Giga-tronics 8650A Series, Operation Manual

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Remote Operation
Manual 31470, Rev. E, April 2001 3-7
3.2.6 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 manual as “channels”. See
Section 3.2.7 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 8650A 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 3-2: CALCulat Subsystem Commands
Channel
Configuration
CALC
ulate
POW
er
RAT
io
STAT e
DIFF
erence
UNIT
[:CHAN:FUNC]?
LIM
it
UPP
er
LOW er
FAIL
?
FCO
?
CLE
ar
STAT
e
REF
erence
STAT
e
COLL
ect
MAX
imum
STAT
e
MIN
imum
STAT
e