DT9838

Strain- and Bridge-Based
Measurement Module
Overview
The DT9838 module is a USB strain gage measurement
device intended for full-, half-, and quarter-bridge strain
gage elements and bridge-based sensor assemblies
such as load cells, torque sensors, and pressure sensors.
General-purpose voltage measurements are also
supported. It is compatible with USB 2.0 and USB 1.1
ports.

Key Features• Four Simultaneous, 24-bit analog input channels and

The tachometer input may also be read in the analog
input data stream. This feature is particularly useful when
you want to correlate the analog input measurementswith tachometer data.

one tachometer in the analog input stream• Direct full-bridge and half-bridge support with halfbridge completion

Bridge Configurations• Quarter-bridge support with external bridgecompletion resistor

All strain gage configurations are based on the conceptof a Wheatstone bridge. A Wheatstone bridge is a
network of four resistive legs, or nodes. One or moreof these legs can be an active sensing element. The
following figure shows a basic circuit diagram of a
Wheatstone bridge.

• Load cell support• Non-bridged voltage input configuration• Programmable input and bridge configuration• Internal bridge excitation of 0 to 10 V in 167 μV
steps• Programmable 100 kΩ ±0.1% shunt resistor per
channel• TEDS (IEEE 1451.4) sensor compatible• Software calibration of the bridge offset and gain
• Sampling frequency from 195.3125 Hz to 52.734 kHz• Input range of ±250 mV• Continuously paced analog input operations• Software-programmable trigger type (software,

VEX+
R1

–

external digital trigger, or variable digital threshold
trigger) to start analog input operations• Sync bus (RJ45) connector for synchronizing
acquisition on up to four DT9838 modules• LEDs for monitoring the arm/trigger state and USB
status• QuickDAQ application support

VO

R2

+

R3

Wheatstone Bridge Circuit Diagram

The Wheatstone bridge is the electrical equivalent of
two parallel voltage divider circuits. R1 and R2 comprise
one voltage divider circuit, and R4 and R3 comprisethe second voltage divider circuit. The output of a
Wheatstone bridge is measured between the middle
nodes of the two voltage dividers (VO).

Supported Operating Systems• Windows® 10/8/7/Vista® 32/64-bit
Analog Input Features
The DT9838 module supports four, simultaneous, analog
input channels that accept bridge sensors through RJ50
connectors on the module. Acquire data from a single
analog input channel or from a group of analog input
channels on the module.

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Physical phenomena, such as a change in strain of a
specimen or a temperature shift, changes the resistanceof the active sensing elements in the Wheatstone bridge.
The Wheatstone bridge configuration is used to measure
the small variations in resistance that the sensing
elements produce corresponding to a physical change inthe specimen.

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Bridge Excitation

A strain gage is a collection of all the active elements ofa Wheatstone bridge. Different bridge configurations areused for different tasks. For each analog input channel,
the DT9838 module supports the following bridge
configurations to measure axial and/or bending strain:

Through the user application software, the bridge
excitation voltage can be programmed between 0 VDC
and 10 VDC with better than 1 mV of resolution. Theinternal bridge excitation circuitry consists of a 16-bit DAC
that programs the bridge excitation for all four channels,
and a separate bridge drive and sense amplifier for eachchannel for individual channel regulation. Each channel
is also individually current limited to 50 mA.

• Quarter-Bridge• Quarter-Bridge Temp Comp• Half-Bridge Poisson• Half-Bridge Bending• Full-Bridge Bending• Full-Bridge Bending Poisson• Full-Bridge Axial Poisson

The power-efficient design of the DT9838 allows for the
powering of multiple bridge configurations on multiple
channels from USB power alone. For more demanding
applications, bridge power capability can be further
enhanced with the use of an external 5 VDC to 24 VDC
power supply.

Note: Each channel can be configured for a voltage
measurement, if a bridge sensor is not being used.
The bridge configurations, and other parameters,
including the gage factor, lead wire resistance, Poisson
ratio, nominal gage resistance, and excitation voltage are
specified in software. The bridge configuration selected
determines the way to wire the sensor elements to thechannel. The circuit diagram for each of the supported
bridge configurations as well as the equations that theDT9838 uses to convert voltage to strain can be found in
the DT9838 User’s Manual.

