DT9857E

Dynamic Signal Analyzer for Soundand Vibration Analysis Expandable to64 Channels
Overview
The DT9857E is a high accuracy dynamic signal acquisition
module for noise, vibration, and acoustic measurements.
Eight or sixteen, 24-bit, IEPE (ICP®) sensor inputs aresynchronized with a tachometer input, two measurement
counters, and a general purpose counter/timer toprovide data streams that are matched in time, for fieldor laboratory use. Up to two stimulus D/A outputs, each32-bit resolution, and an 8-bit digital output port areavailable for dynamic waveform generation and control.
This rugged, compact module, available either as an OEM
board or steel-encased module, connects via USB making
them ideal for many measurement applications.

Key Features
The DT9857E offers many capabilities for vibration
measurement such as 16 IEPE 24-bit Delta-Sigma sensor
inputs, up to two 32-bit D/A stimulus outputs, a 32-bit
tachometer, pre- and post-triggering. The Sync Bus allows
expansion to 64 analog input channels and 8 analog output
channels, and the ability to time sync all data to the input
data stream.

• Simultaneous IEPE analog inputs, waveform stimulus
analog outputs, tachometer synchronous with input
data stream, advanced pre and post triggering,
16 DIO (8 in/8 out), synchronous counter/timers,
and Sync Bus for up to 64 A/D channels and up to
8 D/A channels.
• All inputs and outputs can be synchronized formeasurement data coherence
oo Supports the ability to return the value of thedigital input port, tachometer, measure counters,
and general-purpose counter in the analog input
data stream, all synchronous with analog input
data stream providing correlation of tachometeror any digital input with analog signals.
• Eight (DT9857E-8) or sixteen (DT9857E-16)
Simultaneous, IEPE inputs up to 4 mA at 24 V
compliance, all inputs use 24-bit Delta-Sigma A/Dconverters for high resolution measurement to105.4 kS/s/ch, AC or DC coupling.
• Up to two 32-bit D/A converter output channels forstimulus or waveform generation to 216 kS/s/ch.
• Start trigger (software, threshold, external, or SyncBus) for acquiring post-trigger samples; reference
trigger for acquiring pre/post trigger samples.
• Analog threshold trigger on any of the analog input
channels to program the threshold value from –10 V
to +10 V.
• SyncBus connector for synchronizing acquisition andwaveform stimulus on up to four DT9857E modules• External 4.75 V to 28 V power supply

QuickDAQ with Advanced FFT Analysis option adds realtime analysis features to sound & vibration test systems.
It supports the DT9857E through a series of easy-to-use
configuration windows.

Supported Operating Systems• Windows® 10/8/7/Vista® 32/64-bit(508) 946-5100

1

info@mccdaq.com

mccdaq.comBlock diagram shows all functions of the DT9857E with functions in the same general area of the physical board below.
(508) 946-5100

2

info@mccdaq.com

mccdaq.com

Header for 4.75 Vto 28 V power

8 IEPE Input Channels

Capacitor notch minimizes error voltages
due to vibration or board stress

Sync Bus Connectors

DIN Connector
for 4.75 V to 28 V
power

Locking USB
connector

2 stimulus Waveform Output Channels(if supported)
Outputs and Inputs can be synced toprovide time coherent measurement data

6 layer board provides internalgrounds to maintain signal integrity
Digital Connector(DIO, Tachometer,Counter/Timer)
Ext. Trigger

DT9857E-8 shown without case.

(508) 946-5100

3

info@mccdaq.com

mccdaq.com

24-bit Delta-Sigma
A/D per channel
Full simultaneousoperation

Top Board

16 IEPE Inputs...
– 8 on top board– 8 on bottom board
Each IEPE input: up to4 mΩ @24 V complianceaccommodates mostaccelerometers
BottomBoard

2, 32-bit Waveform
DACs generate
2 separate stimulus(if supported)

Exploded view of the DT9857E with a two board construction and metal case.

Analog Input Channels

IEPE Support

The DT9857E-8 module provides eight analog input
channels and the DT9857E-16 module provides 16 analog
input channels. IEPE sensors can be connected to these
BNC inputs. Software-selectable gains of 1 and 10 provide
effective input ranges of ±10V and ±1 V. Each analog
input channel uses a 24-bit Delta-Sigma analog-to-digitalconverter (ADC) that provides anti-aliasing filtering basedon the clock rate.
In addition to acquiring data from the analog
input channels, the DT9857E supports the ability tosimultaneously acquire the value of the tachometer
input, general-purpose counter/timer, measure counters,
and digital input port in the analog input stream,
allowing precise correlation of all input signals.

