
•

High Speed – Optimized for high-speed applications at
the expense of noise rejection.

•

Best 60 Hz Rejection – Optimized for rejection of 60 Hz
noise.

•

Best 50 Hz Rejection – Optimized for rejection of 50 Hz
noise.

•High Resolution – Optimized for maximum overall noise
rejection, and provides a good rejection of both 50 Hz and
60 Hz noise.

Refer to the analog input specifications for the conversion timeand rejection ratio of each option.

Terminal Connectors

Each channel has a 2-position detachable screw terminal for fieldwiring connections. Ten additional two-position connectors areavailable with the optional ACC-102 connector kit.

Terminal Connectors

Each channel has a 6-position detachable spring connector forfield wiring connections. Four additional six-position connectors
are available with the optional ACC-164 connector kit.

High-Voltage Applications
For high-voltage applications with the USB-2404-10 or theUSB-2404-60, MCC recommends using the ACC-160 backshell
to ensure that the terminals are not accessible. The backshell
also provides strain relief to protect the USB-2404-10/2404-60
screw terminals

USB-2404-10 and USB-2404-60
The USB-2404-10 and the USB-2404-60 each provide four channels of 24-bit simultaneous analog inputs and a sampling rateof 50 kS/s per channel, maximum. A master timebase frequency
controls the sample rate. The input voltage range is ±10 V for
the USB-2404-10, and ±60 V, for the USB-2404-60.

For high-voltage applications with the USB-2404-UI, MCC
recommends using the ACC-176 backshell to ensure that theterminals are not accessible.

Anti-Alias Filtering

The anti-alias filter removes noise that may be present in thesignals prior to conversion. These devices combine analog anddigital filtering to accurately represent in-band signals while
rejecting out-of-band signals. The filters discriminate between
signals based on the frequency range, or bandwidth, of the signal.
The passband, stopband, and alias-free bandwidths are important.
These devices represent signals within the passband frequency, as
quantified primarily by passband ripple and phase nonlinearity.
All signals within the alias-free bandwidth are either unaliased
signals or signals that have been filtered by at least the amountof the stopband rejection.
•

Passband bandwidth: The signals within the passband
bandwidth have frequency-dependent gain or attenuation.
The small amount of variation in gain with respect to frequency is the passband flatness. The device's digital filters
adjust the frequency range of the passband to match thedata rate, so, the amount of gain or attenuation at a given
frequency depends on the sample rate.

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USB-2404 Series
Software
Software Support
The USB-2404 Series is supported by the software in the table below.
Ready-to-Run Applications

InstaCal™

TracerDAQ™ andTracerDAQ Pro

An interactive installation, configuration, and test utility for MCC hardware. Windows OS
InstaCal is included with the free MCC DAQ Software bundle.
Virtual strip chart, oscilloscope, function generator, and rate generator applications used togenerate, acquire, analyze, display, and export data. Supported features may vary by hardware.
The Pro version provides enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle.
TracerDAQ Pro is available as a purchased software download.

General-Purpose Programming Support
Universal Library™
(UL) for Windows

Library for developing applications in C, C++, VB, C# .Net, VB .Net, and Python on Windows.
The UL for Windows is included with the free MCC DAQ Software bundle.
The UL Python API for Windows is available on GitHub (github.com/mccdaq/mcculw).

Application-Specific Programming Support
ULx forNI LabVIEW™

DASYLab®

Measurement Computing

A comprehensive library of VIs and example programs for NI LabVIEW that is used to develop
custom applications that interact with most MCC devices. Windows OS
ULx for NI LabVIEW is included with the free MCC DAQ Software bundle.
Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming. Windows OS
DASYLab is available as a purchased software download. An evaluation version is available for28 days.