Remote Sensing and Lead Wire Correction
All bridge types, with the exception of the 3-wire
Quarter-Bridge configuration, support the use of remotesense lines (SENSE+ and SENSE–). The remote senselines continuously monitor the voltage that is applied
across the bridge at the bridge connection points andnull the effects of lead wire resistance by regulating theexcitation voltage across a remotely located bridge orhalf bridge.

Transducer Support

If the remote sense lines are not used to regulate thebridge, the sense lines must still be connected to theexcitation lines either at the screw terminal panel or as
the lines exit the RJ50 connector (connect SENSE+ to
EXC+ and SENSE– to EXC–). You then have the option
to correct for lead wire effects in software by entering
the value of the lead wire resistance from the DT9838
module to the strain gage. Use the same gage wire for
the EXC+ and EXC– lines to ensure that the resistances
are matched. Using software, enter the resistance of one
line, not the sum of the two lines. The software applies
the correction coefficient to the bridge transfer function
for the particular channel.

In addition to strain gages, the DT9838 supports avariety of transducer types, including load cells, pressuretransducers, and torque sensors that are based on the
Wheatstone bridge.
A load cell, which consists of a number of strain gages,
measures load and force by determining the deformationof a structural member as a load or force is applied.
Pressure transducers, which consist of strain gages
mounted on a diaphragm, measure the deformation of
the diaphragm that is proportional to the pressure thatis applied. Torque sensors, which consist of strain gages
mounted on a torsion bar, measure the shear stress as
the torsion bar turns that is proportional to the torque.

Note: If the remote sense leads are used, enter a leadwire resistance correction value of 0 Ω.

To use these transducers, configure the analog input
channel for a full-bridge configuration. These transducers
typically use 350 Ω nominal bridge resistance.

The module cannot detect whether the remote senselines have been connected or not, so you must be awareof how the strain gage was wired and determine theappropriate lead wire correction value.

Instead of supplying a gage factor, use software to enter
the sensitivity of the unit provided by the manufacturerof the transducer. For example, a load cell rated for 100
pounds with a 2 mV/V output has a full-scale output of
20 mV when using 10 V of excitation.

Shunt Calibration
Shunt calibration is another method of compensating
for the lead wire resistance in the bridge. It is used tocalibrate a configured channel to an artificial amount ofstrain that is simulated by altering the resistance of one
element of the connected bridge.

Some transducers also support TEDS or virtual TEDS.
The DT9838 provides TEDS support to interface to thesetransducers directly.

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With the bridge in the unstrained condition, youprogrammatically shunt one of the elements of thebridge with a known precision resistor value. Use either
your own external resistor or the internal 100 kΩ resistor
on the DT9838 module. Using software, the value of thebridge can be read, compared to the expected value, andthe channel calibrated accordingly.

The modules have a passband from DC to 0.49 times the
sample rate, resulting in a maximum signal bandwidth of
25.8 kHz.

Offset Nulling
A balanced bridge under ideal conditions with zero strain
applied produces zero volts. In practice, the output ofa bridge in an unstrained condition is offset from zeroslightly due to imperfect matching of bridge resistances.

Internally, the value that you specify for the internal
clock frequency is multiplied by 512 to set the oscillator
on the module. For example, if you specify an internal
clock frequency of 50 kHz, the module sets the internal
oscillator for the A/D converters to 25.6 MHz. The
maximum timebase is 27 MHz.

It is not necessary to balance a bridge prior to themeasurement. Instead, you can use software to make areference measurement with the bridge in an unstrained
condition. All subsequent data is then offset in softwareby the reference value.

Once the sample clock is started, the module requires
39 clock pulses before the first A/D conversion iscompleted (39/sample rate) due to the group delay ofthe converters. The software automatically adjusts for thegroup delay to provide only valid data in each buffer.

TEDS

The tachometer data (which does not have the 39
sample group delay) is synchronized with the analog data
stream. This is done through the firmware and device
driver by caching the tachometer data and aligning it intime with the analog data in the user’s data buffers.

The actual frequency that the module can achieve may
be slightly different than the frequency you specified
due to the accuracy of the clock. You can determine theactual clock frequency using software.

Each analog input channel on the DT9838 module
provides a Class II TEDS (Transducer Electronic Data
Sheet) interface through the RJ50 connector. Theinterface consists of two-wires (TEDS DATA and TEDS
RETURN).