Applications that require accelerometer, vibration, noise,or sonar measurements often use IEPE sensors. IEPE
conditioning is built-in to the analog input circuitry of theDT9857E module. Each analog input channel provides thefollowing capabilities for IEPE support:• Excitation current source — Internal excitation
current source of 4 mA.
• Coupling type — Software-programmable AC
coupling or DC coupling.
• Compliance voltage — +24 V(508) 946-5100

4

info@mccdaq.com

mccdaq.com

Analog Input Clock

Analog Output Channels

The DT9857E module supports an internal A/D clock,which is derived from the 48 MHz crystal oscillation. Users
can program the sampling frequency at which to pace
the input operations. The sampling frequency ranges
from 195.3125 Hz to 105.469 kHz.

The DT9857E module supports up to two 32-bit analog
output channels with an output range of ±10V. A twopole Butterworth filter and quiet start circuitry prevents
noise from interfering with the output signal.
The DT9857E module supports single-value, waveform,and continuous analog output operations. In addition,
the digital output port can be updated simultaneouslywith the analog output channels for simultaneous
stimulus and control applications.
Note: Each DT9857E module is available without analog
output functionality; refer to the “Ordering Summary”
section for module names.

Input Triggers
The DT9857E module supports both a start trigger anda reference trigger. Users can specify a start trigger toacquire post-trigger data when the specified start trigger
event occurs. To acquire pre- and post-trigger data, users
can specify both a start trigger and a reference trigger.
In this case, pre-trigger data is acquired when the start
trigger occurs and post-trigger data is acquired when thereference trigger occurs. Post-trigger acquisition stops
when a user-specified number of samples have beenacquired.
The following trigger sources are supported: software
trigger source (start trigger only), external digital (TTL)
positive or negative trigger, threshold trigger, or Sync Bustrigger (start trigger only).
The software trigger event occurs when the operationis started (the computer issues a write to the module tobegin conversions.)
On the DT9857E the external digital connector isavailable as a dedicated BNC input.
For the threshold trigger, any analog input channel canbe used as the trigger source and the threshold level
can range between ±10V (gain of 1) or ±1 V (gain of10). The trigger can be programmed to occur when thesignal either rises above or falls below the user-specified
threshold value.
The Sync Bus input trigger is available when multiple
modules are connected together using the Sync Bus(RJ45) connectors. By specifying the analog input
subsystem module as the master and the analog input
subsystems of the other connected modules as slaves, theclocks and triggers of the analog input subsystem on themaster are propagated to the slave modules through theSync Bus. Therefore, when the analog input subsystemon the master module is triggered, the analog input
subsystems of the slave modules are also triggered.

(508) 946-5100

Analog Output ClockThe DT9857E module supports an internal D/A clock,which is derived from the 48 MHz crystal oscillator.
The clock frequency of the D/A output clock can be
programmed to a value between 30 kHz and 216 kHz forpacing output operations.

Output Triggers
To start an output operation, the following output
triggers are supported: software trigger or external
digital (TTL) positive or negative trigger. The software
trigger event occurs when the operation is started (thecomputer issues a write to the module to begin theoutput operation.)On the DT9857E, the external digital trigger is available
as a dedicated BNC input.
The user can use the Sync Bus output trigger when
multiple DT9857E modules are connected together using
the Sync Bus connectors. By specifying the analog output
subsystem of one module as the master and the analog
output subsystems of the other connected modules
as slaves, the clocks and triggers of the analog output
subsystem are propagated to the slave modules throughthe Sync Bus connectors. Therefore, when the analog
output subsystem on the master module is triggered, theanalog output subsystems of the slave modules are also
triggered.

5info@mccdaq.commccdaq.com

Tachometer Input

Users can read all 8 digital input lines or write to all
8 digital output lines with a single-value digital I/O
operation. Users can also return the value of the digital
input port in the analog input stream for synchronous
input measurements, or update the value of the digital
output port in the analog output stream for synchronous
waveform stimulus and control.

The DT9857E module supports a tachometer input signal
with a range of ±30 V. The frequency or period between
two edges of the tachometer input signal can bemeasured to calculate the rotational speed of the highlevel tachometer input. The value can then be returned
the value in the analog input data stream.
The starting edge (either rising or falling) of thetachometer signal is programmable. An internal 12 MHz
counter is used for the measurement.
On the DT9857E, the tachometer is available as pin 11 of
the Digital connector.

Synchronizing Multiple Modules
Input operations and output operations can besynchronized on up to four DT9857E modules. In thisscheme, one module is the master and the other modules
are slaves. When configured as a master, the Sync Bus
connector outputs trigger and clock signals. Whenconfigured as a slave, the Sync Bus connector accepts
trigger and clock signals from the master.
The following diagram shows how to connect amaximum of four DT9857E modules (64 analog inputchannels and 8 analog output channels) by using anRJ45.

