Remote Control
R&S
®
CMW500
144User Manual 1173.9463.02 ─ 06
Performance considerations, multi evaluation measurements
The READ...? query is view-specific and calculates only the results needed for a par-
ticular view. This can result in a performance improvement compared to the context-
specific command sequence INITiate...; FETCh...?
In contrast to FETCh...? queries, READ...? commands also provide valid results for
disabled views in multi evaluation measurements; see Retrieving results for disabled
views.
CALCulate...? Command
Waits until the end of the current measurement cycle (if the measurement is running) and
returns the limit check results including the Reliability and Error Indicators.
CALCulate...? analyzes the results that would be returned by the corresponding
FETCh...? Command and returns the single-value error indicators, see Error Indicators
for Single Results. 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...?
Control of the Instrument
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