Analog Input Conversion ModesTEDS is supported by some load-cells and other sensors; it
is not used with strain gages.

The DT9838 module supports the following conversion
modes:• Single-value mode
• Continuous scan mode

Input Resolution
The value that is measured across the bridge of ananalog input channel on the DT9838 module is amplified
and applied to the 24-bit Sigma-Delta analog-to-digitalconverter (ADC). The ADC oversamples the incoming
signal, filters the values, and produces a result.

Single-Value Mode
Single value operations are the simplest to use. Using
software, specify the analog input channel. The module
acquires the data from the specified channel and returns
the data immediately. For a single-value operation, aclock source, trigger source, scan mode, or buffer cannot
be specified. Single-value operations stop automaticallywhen finished.

The resolution of the analog input subsystem is fixed at
24 bits.

Input Range

Note: You cannot read the value of the tachometer using
a standard single-value operation. To read these values,
specify the channel as part of the analog input channel
list using continuous scan mode, described next.

The default full-scale input range for each channel is±250 mV.

A/D Sample ClockContinuous Scan Mode

The ADC master clock is generated by an internal
programmable PLL and allows user-programmable ADC
sample rates from 195.3 S/s to 52734 S/s.

Continuous scan mode takes full advantage of thecapabilities of the DT9838 module. Use continuous
scan mode to accurately control the period between
successive simultaneous conversions of all channels ina channel list. A channel list, clock source, start trigger,
reference trigger, post-trigger scan count, and buffer canbe specified using software.

Note: According to sampling theory (Nyquist Theorem),
specify a frequency that is at least twice as fast as the
input’s highest frequency component. For example, toaccurately sample a 20 kHz signal, specify a sampling
frequency of at least 40 kHz to avoid aliasing.

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• Analog Threshold trigger – An analog threshold

Up to five entries can be made in the channel list,
including the four analog input channels (A/D channels 0to 3) and the tachometer (A/D channel 4).

trigger event occurs when the signal on a specified
analog input channel rises above or falls below
a programmable threshold level. The following
parameters are specified using software:oo Start trigger source – Specify a positive (low-tohigh transition) threshold trigger to trigger when
the signal rises above a threshold level, or anegative(high-to-low transition) threshold trigger
to trigger when the signal falls below a thresholdlevel.
oo Threshold channel – Specify any one of theanalog input channels as the threshold input
channel.
oo Threshold level – Specify a value between –10 V
and 10 V as the threshold level.
• Sync Bus trigger – When multiple DT9838 modules(or multiple DT9838 and DT9837 Series modules)
are connected together using the Sync Bus (RJ45)
connector, the slave module can receive a trigger
from one of the other modules. Specify thesynchronization module as slave.

When it detects the start trigger, the module
simultaneously acquires pre-trigger data from all of the
input channels specified in the channel list, including thetachometer, and converts the data from the analog input
channels. The sampled data is placed in the allocatedbuffer(s).
When the reference trigger occurs, pre-trigger dataacquisition stops and post-trigger acquisition starts.
The operation continues until the number of samples
specified for the post-trigger scan count is acquired; atthat point, the operation stops.
The conversion rate is determined by the frequency of
the input sample clock. The sample rate, which is the rate
at which a single entry in the channel list is sampled, isthe same as the conversion rate due to the simultaneous
nature of the module.
Using software, a scan can be stopped by performing
either an orderly stop or an abrupt stop. In an orderly
stop, the module finishes acquiring the current buffer,stops all subsequent acquisition, and transfers theacquired data to host memory; any subsequent triggers
are ignored. In an abrupt stop, the module stops
acquiring samples immediately; the current buffer is notcompletely filled, it is returned to the application only
partially filled, and any subsequent triggers are ignored.

