DT9805 and DT9806
USB Thermocouple Measurement
Modules
Overview
The DT9805 and DT9806 low-cost, isolated, USB dataacquisition (DAQ) modules feature integrated signal
conditioning designed specifically for thermocouple
measurements.
The DT9805 and DT9806 bring true plug-and-playtemperature measurements to PCs with USB 2.0 or 1.1
ports. Simply attach the DT9805 or DT9806 module tothe PC using the supplied USB cable, directly connect
up to 7 thermocouples to the screw terminals on themodule, and run the free QuickDAQ application.
Linearized temperature data is returned in degrees C, F,or K. You don’t have to open your computer or do any
programming. It’s that simple. All power is provided fromthe USB cable to the PC.

The DT9805 and DT9806 modules are ideally suited for plugand-play thermocouple measurements. Pluggable screw
terminal blocks allow you to connect thermocouples andother sensor types directly to the module.

The DT9805 and DT9806 modules both feature a Cold
Junction Compensation (CJC) channel, 7 differential
analog input channels, 8 digital input lines, 9 digital
output lines, and 2 counter/timer channels. In addition,
the DT9806 provides 2 analog output channels for highresolution, single-value output operations. To add morechannels (up to 889 thermocouples), simply add more
modules to your system using one or more USB hubs.

Specialized Analog Input Design
The DT9805 and DT9806 provide a CJC channel on analog
input channel 0 that provides 10 mV/°C with an accuracyof 1° (from 5 °C to 45 °C). Seven differential analog input
channels are available for connecting B, E, J, K, N, R, S, orT thermocouple inputs. Thermocouple break detectionis also provided to set the value to full-scale if an open
circuit is detected at the input.

Key Features• ±500 V galvanic isolation – protects signal integrity• Built-in CJC (cold-junction compensation)• High accuracy: 0.20° C• Compatible with B, E, J, K, N, R, S, T thermocouple

USBInterface

MicroController

500 Volt Isolation Barriertypes• 16 single-ended/8 differential; analog inputs, 16-bitresolution• Up to 50 kS/s sample rate
• 16 DIO, 2 counter/timers• Optional analog outputs: 16-bits• Compatible with LabVIEW and MATLAB• Includes free QuickDAQ software to get up andrunning quickly

DynamicDigital
OutputClockGate
OutTwo 16-Bit User
Counter/Timers

Isolated
DC-DC andPower Control

HighSpeed
Isolated
Data
Path

Isolated
PowerChannel-Gain
List (32 Entries)

Isolated Side
Control Logic

7 Thermocouples(16SE/8DI Analog Inputs)

8 Digital
Outputs

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

CJC

AnalogInput MUXProgrammable
Gain Amplifier(x1, 10, 100, 500)

8 Digital
Inputs2048Sample
FIFO

16-BitA/D Converter

External Clockand Trigger Logic

Trigger

16-Bit D/A Converter(DT9806 only)
Channel 0

Channel 1

Clock

This block diagram shows all the subsystems and useraccessible signals of the DT9805 and DT9806 modules.
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Flexible Digital I/O Lines

All analog inputs are multiplexed to a single 16-bit
analog-to-digital (A/D) converter.

The DT9805 and DT9806 modules feature 8 digital input
lines for single-value operations. You can also read all
the digital input lines simultaneously with the analog
input channels at the A/D clocked rate. The digital input
lines can be clock separately as the only channel in thechannel-gain list at up to 50 kS/s.

Four programmable gains (1, 10, 100, and 500) areprovided to support input signal ranges of ±10 V, ±1 V,±0.10 V, and ±0.020 V. For thermocouple inputs, which
are typically in the range of 20 mV, DT9805 and DT9806
modules provide a dynamic range of 100,000:1 (100 db)
to ensure that the input signals are amplified to the full
±10 V range of the A/D converter and digitized to 16
bits for maximum accuracy. Each channel is configurable,
allowing you to mix and match input signals according
to your needs. In addition, DT9805 and DT9806 modules
support autoranging, where the software can determine
the appropriate gain based on the input range you
specify (in single-value mode).

Eight digital outputs provide single-value operations.
A dynamic digital output line can synchronize externaldevices. You can program the value of this line to change
state as an analog input channel is read.

Programmable Clocks and Triggers
To start analog input measurements, select either aninternal or external trigger source. Select the internal
trigger to start the operation based on a softwarecommand. Select an external trigger to start theacquisition based on an external event. To use theexternal trigger, connect a TTL-level signal to the screw
terminal of the module labeled External A/D Trigger. The
trigger occurs on the rising edge of this signal.

The maximum sample rate depends on the gain thatis used: 50 kS/s when the gain is 1 or 10, 10 kS/s when
the gain is 100, and 2 kS/s when the gain is 500. The
minimum sample rate is 0.75 S/s.

Flexible Acquisition Modes
Using the DT9805 or DT9806, you can acquire a single
sample from a single analog input channel or multiple
samples from multiple analog input channels. A
32-location channel-gain list gives you the flexibility tosample non-sequential analog input channels, analog
input channels with different gains, and digital inputs
with the analog input channels you want at the A/D
sample rate.

