BTH-1208LS
Wireless Multifunction DAQ Device

User's Guide

July 2019. Rev 7© 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 BTH-1208LS.docx

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 BTH-1208LS ................................................................................................................ 6
Functional block diagram ................................................................................................................................... 7
Chapter 2

Installing a BTH-1208LS ....................................................................................................................... 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Installing on Bluetooth – pairing with the host device ...................................................................................................... 8
Installing on USB.............................................................................................................................................................. 9

Configuring Bluetooth settings ........................................................................................................................... 9
Calibrating the hardware..................................................................................................................................... 9Updating firmware .............................................................................................................................................. 9
Chapter 3

Functional Details ............................................................................................................................... 10
Analog input acquisition modes ....................................................................................................................... 10
Software paced mode .......................................................................................................................................................10
Hardware paced mode......................................................................................................................................................10
BURSTIO ........................................................................................................................................................................11

Components ...................................................................................................................................................... 11
Screw terminals................................................................................................................................................................12
USB connector .................................................................................................................................................................13
Power/pairing button........................................................................................................................................................13
LEDs ................................................................................................................................................................................14Signals .............................................................................................................................................................. 14
Analog input ....................................................................................................................................................................14
Analog output ..................................................................................................................................................................15
External clock input .........................................................................................................................................................15
Digital I/O ........................................................................................................................................................................15
External pull-up capability ...............................................................................................................................................16
Trigger input ....................................................................................................................................................................16
Counter input ...................................................................................................................................................................17
Ground .............................................................................................................................................................................17
Power output ....................................................................................................................................................................17

Mechanical drawings ........................................................................................................................................ 18
Chapter 4

Specifications ...................................................................................................................................... 20
Analog input ..................................................................................................................................................... 20
Accuracy ..........................................................................................................................................................................21
Noise performance ...........................................................................................................................................................21

Analog output ................................................................................................................................................... 22
Digital input/output........................................................................................................................................... 22External trigger ................................................................................................................................................. 23
External clock input .......................................................................................................................................... 23
Counter ............................................................................................................................................................. 24
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BTH-1208LS User's Guide

Memory ............................................................................................................................................................ 24
Microcontroller ................................................................................................................................................. 24
Power ................................................................................................................................................................ 25
Bluetooth .......................................................................................................................................................... 25
USB .................................................................................................................................................................. 25
Environmental .................................................................................................................................................. 25
Mechanical ....................................................................................................................................................... 26
Signal connector ............................................................................................................................................... 26
EU Declaration of Conformity ............................................................................................................ 27

4

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide describes the Measurement Computing BTH-1208LS wireless 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

Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.

italic text

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 BTH-1208LS is available on our website at www.mccdaq.com. You can also
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Chapter 1

Introducing the BTH-1208LS
The BTH-1208LS is a multifunction data acquisition device that communicates using Bluetooth® wirelesstechnology. The Bluetooth radio host used with the device must support Bluetooth 2.0 or later. The following
Bluetooth stack protocols are supported on Windows:§§

Microsoft Bluetooth stack
Broadcom ® Bluetooth stack (not supported by Windows XP SP3)

The BTH-1208LS is powered by two AA batteries (standard or rechargeable) when in Bluetooth mode or by theUSB host in USB mode; no external power is required. A USB cable is shipped with the device.
The BTH-1208LS provides the following features:
§
§
§
§
§
§
§
§
§
§

Eight 11-bit single-ended (SE) or four 12-bit differential (DIFF) analog input channels
1 kS/s max sample rate in Bluetooth continuous scan mode
47 kS/s sample rate in Bluetooth BURSTIO mode and when communicating over USB connection
Software-selectable analog input ranges of ±10 V (SE), and ±20 V, ±10 V, ±5 V, ±4 V, ±2.5 V, ±2.0 V,±1.25 V, and ±1.0 V (DIFF).
Two 12-bit analog outputs
Eight individually configurable digital I/O channels
One 32-bit event counter
One external digital trigger input
One external clock input
Two screw terminal connectors for field wiring

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BTH-1208LS User's Guide

Introducing the BTH-1208LS

Functional block diagram
BTH-1208LS functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

7

Chapter 2

Installing a BTH-1208LS
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 BTH-1208LS product page on our website for information about
the available software supported by the BTH-1208LS.

