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Sense SCPs and
Output SCPs
Chapter 2
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 E1415s. 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 E1415.
Figure 2-2 illustrates an example of "pairing" output SCP channels with sense
SCP channels (in this example, four-wire resistance measurements).
Figure 2-2. Pairing Output and Sense SCP Channels
Field Wiring
33
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