User Connections

The DT9805 and DT9806 provide two ways to cycle
through the channel-gain list:• Continuous scan mode – Choose this mode if you
want to accurately control the period between
conversions of individual channels in a channel-gainlist.
• Triggered scan mode – Choose this mode if you
want to accurately control both the period between
conversions of individual channels in a channelgain list and the period between each scan, orcycle, through the channel-gain list. This mode isuseful when synchronizing or controlling external
equipment or when acquiring a buffer of data oneach trigger or retrigger.

High-Resolution Analog Outputs
The DT9806 module provide two DC-level analog output
channels for single-value operations. A 16-bit digital-toanalog converter provides high-resolution output values
with an output range of ±10 V.

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2PinSignal Description

PinSignal Description

1Analog Input 00/CJC Circuit

28Digital Input 02Analog Input 08/00 Return

29

Digital Input 13Analog Input 01

30

Digital Input 24Analog Input 09/01 Return

31

Digital Input 35Analog Input 02

32

Digital Input 46Analog Input 10/02 Return33

Digital Input 57Analog Input 03

34

Digital Input 68Analog Input 11/03 Return

35

Digital Input 7

9Analog Input 04

36

Isolated Digital Ground

10Analog Input 12/04 Return37

Isolated Digital Ground

11Analog Input 05

38

Digital Output 7

12Analog Input 13/05 Return

39

Digital Output 6

13Analog Input 06

40

Digital Output 5

14Analog Input 14/06 Return

41

Digital Output 4

15Analog Input 07

42

Digital Output 3

16Analog Input 15/07 Return

43

Digital Output 2

17

Isolated Analog Ground44

Digital Output 1

18Amp Low45

Digital Output 0

19Analog Output 0+46

Dynamic Digital Output

20Analog Output 0 Return47

Isolated Digital Ground

21Analog Output 1+48

External Gate 1

22

Analog Output 1 Return

49

User Counter Output 123

Isolated Digital Ground

50

User Clock Input 1

24

External A/D Trigger

51

Isolated Digital Ground25

External A/D Sample Clock In52

External Gate 026

Isolated Digital Ground

53

User Counter Output 027

Isolated +5 V Out

54

User Clock Input 0

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QuickDAQ

For pacing analog input measurements, you can selecteither the internal clock source provided by the module
or an external clock source. An external clock is usefulwhen you want to pace acquisitions at rates not available
with the internal clock or when you want to pace atuneven intervals. To use an external clock, connect a
TTL‑level signal to the screw terminal of the module
labeled External A/D Sample Clock In. Conversions starton the rising edge of this signal.

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.

Multifunction Counter/Timers
DT9805 and DT9806 modules feature two 32-bit user
counter/timers for event counting, frequency generation(continuous pulse output), one-shot, and repetitive oneshot operations. You can connect or cascade counters
together either in software or by external connections tothe screw terminals of the module. Programmable gates,clocks, and output signals are also supported.

Key Features• QuickDAQ Base Package (Free)
oo Ready-to-measure application software
oo Configure, acquire, log, display, and analyze yourdata
oo Customize many aspects of the acquisition,±500 V Galvanic Isolation Protects Your Data

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• 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

Computers are susceptible to ground-spikes through any
external port. These spikes can cause system crashes andmay even cause permanent damage to your computer.
DT9805 and DT9806 modules feature 500 Volts ofgalvanic isolation to protect your computer from groundspikes and to ensure a reliable stream of data.

User Connections
The DT9805 and DT9806 modules provide pluggablescrew terminal blocks for connecting signals – remove
these blocks for easy wiring. Pin assignments are clearlymarked on the module for quick setup.

PowerAll power is provided through the USB cable to themodule. No external power supply or battery is required.

Cross-Series Compatibility
Virtually all Data Translation DAQ modules arecompatible with the DT-Open Layers® software standard.
This means any application developed with Data
Translation software can easily be upgraded to a new
Data Translation module with little to no reprogrammingneeded.

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Ordering Summary
HARDWARE• DT9805 — USB function module with
16-bit, 50 kS/s analog inputs• DT9806 — USB function module with
16-bit, 50 kS/s analog inputs and two 16-bit
analog outputs
FREE SOFTWARE• QuickDAQ• DAQ Adaptor for MATLAB — Access theanalysis and visualization tools of MATLAB®.
• LV-Link — Access the power of Data
Translation boards through LabVIEW™.

QuickDAQ ships free-of-charge and allows you to get up and running quickly.

OPTIONAL SOFTWARE• QuickDAQ FFT Analysis Option (LicenseRequired)• QuickDAQ Advanced FFT Analysis Option(License Required)

Other Software Options
There are many software choices available for application development,from ready-to-measure applications to programming environments.
The following software is available for use with the DT9805 or DT9806
module and is provided on the Data Acquisition Omni CD:• Device Driver –The device driver allows you to use a DT9805 or DT9806
module with any of the supported software packages or utilities.

• Calibration Utility – This utility allows you to calibrate features of aDT9805 or DT9806 module.

• Quick DataAcq application – The Quick DataAcq application provides
a quick way to get up and running. Using this application, verify key
features of the module, display data on the screen, and save data todisk.
• DT-Open Layers® for .NET Class Library – Use this class library if you
want to use Visual C#® or Visual Basic® for .NET to develop application
software using Visual Studio® 2003-2012; the class library 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 using Windows
10/8/7/Vista/XP 32/64-bit; the DataAcq SDK complies with the DTOpen 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 ofDT‑Open Layers-compliant USB and PCI devices.

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May 2017. Rev 7© Measurement Computing Corporation