Installing the hardware
The BTH-1208LS can run on either a Bluetooth or USB interface.

Installing on Bluetooth – pairing with the host device
Pairing creates a bond between a Bluetooth device and a host device. A host device can be either a Windows
device or an Android device.
The BTH-1208LS must be paired with the host device before it can establish a wireless connection and transmit
acquired data to the device. A BTH-1208LS only has to be paired once with a particular host device.
The BTH-1208LS can be paired or connected when powered by:§§batteries (standard or rechargeable)
an external USB power supply

The BTH-1208LS cannot be paired when powered by a USB host device.
To pair the BTH-1208LS as a Bluetooth device, make sure the device is not connected to a USB host, andcomplete the following steps (refer to Figure 2 on page 11 for the location of device components referenced inthis section):
1.

Make sure the host device is configured to host a Bluetooth device. Refer to the host device documentation
to learn how to enable Bluetooth and how to search for and pair with Bluetooth devices.

2.

If powered by batteries, press and hold the button for at least five seconds to power on the device and put it
into pairing mode.
If powered by a USB power supply, press and hold the button for at least three seconds to put it into pairing
mode.
When the Power and Status LEDs blink alternately, the device is in pairing mode and is ready to pair withthe host device.

3.

Select the Bluetooth device setup in the host device OS software, and then select the BTH-1208LS when it
displays. Refer to the Bluetooth documentation of your host device to learn how to pair it with a Bluetooth
device.
For example, in Windows, select Bluetooth Device from the Control Panel, and then double-click on
BTH-1208LS-xxxx in the Add a device dialog box (xxxx are the last four digits of the device serial
number. You may need to wait a few seconds for the device to display.

4.

If host device requests a passkey, PIN or pairing code, enter the default value for the device (0000).

5.

Press and hold the power/pairing button for two seconds to remove the device from pairing mode.

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BTH-1208LS User's Guide

Installing a BTH-1208LS

Once the BTH-1208LS is paired to the host device, run an application that communicates with the device (suchas InstaCal) to establish a connection. The Status LED turns on to indicate a Bluetooth connection isestablished.
Digital ground to earth ground connection recommended
Measurement Computing recommends that you connect one of the digital grounds (GND) to earth ground to
reduce the chance of the BTH-1208LS unexpectedly powering down due to electrostatic discharge.

Installing on USB
Connect the BTH-1208LS 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.
If the USB LED turns off
If the USB LED turns on but then turns off, the computer has lost communication with the BTH-1208LS. To
restore communication, disconnect the USB cable from the computer, and then reconnect it. This should restore
communication, and the USB LED should turn back on.

Configuring Bluetooth settings
All Bluetooth settings except for the pairing code can be changed when the BTH-1208LS is either physically or
wirelessly connected to the host device. The pairing code can only be changed when the BTH-1208LS is
physically connected to the host device.
You can configure the following Bluetooth settings on the BTH-1208LS through software. For example, if you
are using the device in a Windows environment, you can configure these settings with InstaCal.
§

Pairing code – Four-digit code that identifies the BTH-1208LS to the host device (default = 0000). The§

Bluetooth connection status notifications – You can set values that indicate when the device ispairing code cannot be changed when the BTH-1208LS is connected wirelessly to the host device.

§§connected over Bluetooth, and when the Bluetooth connection terminates. Connected and disconnectedvalues can be set for digital outputs, analog output channel 0, and analog input channel 1
Auto shutdown – When the device is powered by batteries, you can configure the device to power down a
specified amount of time after the Bluetooth connection terminates.
Battery charging – When the device is powered by rechargeable batteries, you can configure the device torecharge batteries from the USB power supply when connected over Bluetooth.

Calibrating the hardware
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.

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
Analog input acquisition modes
The BTH-1208LS can acquire analog input data in three different modes – software paced, hardware paced, and
BURSTIO.

Software paced mode
In software paced mode you can acquire one analog sample at a time. You initiate the A/D conversion bycalling a software command. The analog value is converted to digital and returned to the computer. You repeat
this procedure until you have the total number of samples that you want from one channel.
§§

When communicating over a Bluetooth connection, the typical throughput sample rate in software pacedmode is 10 S/s (system-dependent).
When communicating over a USB connection, the typical throughput sample rate in software paced modeis 250 S/s (system-dependent).

