Rohde & Schwarz CMU-K20, Operating Manual

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Common: SPECtrum:SWITching CMU-K20/21/22/23/24
1115.6088.12 6.118 E-12
Subsystem SPECtrum:SWITching
The subsystem SPECtrum:SWITching measures and returns the frequency spectum (due to switching)
and compares it with tolerance values. The subsystem corresponds to the graphical measurement
menu
Spectrum.
READ[:SCALar]:SPECtrum:SWITching[:GMSK]? Scalar Results
READ[:SCALar]:SPECtrum:SWITching:EPSK? Start single shot measurement and return results
FETCh[:SCALar]:SPECtrum:SWITching[:GMSK]?
FETCh[:SCALar]:SPECtrum:SWITching:EPSK?
Read measurement results (unsynchronized)
SAMPle[:SCALar]:SPECtrum:SWITching[:GMSK]?
SAMPle[:SCALar]:SPECtrum:SWITching:EPSK?
Read measurement results (synchronized)
Returned values Value range Def. value Def. unit FW vers.
Reference Power,
Matching –100.0 dBm to +100.0 dBm
INV | MATC | NMAT | OUT | NTR | NRAM | OFLW |
UFLW | NTSC | OFF NAN
INV dBm
– V1.20
Description of command
These commands are always queries. They start a measurement and return the results. For more details refer to
the description of measurement control in chapter 5 of the CMU200 operating manual.
The reference power is the absolute carrier power measured as specified in the GSM standard. The following
messages may be output for the value
Matching :
INV invalid
MATC matching
NMAT not matching
OUT out of range
NTR no trigger
NRAM not ramping (burst not found)
OFLW overflow
UFLW underflow
NTSC no training sequence code
OFF off
READ:ARRay:SPECtrum:SWITching[:GMSK]? Spectrum Results
READ:ARRay:SPECtrum:SWITching:EPSK? Start single shot measurement and return results
FETCh:ARRay:SPECtrum:SWITching[:GMSK]?
FETCh:ARRay:SPECtrum:SWITching:EPSK?
Read measurement results (unsynchronized)
SAMPle:ARRay:SPECtrum:SWITching[:GMSK]?
SAMPle:ARRay:SPECtrum:SWITching:EPSK?
Read results (synchronized)
Returned values Description of parameters Def. value Def. unit FW vers.
–100.0 dBm to + 100.0 dBm,
...,
–100.0 dBm to + 100.0 dBm Power at measurement point 1
...
Power at measurement point
n
NAN
...
NAN dBm
...
dBm V1.20
Description of command
These commands are always queries. They return the off-carrier power due to switching at all measurement
points.
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