Agilent Technologies U2802A User Manual
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Features and Functions
24
Agilent U2802A 31-Channel Thermocouple Input User’s Guide
Bypass mode:
In bypass mode, the TCn+ input is routed directly to the
corresponding AI channel on Rear Connector 1. The single- ended signals
tied to TCn+ should be referenced to a GND pin, and not to the TCn
–
input, as it is not directly connected to GND. The signal connection will
depend on the type of source used.
For floating signal sources, all input signals are connected to the ground
in the U2802A as illustrated in Figure 2- 3. However, it is not
recommended to tie ground- referenced signal sources in this manner. Any
potential differences between the signal source ground and the U2802A
ground could potentially induce excessive current to flow through the
ground wires causing the wires and module to be damaged.
Figure 2-5
Floating signal source configuration in U2802A
For ground- referenced signal sources and differential signal sources, the
configuration in Figure 2- 6 is recommended. Take note that the
corresponding DAQ channel will need to be configured as a DIFF input to
enable this type of connection.
U2802A_UG.book Page 24 Friday, November 25, 2011 10:57 AM