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Features and Functions 2
Agilent U2802A 31-Channel Thermocouple Input User’s Guide 33
Figure 2-6 Ground-referenced and differential signal sources configuration in U2802A
Zero mode: In zero mode, the positive and negative inputs of the
instrumentation amplifier are shorted together. The output of the
instrumentation amplifier is driven out to the corresponding AI channel.
The voltage measured in this mode corresponds to the offset voltage of
the channel. This voltage can be subtracted out of the subsequent
thermocouple mode measurements in order to increase the measurement
accuracy. Do take note that this mode only works for channels that have
been configured to be in the thermocouple mode. Channels configured for
bypass mode will not be affected when this mode is selected.
Each channel is equipped with an open thermocouple detection feature,
where the 10 MΩ resistor is tied to the +15 V power supply rail. This
feature can only be globally enabled or disabled for all channels,
regardless of the channel mode setting. When enabled, outputs of the
channels are set to thermocouple mode where the inputs are left
open- circuited. This causes the positive power supply rail voltage (above
+10 V) to be saturated up, indicating that the channel either has a broken
thermocouple or the thermocouple is not connected. For channels set to
bypass mode, channels with an open- circuited input will also be saturated
to the positive supply rail voltage.
U2802A_UG.book Page 33 Tuesday, January 8, 2008 10:24 AM
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