Hardware paced mode
In hardware paced mode you can acquire data from up to eight channels. The analog data is acquired andconverted to digital values until you stop the scan.
§

When communicating over a Bluetooth connection, the maximum sample rate of 1024 S/s is an aggregate
rate. The total acquisition rate for all channels cannot exceed 1024 S/s. The following table lists the sample
rates when scanning from one to eight channels in Bluetooth mode.
Maximum per channel sample rate in Bluetooth mode§

# channels scanned

Sample rate (S/s)

1
2
3
4
5
6
7
8

1024
512
341.33256204.8
170.67146.28128

When communicating over a USB connection, the maximum sample rate of 47 kS/s is an aggregate rate.
The total acquisition rate for all channels cannot exceed 47 kS/s. Data is transferred in blocks of 32 samples
from the device to the memory buffer on your computer.
The following table lists the sample rates when scanning from one to eight channels in USB mode.
Maximum per channel sample rate in USB mode
# channels scanned

Sample rate (kS/s)

1
2
3
4
5
6
7
8

47
23.5
15.67
11.75
9.40
7.83
6.70
5.88

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Functional Details

In both Bluetooth mode and USB mode, you can start a hardware paced scan with either a software command orwith an external hardware trigger event.

BURSTIO
When using BURSTIO, the BTH-1208LS can acquire data at the maximum throughput of 47kS/s whenconnected in Bluetooth mode. BURSTIO doesn’t offer any advantage in USB mode, since these rates aresupported for BLOCKIO in USB mode.
When BURSTIO is enabled, scans are limited to the depth of the onboard memory (12,288 samples), as the datais acquired at a rate faster than it can be transferred to the computer. Keep in mind that when using Bluetooth
the rate of transfer of the acquired data to the host is still limited so the process can take several seconds. Time
must be allowed between scans for the acquisition and the transfer of the data.
The maximum sample rate is an aggregate rate. The total sample rate using BURSTIO is 47 kS/s per channel forany or all channels. An error occurs if you exceed the FIFO capacity and acquire more than 12,288 samples in
BURSTIO mode.

Components
These BTH-1208LS components are shown in Figure 2.
§§§§

Screw terminals
LED status indicators
USB connector
Power/pairing button

1
2

Screw terminals for digital I/O, digital trigger, powerout, clock input, and counter input
Screw terminals for analog input and analog output

3

USB connector

4Power/pairing button

5Power LED (top) and Status
LED (bottom)

Figure 2. Components

11BTH-1208LS User's Guide

Functional Details

Screw terminals
The screw terminals provide the followings:
§
§
§
§
§
§
§
§
§

Eight analog inputs (CH0H/CH0L to CH3H/CH3L)
Two analog outputs (AOUT0 and AOUT1)
Eight digital I/O (DIO0 to DIO7)
One external trigger input (TRIG)
One external counter input (CTR)
One external clock input (AICKI)
One power output (+VO)
Six analog grounds (AGND)
Four digital grounds (GND)

Use 16 AWG to 30 AWG wire when makings to the screw terminals.
The single-ended mode pinout is shown in Figure 3.

Figure 3. Single-ended mode pinout

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Functional Details

The differential mode pinout is shown in Figure 4.

Figure 4. Differential mode pinout

USB connector
The USB connector provides 5 V power when connected to a USB power supply and provides both power andcommunication when the device is connected to a USB port. If rechargeable NiMH batteries are installed,
batteries recharge when the device is connected to a USB host or power supply.

Power/pairing button
The power/pairing button has different functions depending on the power source of the device.
The term pairing refers to one function of the button – to put the device in pairing mode so it can establish an
association between the Bluetooth radio on the host device and the BTH-1208LS radio.
Button functions are listed in the table below.

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Functional Details

Power/pairing button functions
Power Status

Button Functions

Battery powerednPowered by USB charger/USB
power supply

Powered by USB host port orhub

To power on the device, press and hold the button for 3 seconds. To enter pairingmode, hold the button for an additional 2 seconds.
n To remove the device from pairing mode, press and hold the button again for 2
seconds.
n To power off the device when not in pairing mode, press and hold the button for 2
secondsn To put the device in pairing mode when it is powered on, press and hold button for 2
seconds.
n To remove the device from pairing mode, press and hold the button again for
2 seconds.
The power/pairing button is disabled.