(508) 946-5100

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USB-2404 Series
Functional Diagrams
USB-2404-UI functional diagram
CH0

1
2

TEDS

3
.
.
6

MUX

USB
Isolated
ADC

FilterHi-SpeedUSB 2.0

Isolation Barrier

CH1

1
2

TEDS

3
.
.
6

MUX

CompliantInterface

Isolated
ADC

FilterUSB
Microcontroller

Isolation Barrier

1
2
CH2

3
.
.
6

TEDS

MUX

Isolated
ADC

FilterIsolation Barrier

CH3

1
2

TEDS

3
.
.
6

MUX

Isolated
ADC

FilterIsolation BarrierUSB-2404-10/2404-60 functional diagram
CH0+
CH0-

Overvoltage
Protection+
Amplifier

Isolated
ADC

Isolation Barrier
CH1+
CH1-

Overvoltage
Protection+
AmplifierUSB

Prefilter

Hi-SpeedUSB 2.0
Isolated
ADC

CompliantInterfacePrefilter

Isolation Barrier
CH2+
CH2-

Overvoltage
Protection+
Amplifier

Isolated
ADC
Prefilter

USB
Microcontroller

Isolation Barrier
CH3+
CH3-

Overvoltage
Protection+
AmplifierMeasurement Computing(508) 946-5100

Isolated
ADC
Prefilter4

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USB-2404 SeriesSpecifications (USB-2404-UI)
Specifications

Accuracy

All specifications are subject to change without notice.
Typical for the range 0 °C to 60 °C unless otherwise noted.
All voltages are relative to the CH– signal on each channel unless otherwise noted.

Mode, Range

Gain Error(% of Reading)

Offset Error(PPM of Range)

25 ºC, ±5 ºC Typical, –40 ºC to 70 ºC
MaximumUSB-2404-UI
Analog Input

Number Of Channels: 4
A/D Converter Resolution: 24-bit
A/D Converter Type: Delta-Sigma with analog pre-filtering
Sampling Mode: Simultaneous
TEDS Sensor Type Supported: IEEE 1451.4 TEDS Class II (interface)
Input Modes: Voltage, current, resistance (4-wire and 2-wire), RTD (3-wire and4-wire), thermocouple, quarter-bridge, half-bridge, full-bridge
Conversion Time (No Channels in TC Mode)High Speed: 10 ms for all channels
Best 60 Hz Rejection: 110 ms for all channels
Best 50 Hz Rejection: 130 ms for all channels
High Resolution: 500 ms for all channels
Conversion Time (One Or More Channels In TC Mode)High Speed: 20 ms for all channels
Best 60 Hz Rejection: 120 ms for all channels
Best 50 Hz Rejection: 140 ms for all channels
High Resolution: 510 ms for all channels
Overvoltage Protection
Terminals 1 and 2: ±30 V
Terminals 3 Through 6, Across Any Combination: ±60 V
Input Impedance
Voltage Mode (±60 V, ±15 V, ±4 V): 1 MΩ
Current Mode: <40 Ω
All Other Modes: >1 GΩ
Input Bias Current: <1 nA
Integral Non-Linearity (INL): ±15 ppm
Common Mode Rejection Ratio (ƒin= 60 Hz): >100 dB
Rejection: 90 dB at 60 Hz
Best 50 Hz Rejection: 80 dB at 50 Hz
High Resolution: 65 dB at 50 Hz and 60 Hz

Nominal Ranges

Actual Ranges

Voltage±60 V, ±15 V, ±4 V,±1 V, ±125 mV±60 V, ±15 V, ±4 V,±1 V, ±125 mV

Current±25 mA±25 mA

4- and 2-Wire
Resistance

10 kΩ, 1 kΩ

10.5 kΩ, 1.05 kΩ

Thermocouple±125 mV±125 mV

4- and 3-Wire RTD

Pt 1000, Pt 100

5.05 kΩ, 505 Ω

Quarter-Bridge

350 Ω, 120 Ω

390 Ω, 150 Ω

Half-Bridge±500 mV/V±500 mV/V

Full-Bridge±62.5 mV/V,±7.8 mV/V±62.5 mV/V,±7.8125 mV/V

Measurement Computing(508) 946-5100±0.3, ±0.4±20, ±50±0.3, ±0.4±60, ±180

Voltage, ±4 V

±0.3, ±0.4±240, ±720

Voltage, ±1 V
Voltage/Thermocouple,±125 mV
Current, ±25 mA
4- and 2-Wire* Resistance,
10 kΩ
4- and 2-Wire* Resistance,
1 kΩ±0.1, ±0.18±15, ±45±0.1, ±0.18±120, ±360±0.1, ±0.6±30, ±100±0.1, ±0.5±120, ±320±0.1, ±0.5±1200, ±3200

