Status Reporting System CMU
1100.4903.12 5.22 E-8
STATus:OPERation Register
The CMU offers 30 independent STATus:OPERation:CMU:SUM1|2:CMU<nr> sub-registers (<nr>=1 ...
15) which are implemented in hierarchical form. The bits of the 30 STATus:OPERation registers are set
only after the registers are assigned to a function group and measurement mode (see p. 5.18).
In the EVENt part, the STATus:OPERation register contains information on which actions the instru-
ment has executed since the last readout. All five parts of the registers can be read using one of the
commands of the subsystem STATus:OPERation:CMU:SUM1|2:CMU<nr>:... . Moreover, the
EVENt part can be enabled and read by means of the STATus:OPERation:SYMBolic... com-
mands, see section Symbolic Status Event Register Evaluation on page 5.25 ff.
The bit assignment for the CMU base system which is always assigned to the ...SUM1:CMU1 sub-
register (secondary address 0) is as follows:
Table 5-4 Meaning of the bits used in the STATus:OPERation:CMU:SUM1:CMU1
sub-register assigned to the CMU base system
Bit-No. Meaning Symbol in
STATus:OPERation:SYMBolic...
4
Measurement Result is Invalid
This bit is set if a measurement caused invalid results, e.g. because of
no input signal was available (see also application example below and
section Retrieving Measurement Results on p. 5.35 ff.).
MINV
6
Reference Frequency Not Locked
This bit is set if synchronization to the reference frequency failed (e.g.
because of a missing or faulty external reference frequency). The CMU
checks the synchronization approx. once per second and updates the
RFNL bit. Alternatively, the synchronization can be queried via
[SENSe:]SYNChronize:FREQuency:REFerence:LOCKed? (see
Chapter 6)
RFNL
For function group RF Non Signalling, the bit assignment is as follows:
Table 5-5 Meaning of the bits used in the STATus:OPERation:CMU:SUM1|2:CMU<nr>
sub-register assigned to RF Non Signalling
Bit-No. Meaning Symbol in
STATus:OPERation:SYMBolic...
0
Overload
This bit is set if the currently used input connector is overloaded.
IOV
4
Measurement Result is Invalid
This bit is set if a measurement caused invalid results, e.g. because
no input signal was available (see also application example below
and section Retrieving Measurement Results on p. 5.35 ff.).
MINV
11
RF Input Overdriven
This bit is set if the RF input level at connector RF1, RF2 or RF 4 IN
is larger than the specified RF Max. Level plus an appropriate mar-
gin.
RFIO
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