LEDs
The Power LED indicates the power status of the device. The Status LED indicates the communication status of
the device.
LEDs cannot be disabled. LED states are listed in the tables below.
Power and Status LED behavior
Power LED

Indication

Steady green
Blinkscontinuously

Off

The device is powered by USB and the batteries are sufficiently charged or not installed.
n If the device is connected to USB port/host, then the batteries are recharging (only if rechargeable
batteries are installed).
n If the device is not connected to USB port, then it is powered by batteries.
n If the Power LED is blinking alternately with the Status LED, then the device is in pairing mode.
Device is off.

Status LED

Indication

Steady green
Blinkscontinuously

Bluetooth or USB connection establishedn Communication with host computer occurring over Bluetooth or USB connection.
n If the Status LED is blinking alternatively with the Power LED, then device is in pairing mode.
A Bluetooth or USB connection is not establishedOff

Signals
Analog input
You can connect up to eight single-ended analog inputs (CH0 to CH7) or four differentials (CH0H/CH0L to
CH3H/CH3L).
Single-ended configuration
When configured for single-ended input mode, eight analog input channels are available. Each analog input has
11-bit resolution (due to restrictions imposed by the A/D converter) and offers a ±10 V analog input range.
The input signal is referenced to signal ground (AGND), and is delivered through two wires:§ Connect the wire carrying the signal to be measured to CHx.
§ Connect the second wire to AGND.
Single-ended measurements using differential channels
To perform a single-ended measurement using differential channels, connect the signal to the CHxH input, andground the associated CHxL input.

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Functional Details

Differential configuration
When the analog input channels are configured for differential input mode, four analog input channels areavailable. A low-noise precision programmable gain amplifier (PGA) is available on differential channels. Eachanalog input has 12-bit resolution and offers software-selectable analog input ranges of ±20 V, ±10 V, ±5 V,±4V, ±2.5 V, ±2.0 V, ±1.25 V, and ±1.0 V.
In differential mode, the input signal is measured with respect to the low input, and is delivered through threewires:§§§

Connect the wire carrying the signal to be measured to CHxH.
Connect the wire carrying the reference signal to CHxL.
Connect the third wire to AGND.

In differential mode, the following two requirements must be met for linear operation:§§

Any analog input must remain in the −10 V to 20 V range with respect to ground at all times.
The maximum differential voltage on any analog input pair must remain within the selected voltage range.

Channel gain queue
The channel gain queue feature allows you to set up a scan sequence with a unique per-channel gain setting andchannel sequence. The gain settings are stored in a channel-gain queue list that is written to local memory on
the device.
The channel-gain queue list can contain up to up to 8 elements in single-ended mode or four elements indifferential mode. The elements must be unique and listed in ascending order. An example of a three-element
list is shown in the table below.
Sample channel gain queue list
Element

Channel

Range

0
1
2

CH0
CH2
CH3

BIP10V
BIP5V
BIP10V

When a scan begins with the gain queue enabled, the BTH-1208LS reads the first element, sets the appropriate
channel number and range, and then acquires a sample. The properties of the next element are then retrieved,
and another sample is acquired. This sequence continues until all elements in the gain queue have been selected.
When the end of the channel list is detected, the sequence returns to the first element in the list. This sequence
repeats until the specified number of samples is acquired.
Carefully match the gain to the expected voltage range on the associated channel or an over range condition
may occur. Although this condition does not damage the device, it does produce a useless full-scale reading,and can introduce a long recovery time due to saturation of the input channel.

Analog output
Two 12-bit analog outputs are available at AOUT0 and AOUT1.
Each analog output channel has an output range of 0 V to 2.5 V. Throughput is system-dependent.
The D/A is software paced.

External clock input
Connect an external clock signal to AICKI to pace input scanning operations.

Digital I/O
You can connect up to eight digital I/O lines to DIO0 through DIO7. When configured for input, the digitalterminals can detect the state of any TTL-level input.
Digital input voltage ranges of up to 0 to 5.5 V are permitted, with thresholds of 0.8 V (low) and 2.0 V (high).
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BTH-1208LS User's Guide

Functional Details

Each DIO channel is an open-drain, which can sink up to 50 mA for direct drive applications when used as an
output.
Figure 5 shows an example of a typical digital output connection.

