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Remote Control
R&S
®
CMW500
146
User Manual 1173.9463.02 ─ 02
. A typical application is the limit check, where the error indicators are
set to one of the following values:
●
OK
: The result is located within the limits or no limit has been defined/enabled for this
result.
●
ULEU
(User limit exceeded upper): An upper limit is violated. The result value is
located above the limit.
●
ULEL
(User limit exceeded lower): A lower limit is violated. The result is located below
the limit.
The
CALCulate...?
command returns exactly the same number of results as the cor-
responding
FETCh...?
command, including the reliability indicator as first value.
Return Values NCAP, NAV and INV
If no valid result is available, the value returned by
FETCh...?, READ...?
and
CALCulate...?
depends on the reason for the unavailability. Possible values are
NCAP ("Not Captured"), NAV ("Not Available") and INV ("Invalid"). For each unavailable
result value one of these values is returned.
The following table provides some examples.
Situation
Returned Value
Measurement state OFF
NAV returned by
FETCh...?
and
CALCulate...?
Disabled view
NCAP returned by
FETCh...?
and
CALCulate...?
Unsuitable settings for a certain part of the measurement.
Example: The measurement of some results requires a spe-
cific trigger type.
NCAP returned by
FETCh...?
,
READ...?
and
CALCulate...?
Object to be measured not available in signal (e.g. certain
physical channel missing)
NCAP returned by
FETCh...?
,
READ...?
and
CALCulate...?
Underflow, Overflow, Sync Error, Trigger Timeout
INV returned by
FETCh...?
,
READ...?
and
CALCulate...?
Retrieving Single Values and Traces
The R&S CMW500 provides two different types of measurement results:
●
Tables or output fields contain a (usually) small number of single, mostly statistical
values. Many of these values are relevant for limit checks. For these values
CALCulation...?
commands are provided.
●
Traces in diagrams consist of a larger number of measurement points. They usually
depend on a parameter such as the time or frequency.
Single results and traces can be retrieved separately. To distinguish the result type, the
mnemonic :
TRACe
is included in the commands headers:
FETCh:<FWA>:<Context>:<View>:<Statistics>...?
READ:<FWA>:<Context>:<View>:<Statistics>...?
CALCulate:<FWA>:<Context>:<View>:<Statistics>...?
Control of the Instrument