Keysight Technologies U2651ADigital I/O USB data capturing module U2651A OPT 902 + ABD Ficha De Dados

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Thermocouple input mode

In thermocouple input mode, the 
U2802A can acquire up to ±100 mV 
input signals. Each channel includes 
an instrumentation amplifier and a 
4 Hz low-pass filter. The low-pass 
filter removes unwanted noise from 
the thermocouple wires to obtain 
accurate measurement data.

Voltage input mode

Alternatively, you can select separate 
voltage input modes for each channel. 
The channel will be set to bypass the 
amplifier and filter, allowing up to ±10 
V input signals to be directly routed 
to the DAQ device analog input. The 
bandwidth in this mode is more than 
500 kHz.

Zero mode

In zero mode, the positive and 
negative inputs of the instrumentation 
amplifier are shorted together. The 
voltage measured in this mode 
corresponds to the offset voltage 
of the channel. You can subtract 
this offset voltage from subsequent 
thermocouple mode measurements 
to increase measurement accuracy. 
This mode is only applicable in 
thermocouple mode.

Thermocouple compatibility

The U2802A is compatible with a 
wide range of standard thermocouple 
types defined in the NIST ITS-90 
Thermocouple Database. This 
includes types J, K, R, S, T, N, E, and 
B.

Open thermocouple detection

The U2802A includes open 
thermocouple detection circuitry to 
indicate the presence of an open 
thermocouple. 

Calibration EEPROM

The U2802A gain and offset 
calibration factors for each 
channel are stored in the EEPROM 
during factory calibration and 
can be retrieved prior to taking 
measurements. This on-board 
EEPROM also stores the module ID, 
serial number, and date of calibration 
for your reference. A section of the 
EEPROM is also allocated for you to 
save your calibration data.

Restoring factory calibration

Using the AMM software, you can 
easily restore the U2802A calibration 
data from your settings to the original 
factory settings.