4- and 3-Wire RTD, Pt 1000

±0.1, ±0.5±240, ±640

4- and 3-Wire RTD, Pt 100±0.1, ±0.5±2400, ±6400

Quarter-Bridge, 350 Ω±0.1, ±0.5±2400, ±6400±2400, ±6400

Quarter-Bridge, 120 Ω±0.1, ±0.5

Half-Bridge, ±500 mV/V

±0.03, ±0.07±300, ±450

Full-Bridge, ±62.5 mV/V

±0.03, ±0.08±300, ±1000

Full-Bridge, ±7.8 mV/V

±0.03, ±0.08±2200, ±8000

CJC Sensor Accuracy

N/A±1 ºC, typical* 2-Wire resistance mode accuracy depends on the lead wire resistance. This table
assumes 0 Ω of lead wire resistance.

Stability

Input Mode Ranges
Input Mode

Voltage, ±60 V
Voltage, ±15 V

5Measurement Conditions

Gain Drift (PPMof Reading/ ºC)

Offset Drift(PPM ofRange/ºC)

Voltage, ±60 V

±20

±0.2

Voltage, ±15 V

±20

±0.8

Voltage, ±4 V

±20

±3.2

Voltage, ±1 V
Voltage/Thermocouple,±125 mV

±10

±0.2

±10

±1.6

Current, ±25 mA
4- and 2-Wire Resistance,
10 kΩ
4- and 2-Wire Resistance,
1 kΩ
4- and 3-Wire RTD,
Pt 1000
4- and 3-Wire RTD,
Pt 100Quarter-Bridge, 350 Ω

±15

±0.4

±15

±3

±15

±30

±15

±6

±15

±60

±15

±120

Quarter-Bridge, 120 Ω

±15

±240

Half-Bridge, ±500 mV/V

±3

±20

Full-Bridge, ±62.5 mV/V

±3

±20

Full-Bridge, ±7.8 mV/V

±3

±20

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USB-2404 SeriesSpecifications (USB-2404-UI)
Resistance, RTD, and Quarter-Bridge Mode Excitation
Level

Half-Bridge and Full-Bridge Mode Excitation Level
Measurement
Conditions
Half-Bridge

Load
Resistance (Ω)
700

Half-Bridge

240

2.0

Full-Bridge

350

2.7

1,000

430

Full-Bridge

120

2.2

10,000

2,200

Excitation (V)Load Resistance (Ω)

Excitation (mV)