Reference Trigger Sources
The DT9838 module supports the following sources forthe reference trigger:• External digital (TTL) trigger – An external
digital (TTL) reference trigger event occurs when
the DT9838 module detects either a rising-edge(positive) or falling-edge (negative) transition on
the signal connected to the Ext Trigger pins (pin 3
and 4) of the External Trigger and Tachometer (J6)connector on the module. Using software, specify
the reference trigger source as an external, positive
digital (TTL) trigger or an external, negative digital(TTL) trigger.
• Threshold trigger – A threshold reference trigger
event occurs when the signal on a specified
analog input channel rises above or falls below a
programmable threshold level. Using software,
specify the following parameters:
oo Start trigger source – Specify a positive (low-tohigh transition) threshold trigger if you want totrigger when the signal rises above a thresholdlevel, or a negative (high-to-low transition)
threshold trigger if you want to trigger when thesignal falls below a threshold level.
oo Threshold channel – Specify any one of theanalog input channels as the threshold input
channel.
oo Threshold level – Specify a value between –250
mV and +250 mV as the threshold level. (In the
QuickDAQ application, this value is specified
in the appropriate engineering units for thechannels, such as microstrain.)

Input Triggers
A trigger is an event that occurs based on a specified
set of conditions. On the DT9838 module, a start trigger
source and a reference trigger source can be specified.
Pre-trigger data acquisition starts when the start trigger
event occurs. When the reference trigger event occurs,
pre-trigger data acquisition stops and post-trigger
acquisition starts. Post-trigger acquisition stops when thenumber of samples you specify for the post-trigger scancount has been reached.

Start Trigger Sources
The DT9838 module supports the following sources forthe start trigger:• Software trigger – A software trigger event occurs
when the analog input operation is started (thecomputer issues a write to the module to begin
conversions).
• External digital (TTL) trigger – An external digital(TTL) trigger event occurs when the DT9838 module
detects either a rising-edge (positive) or falling-edge(negative) transition on the signal connected to
the Ext Trigger pins (pin 3 and 4) of the J6 screw
terminal connector on the module.

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• Sync Bus trigger – When multiple DT9838 modules

The software automatically synchronizes the value of thetachometer input with the analog input measurements,
so that all measurements are correlated in time. The
tachometer input is treated like any other channel in theanalog input channel list; therefore, all the triggering andconversion modes supported for analog input channels
are supported for the tachometer input.

(or multiple DT9838 and DT9837 Series modules)
are connected together using the Sync Bus (RJ45)
connector, you can set the reference trigger of aslave DT9838 module to Sync Bus if you want toreceive a Sync Bus trigger from one of the othermodules to stop pre-trigger acquisition and start
post-trigger acquisition.

Using the count that is returned from the tachometer
input, you can determine the following:

Tachometer Input Features• Frequency of a signal pulse (the number of periods

A tachometer signal with a range of ±30 V can beconnected to pins 1 and 2 of the J6 screw terminal
connector on the DT9838 module. This signal has amaximum frequency of 1 MHz and a minimum pulse
width of 0.4 μs. The threshold voltage is fixed at +2 V
with 0.5 V of hysteresis.

per second). You can calculate the frequency as
follows:
oo Frequency = 12 MHz/(Number of counts – 1)
where 12 MHz is the internal counter/timer clock
frequency. For example, if the count is 21, themeasured frequency is 600 kHz (12 MHz/20).
• Period of a signal pulse. You can calculate the period
as follows:
oo Period = 1/Frequency
oo Period = (Number of counts – 1)/12 MHz where
12 MHz is the internal counter/timer clock
frequency

The frequency or period of the tachometer input signal
can be measured to calculate the rotation speed forhigh-level (±30 V) tachometer input signals. An internal
12 MHz counter is used for the measurement, yielding a
resolution of 83 ns (1/12 MHz).
The number of counts can be read between two
consecutive starting edges of the tachometer input
signal by including channel 4 in the analog input channel
list. The starting edge is programmable (either rising or
falling).

Synchronizing Acquisition on Multiple
ModulesDT9838 modules provide a Sync Bus (RJ45)
synchronization connector that can be used to connect
and synchronize multiple DT9838 modules.

Using software commands, you can specify the following
parameters for the tachometer input:

Note: DT9837A, DT9837B, and/or DT9837C modules
can also be connected to the DT9838 module in thisconfiguration.

• The starting edge of the tachometer input signal touse for the measurement (rising or falling edge).

• A flag (called Stale) indicating whether or not thedata is new. If the Stale flag is set as Used (thedefault value), the most significant bit (MSB) of thevalue is set to 0 to indicate new data; reading thevalue before the measurement is complete returns
an MSB of 1. If the Stale flag is set to Not Used, theMSB is always set to 0.

