58542 VXIbus Universal Power Meter
2-8
Publication 21555, Rev. E, September 2002
2.5.8
Calculate Subsystem Commands
Calculate commands specify and query the configuration of power measurement channels, known in
SCPI references as Software Configuration Channels, and in this publication as “channels”. See
Section 2.5.9 for sensor-specific configuration and measurement function control.
The query form of CALC#?, with # replaced by the channel modifier (1 or 2), returns the current
configuration status for that channel. This verifies configuration commands or return current status
information following data acquisition or power measurements.
Limit Lines are set on a channel basis. These commands set limits, monitor the number of violations,
and allow the violation counter to be cleared.
The REFerence command allows channel-based offset values. For example, using CALC#:REF:COLL
automatically converts the inverse of the current channel measurement value to an offset — simplifying
the 1 dB compression testing of amplifiers.
MIN and MAX commands monitor deviation of measured values over a user controllable time period.
The two software calculation channels can individually and simultaneously perform the internal
instrument functions that calculate final measurement data. The final measurement data is calculated
from Sense subsystem sensor data as well as the Calculate subsystem channel configuration data.
This means that only two measurement configurations can be obtained from the 58542 simultaneously.
For example, the controller can obtain measurements for sensor 1 plus sensor 2/sensor 1 simultaneously,
but not sensor 1 plus sensor 2 plus sensor 2/sensor 1 simultaneously.
Figure 2-4: CALCulate Subsystem Commands
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