Agilent Technologies EPM-P Series Programming Manual page 177

Measurement Commands
FETCh[1]|2|3|4[:SCALar][:POWer:AC]:DIFFerence? [<expected_value>[,<resolution>[,<source list>]]]
Item
source list
1. The mnemonic
parameter used in the command sub-systems. The parameters must be entered in
the specified order. If parameters are omitted, they will default from the right. The
parameter DEFault is used as a place holder. Specifying
value unchanged.
2. When the measurement result is linear this parameter represents the number of
significant digits. When the measurement result is logarithmic 1 to 4 represents a
resolution of 1, 0.1, 0.01 and 0.001 respectively.
3. E4417A only.
Example
FETC2:DIFF?
Error Messages
• If the last measurement on either channel is not valid error -230, "Data
corrupt or stale" occurs. A measurement is valid after it has been
initiated. It becomes invalid when either a reset occurs or any
measurement parameter, for example frequency, is changed.
• If the expected_value and resolution parameters are not the same as
the current expected value and resolution settings on the specified
window, error -221, "Settings conflict" occurs.
2-30
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Description/Default
This channel list specifies the
channels used to calculate the
difference.
If unspecified and the current
window setup is a difference
measurement then this difference
setup is used, otherwise it defaults
to channel A-B (E4417A) or A-A
(E4416A).
DEF means DEFault. This is not equivalent to the DEFault
This command queries the
difference measurement on the
lower window.
EPM-P Series Power Meters Programming Guide
Range of Values
3
(@1),(@2)
3
(@2),(@1)
(@1),(@1)
3
(@2),(@2)
DEF leaves the parameter