General-Purpose Counter/Timer
The DT9857E module supports a 32-bit, general-purpose,counter/timer. The value of the counter/timer can be
returned in the analog input data stream, if desired.
The following counter/timer functions are supported:
event counting, edge-to-edge measurement, continuousedge-to-edge measurement (for determining thefrequency and period width of a signal), continuous pulse
output, one-shot, repetitive one-shot, and up/down
counting operations.
Programmable gates, clocks, and output signals are also
supported.

Measure Counters
Two measure counters are supported by the DT9857E
module. The module can measure the frequency orperiod between two signals or two edges of the same
signal and return the value in the analog input data
stream. This is useful for correlating analog input anddigital positional data.
A variety of programmable signals and edges aresupported for the measurement, including the A/D
conversion complete, tachometer signal, general-purpose
counter/timer, and digital input signals. An internal
48 MHz counter is used for the measurement.

Digital I/O Lines
The DT9857E module supports one digital input port,
consisting of 8 digital input lines and one digital output
port, consisting of 8 digital output lines.

(508) 946-5100

A master/slave connection allows up to four DT9857E
modules (up to 64 input channels and up to 8 analog outputchannels) to be synchronized together.

6info@mccdaq.com

mccdaq.com

Up to four DT9857E modules can besynchronized to measure 64 analog inputs
and 8 analog outputs.

The Sync Bus connection for the DT9857E is shown for 64 analog input channels and 8 analog output
channels.
(508) 946-5100

7

info@mccdaq.com

mccdaq.com

Below are images highlighting the superior dynamic performance characteristics of the DT9857E using QuickDAQ.

Noise Level

Total Harmonic Distortion (THD)

Spurious Free Dynamic Range (SFDR)Effective Number of Bits (ENOB)

Crosstalk (@105 kHz)(508) 946-5100

8

info@mccdaq.com

mccdaq.com

QuickDAQ with Advanced FFT Analysis Option.

QuickDAQ• Advanced FFT Analysis Option (License Required)oo Includes all the features of the QuickDAQ Base
Package and FFT Analysis Package
oo Perform 2-channel FFT operations including:◊◊ FRF◊◊ Cross-Spectrum◊◊ Cross Power Spectral Density◊◊ Coherence◊◊ Coherent Output Poweroo Supports real, imaginary, and Nyquist display
functionsoo Additional FFT analysis functions supported:
Exponential, Force, Cosiner Taperoo Save data to .uff file format

QuickDAQ 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.

Key Features• QuickDAQ Base Package (Free)
oo Ready-to-measure application software
oo Configure, acquire, log, display, and analyze dataoo Customize many aspects of the acquisition,
display, and recording functions to suit yourneeds• FFT Analysis Option (License Required)oo Includes all the features of the QuickDAQ BasePackage
oo 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(508) 946-5100

9info@mccdaq.com

mccdaq.com

Other Software Options

Ordering Summary

The following software is available for use with this module and is provided
with Data Acquisition Omni software:• Device Driver — The device driver allows you to use the DAQ modulewith any of the supported software packages or utilities.
• Calibration Utility — This utility allows you to calibrate features of theDAQ module.
• DT-Open Layers® for .NET Class Library — Use this class library if youwant to use Visual C#® or Visual Basic® for .NET to develop application
software for a DAQ module using Visual Studio® 2003-2012; the classlibrary complies with the DT-Open Layers standard.
• DataAcq SDK — Use the DataAcq SDK to use Visual Studio 6.0 andMicrosoft® 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
from The 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 access the data acquisition features of
DT‑Open Layers compliant USB and PCI devices.

HARDWARE• DT9857E-8• DT9857E-8-OEM• DT9857E-8-xAO• DT9857E-8-xAO-OEM• DT9857E-16• DT9857E-16-OEM• DT9857E-16-xAO• DT9857E-16-xAO-OEM
ACCESSORIES• EP361 — +5 V power supply and cable.
Required for OEM configurations.
• EP386 — RJ45 Patch Panel, contains four
RJ45 connectors that are wired in parallel,
to connect four DT9857E modules together
using the Sync Bus• STP25 — Screw terminal panel for DIO,
counter/timer, and external trigger
connections. Includes EP403 cable.
FREE SOFTWARE• QuickDAQ• DAQ Adaptor for MATLAB• LV-Link
OPTIONAL SOFTWARE• QuickDAQ FFT Analysis Option (LicenseRequired)• QuickDAQ Advanced FFT Analysis Option(License Required)• DASYLab(508) 946-5100

10

info@mccdaq.com

mccdaq.com		August 2019. Rev 4DT9857E-Datasheet© Measurement Computing Corporation