Agilent Technologies U2802A User Manual download pdf (Page 37)

37

U2802A

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.

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