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USB Data Acquisition Modules for Temperature and Voltage

24-Bit Multifunction USB Data Acquisition Modules for Temperature and Voltage Measurement


Article# OMB-DAQ-2408

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Quantité Prix unitaire
1-4 C$1,134.50
5-9 C$1,077.78
10-24 C$1,055.09
25-49 C$1,009.71
50-99 C$987.02
100+ C$964.33

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Délai de livraison (si pas en stock): 36 semaines
24-Bit Multifunction USB Data Acquisition Modules for Temperature and Voltage Measurement OMB-DAQ-2408 OMB-DAQ-2408
  • Measures Thermocouples or Voltage
  • Up to 16 Analog Inputs
  • 24-Bit Resolution
  • Up to 1 kS/s Sampling

OMB-DAQ-2408 Options de modèles

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Output Type
Number of Outputs
Output Range
Analog Input Type
Analog Input Class
Number of Analog Inputs
Maximum Sample Rate (per sec)
Analog Input Resolution
Input Range
Digital I/O
Interface Protocol

The OMB-DAQ-2408 Series are multifunction DAQ devices designed for highly-accurate voltage or temperature measurements. Each device features up to 16 single ended (SE)/8 differential (DIFF)
analog inputs. Each device includes 8 digital I/O and two counter inputs. The OMB-DAQ-2408-2AO
also features two analog outputs. Each device in the series offers 24-bit resolution for ultra-accurate voltage or thermocouple measurements.

Analog Input
Each device includes 16 SE/8 DIFF analog inputs which you can configure for voltage or thermocouple input on a per-channel basis. Eight software-selectable voltage input ranges are provided. You can configure these ranges on a per-channel basis from ±10V to ±0.078V. When measuring thermocouples, configure analog inputs in DIFF mode. All devices also include open thermocouple detection to identify improperly working thermocouples.

Sample Rate
OMB-DAQ-2408 modules can sample analog input channels at up to 1 kS/s.

Digital I/O
Eight digital I/O channels are included with each OMB-DAQ-2408
and you can read from or write to each individual bit.

Two 32-bit counters are included with OMB-DAQ-2408 modules. The TTL level inputs
are capable of read/write rates of up to 500 Hz and an input frequency of up to 1 MHz.

Analog Output
(OMB-DAQ-2408-2AO Only)

The OMB-DAQ-2408-2AO includes two 16-bit analog outputs. Each output has a ±10V range.
Both outputs can be updated at a rate of up to 500 S/s per channel; one output can be updated
at a rate of 1 kS/s.

The OMB-DAQ-2408 modules ship with an impressive array of software, including the new TracerDAQ®, a full-featured, out-of-the-box data logging, viewing, and analysis application. Driver support and detailed example programs are included for Universal Library programming libraries for Microsoft® Visual Studio® programming languages, and other languages, including DASYLab®, and ULx for NI LabVIEW® (comprehensive library of VIs and example programs compatible with 32-bit and 64-bit LabVIEW v8.5 through 2012) and InstaCalTM installation, calibration and test utility-powerful solutions for programmers and nonprogrammers alike. These modules operate under Microsoft Windows® XP (32-bit only) and VISTA/7/8 (32-bit and 64-bit) operating systems.

A/D Converter Type:
ADS1256, 24-bit Sigma Delta
A/D Data Rates: 3750 S/s, 2000 S/s, 1000 S/s, 500 S/s, 100 S/s,
60 S/s, 50 S/s, 25 S/s, 10 S/s, 5 S/s, 2.5 S/s
Throughput (Software-Selectable
for Single Channel and Multiple Channels)
  Single Channel:
2.5 to 1102.94 S/s
  Multiple Channels: 0.16 to 1102.94 Hz
Number of Channels: Up to 16 channels individually software-selectable
as single ended (SE) or differential (DIFF); thermocouples require differential mode;
for each channel configured as differential, you lose one single-ended channel
Input Isolation: 500 Vdc min between field wiring and USB interface
Channel Configurations: Temperature sensor input,
software-selectable to match sensor type; voltage input
Input Voltage Range
  Thermocouple Mode:
  Voltage Mode (Software-Selectable):
  ±10V, ±5V, ±2.5V, ±1.25V, ±0.625V,
  ±0.3125V, ±0.15625V, ±0.078125V
Absolute Maximum Input Voltage
  CxH-CxL Relative to GND:

  ±22V max (power on), ±10V max (power off)
Input Impedance: 10 M? (power on), 390 ? (power off)
Input Leakage Current: ±20 nA
Input Voltage: >±22V (power on/off): ±1µ A max
Input Capacitance: 590 pf
Maximum Working Voltage (Signal + Common Mode)
  Voltage Mode:
±10.25V max
Common Mode Rejection Ratio
  Thermocouple Mode (fIN = 60 Hz):
110 dB
  Voltage Mode (fIN = 60 Hz, All Input Ranges): 90 dB
ADC Resolution: 24-bits
Crosstalk: Adjacent channels, 100 dB
Input Coupling: DC
Channel Gain Queue: Up to 64 elements, software-selectable channel and range
Warm-Up Time: 45 minutes min
Open Thermocouple Detect: Software-selectable for each channel
CJC Sensor Accuracy
  15 to 35°C: ±0.5°C typ
  0 to 55°C: ±1.0°C max

THROUGHPUT RATE The maximum throughput of an OMB-DAQ-2408 module is 1.1 kS/s aggregate.
The OMB-DAQ-2408 provides the ability to set conversion rates on a per-channel basis. This feature gives the user flexibility and control over noise averaging for each channel.

Digital to Analog Converter:
Number of Channels: 2
Resolution: 16-bits
Output Ranges
  Calibrated: ±10 V
  Uncalibrated: ±10.05V, software-selectable
Output Transient
Host computer is reset, powered on, suspended or a reset command is issued to device
  Duration: 2 s
  Amplitude: 2V p-p
Initial Power On
  Duration: 50 ms
  Amplitude: 5V peak
Differential Non Linearity: ±0.25 LSB typ, ±1 LSB max
Output Current: AOUTx pins, ±5.0 mA max
Power On and Reset State: DACs cleared to zero-scale, 0V, ±50 mV
Settling Time: To rated accuracy, 10V step, 75 µs
Slew Rate: 1.0 V/µ
  Single-Channel: 1000 S/s max, system-dependent
   Multi-Channel: 1000 S/s /#ch max, system-dependent
Calibrated Absolute Accuracy
  Range: ±10V
  Accuracy (±LSB): 16.0

Number of I/O: 8 channels
Configuration: Each DIO bit can be independently read from (DIN) or written to (DOUT).
DIN bits can be read at any time whether the DOUT is active or tri-stated.
Input Voltage Range: 0 to 15V
Input Type: CMOS (Schmitt trigger)
Input Characteristics: 47 k? pull-up/pull-down resistor, 28 ? series resistor
Maximum Input Voltage Range: 0 to 20V max (power on/off, relative to DGND)
Pull-Up/Pull-Down Configuration: All pins pulled up to 5V through individual 47 k? resistors
(the J6 shorting block default position is pins 1 and 2) Pull-down capability is available by
placing the J6 shorting block across pins 2 and 3
Transfer Rate (Software Paced): 500 port reads or single bit reads per second typ
Input High Voltage: 1.3 to 2.2V
Input Low Voltage: 1.5 to 0.6V
Schmitt Trigger Hysteresis: 0.4V to 1.2

Number of I/O:
8 channels
Configuration: Each DIO bit can be independently read from (DIN) or written to (DOUT).
DIN bits can be read at any time whether the DOUT is active or tri-stated.
Output Characteristics: 47 k? pull-up, open drain (DMOS transistor)
internally connected to DGND
Pull-Up Configuration: All pins pulled up to 5V through individual 47 k? resistors
(the J6 shorting block default position is pins 1 and 2).
Transfer Rate (Software Paced)
Digital Output:
500 port writes or single bit writes per second typ
Output Voltage Range: 0 to 5V (no external pull up resistor,
internal 47 k? pull-up resistors connected to 5V by default); 0 to 15V max
Drain to Source Breakdown Voltage: 50V min
Off State Leakage Current: 1.0 µA
Sink Current Capability: 150 mA max (continuous)
per output pin 150 mA max (continuous) for all eight channels
DMOS Transistor On-Resistance (Drain to Source): 4 ?