Figure 5. Digital output connection (typical)

External pull-up capability
Inputs are pulled high by default to 3.3 V through 47.5 kΩ resistors on the circuit board. The pull-up voltage iscommon to all 47.5 kΩ resistors.
You can place an external pull-up resistor on any of the DIO bits in order to limit source current to less than
50 mA, which requires a 100 Ω resistor minimum. A 2 kΩ or 5 kΩ resistor would be typically used, allowing
for a 1 mA current
You can also use an external pull-up resistor to pull the DIO bit up to a voltage that exceeds the internal 3.3 V
pull-up voltage (5.5 V maximum).
When using external pull-up resistors, be aware that the internal resistors cause a slight voltage shift to digital
lines in the on state as various lines change between the on/off states.

Figure 6. Digital I/O external resistor configuration

Trigger input
The TRIG pin is an external digital trigger input that you can configure for either rising/falling edge, or high/low
level.
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Functional Details

Counter input
The CTR pin is a 32-bit event counter that can accept frequency inputs up to 1 MHz. The internal counterincrements when the TTL levels transition from low to high.

GroundThe analog ground (AGND) pin provide a common ground for all analog channels. The digital ground (GND)
pins provide a common ground for the digital, trigger, counter, and power terminals.

Power output
The +VO pin is a 3.3 volt output that can source up to 50 mA that is supplied by the power source of the device.
You can use this terminal to power external devices or circuitry.
Caution! The +V0 pin is an output. Do not connect to an external power supply or you may damage theBTH-1208LS and possibly the computer.
For more information about signals
For more information about analog and digital signals, refer to the Guide to DAQ Signal Connections at
www.mccdaq.com/support/DAQ-Signal-Connections.aspx.

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BTH-1208LS User's Guide

Functional Details

Mechanical drawings

Figure 7. Housing dimensions

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Functional Details

Figure 8. Circuit board dimensions

19

Chapter 4

Specifications
All specifications are subject to change without notice.
Typical for 25°C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input
Table 1. Analog input specifications
Parameter

Condition

A/D converter type
Input voltage range for linear operation

CHx to GND

Absolute maximum input voltage
Input impedance
Input current (Note 1)

Number of channels
Input ranges

Throughput (Note 2)

Specification

CHx to GND
Vin = +10 V
Vin = 0 V
Vin = –10 V
Single-ended
Differential

Software paced
Continuous scan
BURSTIO

Channel gain queue

Resolution (Note 3)

Differential
Single-ended

Integral linearity error
Differential linearity error
Repeatability
Trigger source

Software-selectable

Pacer source

Software-selectable

20

Successive approximation type
Single-ended mode: ±10 V max
Differential mode: –10 V min, 20 V max±25 V max
140 kΩ
70 µA typ–12 µA typ–94 µA typ
8 single-ended or 4 differential; software-selectable±10 V, G=2±20 V, G=1±10 V, G=2
±5 V,
G=4
±4 V,
G=5
±2.5 V, G=8±2.0 V, G=10
±1.25 V, G=16±1.0 V, G=20
Software-selectable
10 S/s typ, system-dependent (Bluetooth)
250 S/s typ, system-dependent (USB)
0.014 S/s to 1024 S/s (Bluetooth)0.014 S/s to 47 kS/s (USB)
0.014 S/s to 47 kS/s to 12K (12,288) sample FIFO
Transfer rate to host is limited to 1024 S/s(Bluetooth)
Software selectable. 8 elements in SE mode,
4 elements in DIFF mode.
One gain element per channel. Elements must be
unique and listed in ascending order.
12 bits, no missing codes
11 bits±1 LSB typ±0.5 LSB typ±1 LSB typ
External digital: TRIG
Software-selectablen Internal
n External (AICKI), rising edge triggered
Software-selectable

BTH-1208LS User's Guide

Note 1:
Note 2:
Note 3:Specifications

Input current is a function of applied voltage on the analog input channels. For a given input voltage, Vin, theinput leakage is approximately equal to (8.181 * Vin – 12) µA.
Maximum throughput when scanning is machine dependent.
The AD7870 converter only returns 11 bits (0 to 2,047 codes) in single-ended mode.

