Agilent Technologies U2802A Betriebsanweisung PDF herunterladen (Seite 35)

Features and Functions 2

Keysight U2802A 31-Channel Thermocouple Input User’s Guide 23

The major functional blocks of the U2802A module are:

• Analog input channel circuitry

• Cold junction sensor

• Digital control logic

• EEPROM

Analog input channel circuitry

The analog circuitry for each channel consists of an instrumentation

amplifier with a fixed gain of 97.673, a 4 Hz RC low- pass filter, and an

output buffer. The multiplexers at the input and output of each channel

allows each channel to be configured for three modes of operation as

listed below:

Thermocouple input mode: In thermocouple mode, the thermocouples (or

any floating voltage source) should be connected to the TCn+ and TCn–

terminals as illustrated in Figure 2- 4. All TCn– terminals are internally

tied to module ground with a 10 MΩ resistor. The TCn+ and TCn– signals

are routed to the differential inputs of the instrumentation amplifier.

Differential voltage signals at the TCn+ and TCn– terminals are amplified,

filtered and driven out by single- ended output voltage to the

corresponding AI channel on Rear Connector 1.

Figure 2-4 Functional block diagram for thermocouple mode in U2802A

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Agilent Technologies U2802A Betriebsanweisung Seite 35