Sense SCPs and
Output SCPs
Some SCPs provide input signal conditioning (sense SCPs such as filters
and amplifiers) while others provide stimulus to your measurement circuit
(output SCPs such as current sources and strain bridge completion). In
general, channels at output SCP positions are not used for external signal
sensing but are paired with channels of a sense SCP. Two points to
remember about mixing output and sense SCPs:
1. Paired SCPs (an output and a sense SCP) may reside in separate
HP E1313/E1413s. SCP outputs are adjusted by
*CAL?
to be within
a specific limit. The Engineering Unit (EU) conversion used for a
sense channel will assume the calibrated value for the output channel.
2. Output SCPs, while providing stimulus to your measurement circuit,
reduce the number of external sense channels available to your
HP E1313/E1413.
Figure 2-2 illustrates an example of “ pairing” output SCP channels with
sense SCP channels (in this example, four-wire resistance measurements).
SCP
3
(sense)
SCP
4
(output)
Ch 24
Ch 31
Ch 32
Ch 39
Terminal Module
sense Hi
sense Lo
Note
Each channel line
represents both a
Hi and Lo input.
Figure 2-2. Pairing Output and Sense SCP Channels
Chapter 2
Field Wiring 35
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