Accuracy
Table 2. Accuracy, differential mode
Range

Accuracy (LSB)

±20 V
±10 V
±5 V
±4 V
±2.5 V±2 V±1.25 V
±1 V

5.1
6.1
8.1
9.1
12.1
14.1
20.1
24.1
Table 3. Accuracy, single-ended mode

Range

Accuracy (LSB)

±10 V

4.0
Table 4. Accuracy components, differential mode – all values are (±)

Range% of Reading

Gain Error at FS (mV)

Offset (mV)

Accuracy at FS (mV)

±20 V
±10 V
±5 V
±4 V
±2.5 V±2 V±1.25 V
±1 V

0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

40
20
10
8
5
4
2.5
2

9.766
9.766
9.766
9.766
9.766
9.766
9.766
9.766

49.76629.76619.76617.76614.76613.766
12.26611.766

Table 5. Accuracy components, single-ended mode – all values are (±)
Range% of Reading

Gain Error at FS (mV)

Offset (mV)

Accuracy at FS (mV)

±10 V

0.2

20

19.53139.531

Noise performance
Table 6. Noise performance, differential mode
Range

Typical counts

LSBrms

±20 V
±10 V
±5 V
±4 V
±2.5 V±2 V±1.25 V
±1 V

3
3
3
4
5
7
10
12

0.45
0.45
0.45
0.61
0.76
1.06
1.52
1.82

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BTH-1208LS User's Guide

Specifications

Table 7. Noise performance, single-ended mode
Range

Typical counts

LSBrms

±10 V

6

0.91

Analog output
Table 8. Analog output specifications
Parameter

Condition

Specification

Resolution

12-bits, 1 in 4,096

Output range

0 V to 2.5 V

Number of channels

2

Throughput (Note 2)
Power on and reset voltage

Software paced
USB operation
Bluetooth operation

Output current drive
Slew rate

Each D/A OUT

10 S/s single channel typ, PC dependent
Initializes to 000h code
The outputs can be individually configured to initialize to000h or to have user configurable values written to the
outputs when the Bluetooth host is connected or
disconnected.
5 mA source capability
0.75 V/ µs typ

Table 9. Analog output accuracy, all values are (±) accuracy tested at no load
Range

Accuracy (LSB)

0 V to 2.5 V

8.0 typ, 73.0 max
Table 10. Analog output accuracy components, all values are (±)

Range
0 V to 2.5 V
Note 4:% of FSR

Gain Error at FS (mV)

Offset (mV)

Accuracy at FS (mV)

0.16 typ,1.44 max

4.0 typ, 36.0 max

1.0 typ, 9.0 max (Note 4)

5.0 typ, 45.0 max

Zero-scale offsets may result in a fixed zero-scale error producing a dead-band digital input code region. In thiscase, changes in digital input code at values less than 0x040 may not produce a corresponding change in the
output voltage. The offset error is tested and specified at code 0x040.

Digital input/output
Table 11. Digital I/O specifications
Parameter

Specification

Digital typeOutput value mapping

3.3 V open drain
0 written: output drives to DGND
1 written: output is pulled up to 3.3 V via internal resistor
8
Individually configurable
0 V to 5.5 V
47.5 kΩ pull-up resistors (to 3.3 V), 2.2 kΩ series resistors
2.0 V min
5.5 V absolute max
0.8 V max
–0.5 V absolute min
0 V recommended min
0 V to 3.3 V (no external pull up resistor)
0 V to 5.5 V max (Note 6)
1.0 µA typ

Number of I/O (Note 5)
Configuration
Input voltage range (Note 6)
Pull up/pull-down configuration
Input high voltage threshold
Input high voltage limit
Input low voltage threshold
Input low voltage limit
Output voltage range
Output off state leakage current (Note 7)22

BTH-1208LS User's Guide

Specifications

Parameter

Specification

Sink current capability
Transistor on resistancePower on and reset state

50 mA max (continuous) per pin
0.7 Ω max
USB operation: All input
Bluetooth operation: The digital I/O can either be all input at power on/resetor may be configured to have user-configurable patterns written to the DIO
when the Bluetooth host is connected or disconnected.