2.5

120

50

350

150

Input Noise
Conversion TimeMode, Range

High Speed

Best of 60 Hz Rejection

Best of 50 Hz Rejection

High Resolution

Voltage, ±60 V

7.6

1.3

1.3

0.5

Voltage, ±15 V

10.8

1.9

1.9

0.7

Voltage, ±4 V

10.8

2.7

2.7

1.3

Voltage, ±1 V

7.6

1.3

1.3

0.5

Voltage/Thermocouple, ±125 mV

10.8

1.9

1.9

1.0

Current, ±25 mA

10.8

1.9

1.9

1.0

4- and 2-Wire resistance, 10 kΩ

4.1

1.3

0.8

0.3

4- and 2-Wire resistance, 1 kΩ

7.1

1.8

1.2

0.7

4- and 3-Wire RTD, Pt 1000

7.6

1.7

1.1

0.4

4- and 3-Wire RTD, Pt 100

10.8

1.9

1.9

0.9

Quarter-Bridge, 350 Ω

5.4

1.0

1.0

0.7

Quarter-Bridge, 120 Ω

5.4

1.0

1.0

0.7

Half-Bridge, ±500 mV/V

3.8

0.5

0.5

0.2

Full-Bridge, ±62.5 mV/V

5.4

1.0

1.0

0.8

Full-Bridge, ±7.8 mV/V

30

4.7

4.7

2.3

Safety Voltages

Power

Connect only voltages that are within the limits specified below.
Channel-To-Earth Ground Isolation
Continuous: 250 VAC, Measurement Category II
Withstand: 2300 VAC, verified by a 5 second dielectric withstand test
Channel-To-Channel Isolation
Continuous: 250 VAC, Measurement Category II
Withstand:1390 VAC, verified by a 5 second dielectric withstand test
Measurement Category II is for measurements performed on circuits
directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided
by a standard wall outlet, for example 115 V for US or 230 V for Europe.

Current Consumption from USB: 500 mA, max

Bus interface

USB Specification: USB 2.0 Hi-Speed

Environmental

The USB-2404-UI is intended for indoor use only, but may be used outdoors if
installed in a suitable enclosure.
Operating Temperature Range: 0 ºC to 60 ºC
Storage Temperature Range: –40 to 85 ºC
Operating Humidity: 10% to 90% RH, non-condensing
Storage Humidity: 5% to 95% RH, non-condensing
Maximum Altitude: 2000 meter (6562 feet)

Do not connect the device to signals or use for measurements within Measurement Categories III or IV.

MechanicalSpring Terminal Connectors

Dimensions (L × W × H): 134 × 143 × 39 mm (5.27 × 5.64 × 1.54 in.)
Weight:1.25 lbs (567 grams)

Measurement Computing(508) 946-5100

Connector Type: Four 6-position detachable spring terminal connectors
Spring Terminal Wiring: 18 AWG to 28 AWG copper conductor wire with 7 mm
(0.28 in.) of insulation stripped from the end.

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USB-2404 SeriesSpecifications (USB-2404-10/USB-2404-60)
USB-2404-10 and USB-2404-60

Accuracy

Analog Input

Measurement
Conditions

Number Of Channels: 4
A/D Converter Resolution: 24-bit
A/D Converter Type: Delta-Sigma with analog pre-filtering
Sampling Mode: Simultaneous
Sample Rate: 1.613 kS/s to 50 kS/s1
Sample Rates (ƒs): (ƒ ÷ 256) , n = 1, 2, ... 31.
MInternal Master Timebase: Frequency: 12.8 MHz
Accuracy: ±100 ppm maximum
Input Voltage Ranges (CH+ to CH–)
USB-2404-10
		 ±10 V nominal
		 ±10.52 V typ
		±10.3 min
USB-2404-60
		 ±60 V nominal
		 ±62.64 V typ
		 ±61.5 V min
Overvoltage Protection: ±100 V
Input Coupling: DC
Input Impedance (CH+ to CH–): 1 MΩ
Input NoiseUSB-2404-10: 70 µV rms
USB-2404-60: 320 µV rms
Gain Drift: ±5 ppm/ºC
Offset DriftUSB-2404-10: ±24 µV/ºC
USB-2404-60: ±150 µV/ºC
Post Calibration Gain Match (Channel-to- Channel, 20 kHz): 0.22 dB max
Crosstalk (1 kHz): –130 dB
Phase Mismatch (Channel-to-Channel)
USB-2404-10: 0.075º/kHz max
USB-2404-60: 0.045º/kHz max
Phase Nonlinearity (ƒs= 50 kS/s): 0.11º max
Input Delay
USB-2404-10: 38.4 +3 µs
USB-2404-60: 38.4 +2.6 µs
Passband Frequency: 0.453
Passband Flatness (ƒs= 50 kS/s): ±100 mdB max
Stopband Frequency: 0.547 · ƒs
Stopband Rejection: 100 dB
Alias-Free Bandwidth: 0.453 · ƒs
–3 db Pre-Filter Bandwidth (ƒs= 50 kS/s): 24.56 kHz
Common Mode Rejection Ratio (ƒin= 60 Hz):
USB-2404-10: 126 dB
USB-2404-60: 116 dB
Spurious Free Dynamic Range (1 kHz, –60 dBFS): –128 dBFS
Total Harmonic Distortion
1 kHz, –1 dBFS: –99 dB
1 kHz, –20 dBFS:–105 dB±0.13%±0.05%±0.03%±0.008%