In this scheme, one module is the master and the othermodules are the slave. The synchronization mode
(master, slave, or none) of the RJ45 connector is specified
using software.
When configured as a master, the Sync Bus connector
outputs trigger and clock signals. When configured
as a slave, the Sync Bus connector accepts trigger andclock signals from the master; the start trigger source isignored in this configuration since the Sync Bus is used as
the start trigger. When configured as none (the defaultmode), the DT9838 module uses the USB clock insteadof the Sync Bus connector. The synchronization moderemains set until changed or until the application exits.

When the operation is started, the internal 12 MHz
counter starts incrementing when it detects the firststarting edge of the tachometer input and stops
incrementing when it detects the next starting edgeof the tachometer input. When the measurement iscomplete, the counter remains idle until it is read. On thenext read, either 0 or the current value of the tachometer
input (from the previous measurement operation) is
returned depending on the module and the tachometersettings, described above, and the next operation isstarted automatically.

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Multiple modules can be connected in one of two
ways. The following diagrams show how to connect amaximum of two DT9838 modules by daisy chaining
them together through the Sync Bus connector, and how
to connect a maximum of four DT9838 modules by using
an RJ45 distribution panel, such as the EP386, where thepanel contains four RJ45 connectors that are wired inparallel.

Note: It is important to start the slave modules first,
followed by the master module so that the slave receives
the appropriate clock and trigger signals from the master.
If the master module is started before the slaves, theslaves never start; you will see a delay of approximately
20 seconds if you try to stop or abort the analog input
operation on a slave module that is waiting for a trigger.
When the master module is stopped, the slaves continue
to run and return data until the analog input subsystemon the slave modules is stopped. Be sure to stop the
analog input subsystems on all slave modules before
disconnecting the cable from the Sync Bus connectors.

Host PC

USB
Port 1

InputsDT9838MasterUSB
Port 2MasterSynchronization Mode is Master.
Start Trigger can be Software, External
Digital Trigger, or Threshold Trigger.

USB

Reference Trigger can be External Digital
Trigger or Threshold Trigger.

Cross-Series Compatibility

Sync Bus (RJ45)

DeviceUnder Test

Virtually all Data Translation data acquisition modules
are compatible with the DT-Open Layers® software
standard. This means any application developed with
one of Data Translation’s software products can easily be
upgrade to a new Data Translation module with little tono reprogramming needed.

Slave
Synchronization Mode is Slave.

USB

DT9838Slave

Start Trigger is ignored (Sync Bus is used).

InputsReference Trigger can be External Digital
Trigger, Threshold Trigger, or Sync Bus.
(Sync Bus is generally used in thisconfiguration.)

Synchronizing Two DT9838 Modules by Daisy Chaining theSync Bus Connectors

QuickDAQ
MasterSynchronization Mode is Master.

USB
Port 1

Reference Trigger can be External Digital
Trigger, or Threshold Trigger.

InputsDeviceUnder Test

DT9838MasterQuickDAQ allows you to acquire and display from all
Data Translation USB and Ethernet data acquisition
devices that support analog input streaming. Combine
QuickDAQ with Data Translation hardware to acquiredata, record data to disk, display the results in both aplot and digital display, and read a recorded data file.
Be productive right out of the box with this powerfuldata logging software. Data can be exported to otherapplications like Microsoft Excel® and The Mathworks
MATLAB® for more advanced analysis. Two additional
options can be purchased to add FFT analysis capabilities
to the base package.

Host PC

Start Trigger can be Software, External
Digital Trigger, or Threshold Trigger.

USB
Port 2

USB
Port 3

USB
Port 4USB

EP386
RJ45 Distribution
Panel (connectors
wired in parallel)

Sync Bus

USB
DT9838Slave

Sync Bus

InputsUSB

InputsDT9838Slave

Sync Bus
USB

DT9838Slave

Sync BusKey Features

Inputs• QuickDAQ Base Package (Free)

Slave
Synchronization Mode is Slave.

oo Ready-to-measure application software
oo Configure, acquire, log, display, and analyze yourStart Trigger is ignored (Sync Bus is used).
Reference Trigger can be External Digital Trigger, Threshold Trigger,
or Sync Bus. (Sync Bus is generally used in this configuration.)data
oo Customize many aspects of the acquisition,* The RJ45 cables must be less than 1 foot in length. For
minimum clock skew, the master module must be less than 4
inches away from the RJ45 distribution panel.