Note 5:Note 6:

Each transistor source pin is internally connected to DGND.
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 47.5 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.

Note 7:

Does not include the additional leakage current contribution through the internal or any external pull-up resistor.

External trigger
Table 12. Digital trigger specifications
Parameter

Specification

Trigger source
Trigger mode

External digital; TRIG terminal
Software configurable for edge or level sensitive, rising or falling edge, high or low
level.
10 µs max
1 µs minSchmitt trigger, 47 kΩ pull-down to ground0.76 V typ
0.4 V min
1.2 V max
1.74 V typ
1.3 V min2.2 V max
5.5 V absolute max
0.98 V typ
0.6 V min
1.5 V max
–0.5 V absolute min
0 V recommended min

Trigger latency
Trigger pulse width
Input type
Schmitt trigger hysteresis

Input high voltage threshold

Input high voltage limit
Input low voltage threshold

Input low voltage limit

External clock input
Table 13. External clock input specifications
Parameter

Specification

Terminal nameTerminal type
Input clock rate
Clock pulse width
Input type
Schmitt trigger hysteresis

AICKI
Input
50 kHz, max
1 µs minSchmitt trigger, 47 kΩ pull-down to ground0.76 V typ
0.4 V min
1.2 V max
1.74 V typ
1.3 V min2.2 V max

Input high voltage threshold

23

BTH-1208LS User's Guide

Specifications

Parameter

Specification

Input high voltage limit
Input low voltage threshold

5.5 V absolute max
0.98 V typ
0.6 V min
1.5 V max
–0.5 V absolute min
0 V recommended min

Input low voltage limit

CounterTable 14. Counter specifications
Parameter

Specification

Pin name
Counter type
Number of channels
Input type
Input source
Resolution
Maximum input frequency
High pulse width
Low pulse width
Schmitt trigger hysteresis

CTR
Event counter
1
Schmitt trigger, 47 kΩ pull-down to ground, rising edge triggered
CTR screw terminal
32 bits
1 MHz
500 ns min
500 ns min
0.76 V typ
0.4 V min
1.2 V max
1.74 V typ
1.3 V min2.2 V max
5.5 V absolute max
0.98 V typ
0.6 V min
1.5 V max
–0.5 V absolute min
0 V recommended min

Input high voltage threshold

Input high voltage limit
Input low voltage threshold

Input low voltage limit

MemoryTable 15. Memory specifications
Parameter

Specification

FIFO

12K (12,288) samples

Non-volatile EEPROM

2,048 bytes (768 bytes calibration, 256 bytes user, 1,024 bytes firmware use)

Microcontroller
Table 16. Microcontroller specifications
Parameter

Specification

Type

High performance 16-bit RISC microcontroller

24

BTH-1208LS User's Guide

Specifications

Power
Table 17. Power specifications
Parameter

Condition

Specification

Supply current, USB source

During enumeration
After USB enumerationor connected to USB
charger / supply< 100 mA
< 500 mA

Battery power (Note 8)
Battery charging
Battery replacement+VO power available+VO output current
Note 8:After USB enumeration
or Bluetooth connection
After USB enumeration
or Bluetooth connection

Two AA cells
Alkaline and NiMH cells supported
NiMH charging supported.
Alkaline cells automatically detected and not charged.
Replace NiMH cells with Panasonic HHR-10AAB only.
Replace Alkaline cells with Energizer E91 orequivalent.
3.3 V nominal
50 mA max

When operating from batteries there is a user configurable power-off timer that will turn the device off when
there is no host connection for the specified amount of time. The timer can be disabled or set to a value from 1
to 255 minutes.

Bluetooth
Table 18. Bluetooth specifications
Parameter

Specification

Device type (Note 9)
Device compatibility
Bluetooth profile
Radio range

Bluetooth 2.1
Backwards compatible with Bluetooth 2.0, 1.2, and 1.1
Serial Port Profile (SPP)
Class II, 10 m typ

Note 9:The Bluetooth radio is disabled when the device is connected to a USB host.