Pin Names:
Number of Channels: 2 channels
Resolution: 32-bits
Counter Type: Event counter
Input Type: Schmitt trigger, rising edge triggered
Input Source: CTR0 (pin 44), CTR1 (pin 42)
Counter Read/Writes Rates (Software Paced)
  Counter Read: System dependent, 500 reads per second.
  Counter Write: System dependent, 500 writes per second.
Input Characteristics: Each CTRx input pin has 562 k? resistor
pulled up to 5V and a 10 k? series resistor
Input Voltage Range: ±15V max
Maximum Input Voltage Range:
CTR0, CTR1 relative to GND and DGND, ±20V max (power on/off)
Input High Voltage: 1.3 to 2.2V
Input Low Voltage: 1.5 to 0.6V
Schmitt Trigger Hysteresis: 0.4 to 1.2V
Input Bandwidth (-3 dB): 1 MHz
Input Capacitance: 25 pf
Input Leakage Current: ±120 nA @5V, ±1.6 mA @±15V
Input Frequency: 1 MHz, max
High Pulse Width: 500 ns, min
Low Pulse Width: 500 ns, min

4096 bytes isolated micro reserved for sensor configuration,
256 bytes USB micro for external application use

One high-performance 8-bit RISC microcontroller with USB interface (non-isolated);
one high-performance 16-bit RISC microcontroller for measurements (isolated)

Supply Current:
Quiescent current, 275 mA (includes up to 10 mA for the status LED;
does not include any potential loading of the digital I/O bits,
5V user terminal or the AOUTx outputs).
5V User Output Voltage Range: Available at terminal block pin 40, 4.75 to 5.25V
5V User Output Current: Available at terminal block pin 40, 10 mA max
Isolation: Measurement system to PC, 500 Vdc min

USB Device Type:
USB 2.0 (full-speed)
USB Cable Length: 3 m (9.8') max

Operating Temperature Range:
0 to 50°C (32 to 12°F)
Storage Temperature Range: -40 to 85°C (40 to 185°F)
Humidity: 0 to 90% RH non-condensing

127 L × 89.9 W × 35.6 mm D
(5.00 × 3.53 × 1.40")
Weight: 160 g (5.6 oz)


Connector Type: Fixed screw terminal
Wire Gauge Range: 16 to 30 AWG
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Rated 5 out of 5 by from Meets our needs We needed a DAQ with at least 4 channels, 24 bit resolution and better than 10 samples per second. This unit exceeds our need and works better than our previous DAQ from another vendor. The Pro version of the software is also better, and was worth the $200.
Date published: 2021-07-10
Rated 3 out of 5 by from Like anything, knowing how to use it matters Really a 3.5 star product, and I'm a firm critic of things. For the average user of DAQ based control & metrology, this device is not user friendly. However, for operating as an I/O control point in an integrated system, it's good. Digital I/O serve as TTL 5V triggers, reasonably stable analog signals act as voltage references for measurement systems, and the temperature inputs are many in #. They can have some instability in thermal measurement (bummer!) and measurement frequency definitely matters when data logging (you need to run the InstaCal configuration utility to set this up). Your application dictates your needs, so go learn on how to setup things to measure well. One of the downsides is, when connecting to any new PC it often requires you to go setup in InstaCal to establish a baseline configuration before you can use it. Also, the temperature readings are only useful to 0.1°C and nothing deeper. Maybe not the most optimal I/O device out there for the $$, but certainly if you just need an API-ready instrument, this is a good place to start.
Date published: 2020-11-30
Rated 1 out of 5 by from Too low sampling rate The device is not able to reach above 350 Hz of sampling which is low for most scientific experiments.
Date published: 2020-09-23
Rated 2 out of 5 by from Very difficult to use I am trying to replace a Labjack T7 with the DAQ-2408 and find it nearly impossible to understand and use the Universal Library .dll with a Power Basic program. I have not been able to read a voltage or a thermocouple. The 4 different analog input library calls each give a different return value and there seems to be no way of telling which is correct. The reference files do not clearly give the data needed to initialize and startup the 2408. I have used the C, C#, and Visual Basic examples in trying to understand the units to put in a library call. For instance, cbVIn32(BoardNum,chan,Gain,Datavald,Options) has a term Gain. What the value should be I have not been able to locate in the documentation. I have a lot of other comments, too many for this listing. Gerald Hendrickson
Date published: 2018-04-17
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loading all QA

How do I adjust the offset? Temperature is around 3°C off.

Asked by: dimemay
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2023-06-20

I am a Delphi Programmer do you provide an interface library for Delphi.

Asked by: Jaikumar
Thank you for your question. We will require more information to help on this question, please email the DAS team at DAS@OMEGA.COM
Answered by: Application Engineer PV
Date published: 2022-12-09
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