display, and recording functions to suit yourneeds
• FFT Analysis Option (License Required)oo Includes all the features of the QuickDAQ Base
Packageoo Perform single-channel FFT operations including:◊ Auto Spectrum◊ Spectrum◊ Power Spectral Density
oo Configure and view dynamic performancestatistics
oo Supports Hanning, Hamming, Bartlett, Blackman,
Blackman Harris, and Flat Top response windows

Synchronizing Four DT9838 Modules Using the EP386 Sync
Bus Distribution Panel

When synchronizing multiple modules, start the slave
modules before starting the master module. When themaster module is triggered (using any of the supported
trigger sources), both the master and the slave modules
start acquiring data at the same time (within one A/D
conversion of the clock). Note that the clock rate can be
set to be the same or different on each module.

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QuickDAQ with Advanced FFT Analysis Option.

• Advanced FFT Analysis Option (License Required)• DataAcq SDK — Use the DataAcq SDK to use Visualoo Includes all the features of the QuickDAQ Base

Studio 6.0 and Microsoft® C or C++ to develop
application software for a DAQ module using
Windows 10/8/7/Vista/XP 32/64-bit; the DataAcq
SDK complies with the DT-Open Layers standard.
• DAQ Adaptor for MATLAB — Data Translation’s
DAQ Adaptor provides an interface between the
MATLAB® Data Acquisition (DAQ) toolbox fromThe MathWorks™ and Data Translation’s DT-Open
Layers architecture.
• LV-Link — Data Translation’s LV-Link is a library of
VIs that enable LabVIEW™ programmers to accessthe data acquisition features of DT-Open Layers
compliant USB and PCI devices.

Package and FFT Analysis Package
oo Perform 2-channel FFT operations including:◊ FRF◊ Cross-Spectrum◊ Cross Power Spectral Density◊ Coherence◊ Coherent Output Poweroo Additional FFT analysis functions supported:
Exponential, Force, Cosiner Taperoo Save data to .uff file format
oo Supports real, imaginary, and Nyquist display
functions

Other Software Options
The following software is available for use with thismodule and is provided on the Data Acquisition Omni
CD:

• Device Driver — The device driver allows you to
use the DAQ module with any of the supported
software packages or utilities.
• Calibration Utility — This utility allows you tocalibrate features of the DAQ module.
• DT-Open Layers® for .NET Class Library — Use thisclass library if you want to use Visual C#® or Visual
Basic® for .NET to develop application software
for a DAQ module using Visual Studio® 2003-2012;
the class library complies with the DT-Open Layers
standard.

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Accessories• STP Strain General-Purpose Accessory – This accessory contains four
general-purpose screw terminal panels. Use one screw terminal panel
for each channel.
• STP Strain 120 Quarter-Bridge Completion Accessory – This accessory
contains four screw terminal panels with a 120 Ω quarter-bridge
completion resistor installed on each screw terminal panel. Use one
screw terminal panel for each channel.
• STP Strain 350 Quarter-Bridge Completion Accessory – This accessory
contains four screw terminal panels with a 350 Ω quarter-bridge
completion resistor installed on each screw terminal panel. Use one
screw terminal panel for each channel.
• EP398 RJ50 cables – The EP398 accessory contains four RJ50 cables
that are used to connect four STP STRAIN, STP STRAIN 120, or STP
STRAIN 350 screw terminal panels to the DT9838 module.
• EP394 +5 V external power supply – Use this optional power supply if
you want to use external +5 V power to power the DT9838 module.
• EP386 panel – The EP386 panel contains four RJ45 connectors that are
wired in parallel, making it useful when attaching up to four DT9838
modules together using the Sync Bus.

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DT9838-Datasheet		8

Ordering Summary
HARDWARE• DT9838
ACCESSORIES• EP386• EP394• EP398• STP STRAIN• STP STRAIN 120• STP STRAIN 350
FREE SOFTWARE• QuickDAQ• DAQ Adaptor for MATLAB• LV-Link
OPTIONAL SOFTWARE• QuickDAQ FFT Analysis Option (License
Required)• QuickDAQ Advanced FFT Analysis Option(License Required)info@mccdaq.com

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May 2017. Rev 6© Measurement Computing Corporation