USB
Table 19. USB specifications
Parameter

Specification

Device type
Device compatibility

USB 2.0 full speed
USB 1.1, USB 2.0

Environmental
Table 20. Environmental specifications
Parameter

Specification

Operating temperature range
Storage temperature range
Humidity

0 °C to 50 °C–40 °C to 70 °C
0% to 90% non-condensing

25

BTH-1208LS User's Guide

Specifications

Mechanical
Table 21. Mechanical specifications
Parameter

Specification

Dimensions (L × W × H)
USB cable length
User connection length

146.56 × 81.31 × 27.18 mm (5.77 × 3.28 × 1.07 in.)3 m (9.84 ft) max
3 m (9.84 ft) max

Signal connector
Table 22. Screw terminal specifications
Parameter

Specification

Connector type
Wire gauge range

Screw terminal
16 AWG to 30 AWG
Table 23. Differential mode pinout

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

Signal name
CH0H
CH0L
AGND
CH1H
CH1L
AGND
CH2H
CH2L
AGND
CH3H
CH3L
AGND
AOUT0
AGND
AOUT1
AGND

Pin description
Analog input 0 HI
Analog input 0 LO
Analog ground
Analog input 1 HI
Analog input 1 LO
Analog ground
Analog input 2 HI
Analog input 2 LO
Analog ground
Analog input 3 HI
Analog input 3 LO
Analog ground
Analog output 0
Analog ground
Analog output 1
Analog ground

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

Signal name
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND
+VO
GND
GND
AICKI
CTR
TRIG
GND

Pin description
Digital I/O bit 0
Digital I/O bit 1
Digital I/O bit 2
Digital I/O bit 3
Digital I/O bit 4
Digital I/O bit 5
Digital I/O bit 6
Digital I/O bit 7
Digital ground
User voltage output
Digital ground
Digital ground
External pacer clock input
Counter input
Digital trigger input
Digital ground

Table 24. Single-ended mode pinout
Pin
1

Signal nameCH0H

Pin description
Analog input 0

Pin
17

Signal name
DIO0

Pin description
Digital I/O bit 0

2

CH0L

Analog input 1

18

DIO1

Digital I/O bit 1

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

AGND
CH1H
CH1L
AGND
CH2H
CH2L
AGND
CH3H
CH3L
AGND
AOUT0
AGND
AOUT1
AGND

Analog ground
Analog input 2
Analog input 3
Analog ground
Analog input 4
Analog input 5
Analog ground
Analog input 6
Analog input 7
Analog ground
Analog output 0
Analog ground
Analog output 1
Analog ground

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

DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
GND
+VO
GND
GND
AICKI
CTR
TRIG
GND

Digital I/O bit 2
Digital I/O bit 3
Digital I/O bit 4
Digital I/O bit 5
Digital I/O bit 6
Digital I/O bit 7
Digital ground
User voltage output
Digital ground
Digital ground
External pacer clock input
Counter input
Digital trigger input
Digital ground26

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

Product Category:
Product Description:
Date and Place of Issue:

Measurement Computing Corporation
10 Commerce Way
Norton, MA 02766
USAElectrical equipment for measurement, control and laboratory use.
Wireless Multifunction Device
July 23, 2019, Norton, Massachusetts USA

Measurement Computing Corporation declares under sole responsibility that the product

BTH-1208LS
complies with the essential requirements and other relevant provisions of the following European Directives:
Radio Equipment Directive 2014/35/EU,
Restriction of Hazardous Substances Directive 2011/65/EU

Conformity is assessed in accordance to the following standards:
Essential Requirements:
Standards:
Safety & Health: (Article 3.1(a) of 2014/53/EU)
EN61010-1:2010
EMC (Article 3.1(b) of 2014/53/EU)
Emissions
EN 61326-1:2013 (IEC 61326-1:2012), Class A
EN 55011: 2009/A1:2010(CISPR 11:2009/A1:2010), Group 1, Class A
EN 301 489-1 v2.1.1
EN 301 489-17 v3.1.1
Immunity
EN 61326-1:2013, Basic
EN 301 489-1 v2.1.1
EN 301 489-17 v3.1.1
Radio Spectrum Efficiency (Article 3.2 of 2014/53/EU)

EN 300 328 v2.1.1

Environmental Affairs:

EN 50581:2012

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.
Accessories and software of the product(s):Antenna:
Software:

Carl Haapaoja, Director of Quality Assurance

PCB antenna, max gain 0 dBi
MCC InstaCal, version 6.30 or later

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