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.
INITiate:CONTinuous must be set to OFF on both channels, otherwise error
NOTE
–213, "INIT ignored" occurs. If TRIGger:SOURce is set to BUS on either channel,
error –214, "Trigger deadlock" occurs.
Syntax
READ
1
2
3
4
Parameters
Refer to
parameters in this command.
Item
expected_value
(for the expected power
level)
resolution
N1911A/1912A P-Series Power Meters Programming Guide
:POW
:SCAL
expected_value
Space
"Optional Parameters"
Description/Defaul t
The power meter ignores the numeric value entered in this
parameter. Any value entered is treated like DEF.
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.
:AC
:DIFF
,
DEF
on page 112 for additional details on the
MEASurement Commands
?
,
resolution
DEF
Range of Values
sensor dependent
[a]
DEF
[b]
1 to 4
1.0, 0.1, 0.01, 0.001
[a]
DEF
2
source list
151