Uncalibrated
Maximum(–0 ºC To 60 ºC)

USB-2404-10: ±1.4%
USB-2404-60: ±1.2%

USB-2404-10: ±0.67%
USB-2404-60: ±0.55%

Uncalibrated
Typical(25 ºC, ±5 ºC)±0.3%±0.11%* The USB-2404-10 range equals 10.52 V.
The USB-2404-60 range equals 62.64 V.

Power

Current Consumption from USB: 500 mA, max

Bus Interface

USB Specification: USB 2.0 Hi-Speed mode (480 Mbps) is recommended. Otherwise, USB 1.1 Full Speed mode (12 Mbps)

Environmental

Operating Temperature Range: 0 °C to 60 °C
Storage Temperature Range: –40 °C to 85 °C
Operating Humidity: 10% to 90% relative humidity, non-condensing
Storage Humidity: 5% to 95% relative humidity, non-condensing
Maximum Altitude: 2000 m (6562 feet)
Pollution Degree (IEC60664): 2

Mechanical

Dimensions (L × W × H): 114.30 × 139.7 × 38.1 mm (4.5 × 5.5 × 1.5 in)
Weight: 1.2 lbs. (544 grams)

Safety Voltages

Connect only voltages that are within the limits specified in this table.
Channel-to-Earth Ground Isolation
Continuous: 250 Vrms, Measurement Category II
Measurement Category II is for measurements performed on circuits
directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided
by a standard wall outlet, for example 115 V for US or 230 V for Europe.
Do not connect the device to signals or use for measurements within Measurement Categories III or IV.
Withstand: 2,300 Vrms, verified by a 5 sec dielectric withstand test
Channel-to-Channel Isolation
Continuous: 250 Vrms, Measurement Category II (Note 4)
Withstand: 1390 Vrms, verified by a 5 sec dielectric withstand test

1 Full performance requires connections to a USB 2.0 Hi-Speed host controller
and USB 2.0 high-speed hubs.) The maximum sample rate may be lower on
USB 1.1 ports.

(508) 946-5100

Percent of Range*(Offset Error)

Calibrated
Maximum(–0 ºC To 60 ºC)
Calibrated
Typical(25 ºC, ±5 ºC)nMeasurement Computing

Percent of Reading(Gain Error)

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USB-2404 Series
Ordering
Order Information

Accessories and Cables

HardwarePart No.

Description

USB-2404-UI

24-bit, 100 S/s, simultaneous-sampling DAQ device
with 4 simultaneous analog inputs for voltage,
temperature, and bridge-based sensors; includes USB
cable and MCC DAQ softwareUSB-2404-10

24-bit, 50 kS/s DAQ device with 4 simultaneous
analog inputs ±10 V; includes USB cable and MCC
DAQ softwareUSB-2404-60

24-bit, 50 kS/s DAQ device with 4 simultaneous
analog inputs ±60 V; includes USB cable and MCC
DAQ software

Measurement Computing
USB-2404-Series-data.indd(508) 946-5100

Part No.

Description

ACC-1022-position screw terminal connector kit for theUSB-2404-10 and USB-2404-60 (quantity of 10)

ACC-160

Backshell kit for the USB-2404-10 and USB-2404-60(quantity of 4)

ACC-164

6-position spring terminal connector kit for theUSB-2404-UI (quantity of 4)

ACC-176

Backshell kit for the USB-2404-UI (quantity of 4)

Software also Available from MCC

8Part No.

Description

TracerDAQ Pro

Out-of-the-box virtual instrument suite with strip chart,
oscilloscope, function generator, and rate generator –professional version

DASYLabIcon-based data acquisition, graphics, control, and analysis
softwareinfo@mccdaq.com

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April 2019. Rev 2© Measurement Computing Corporation