MEASurement Commands 2
N1911A/1912A P-Series Power Meters Programming Guide 151
READ[1]|2|3|4[:SCALar][:POWer:AC]:DIFFerence?
[<expected_value>[,<resolution>[,<source list>]]]
This command sets the specified window’s measurement function to difference
mode with relative mode off, aborts then initiates both Channel A and B,
calculates the difference measurement result and places the result on the bus.
The result is a power based measurement and is expressed in the units defined by
UNIT[1]|2|3|4:POWer.
Syntax
Parameters
Refer to “Optional Parameters” on page 112 for additional details on the
parameters in this command.
INITiate:CONTinuous must be set to OFF on both channels, otherwise error
–213, “INIT ignored” occurs. If TRIGger:SOURce is set to BUS on either channel,
error –214, “Trigger deadlock” occurs.
:POW
:AC
?
:SCAL
:DIFF
Space
expected_value
DEF
resolution
,
DEF
source list
,
READ
1
2
3
4
Item Description/Defaul t Range of Values
expected_value
(for the expected power
level)
The power meter ignores the numeric value entered in this
parameter. Any value entered is treated like DEF.
sensor dependent
DEF
[a]
resolution A numeric value for the resolution. If it is unspecified the current
resolution setting is used. If a value is entered it should correspond
to the current resolution setting otherwise an error occurs.
1 to 4
[b]
1.0, 0.1, 0.01, 0.001
DEF
[a]
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