Keysight Technologies 86120B, User Manual

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95
Programming
Making Measurements
The format of returned data
Measurements are returned as strings
All measurement values are returned from the Keysight 86120B as ASCII strings.
When an array is returned, the individual values are separated by the comma charac-
ter.
Determine the number of data points
When a FETCh, READ, or MEASure command is used (with ARRay specified), the
first returned value indicates the total number of measurement values returned in the
query.
If you use the:CALCulate1:DATA?, :CALCulate2:DATA?, or :CALCulate3:DATA?
queries to query data, send the :POINts? query first to determine the number of val-
ues returned in the string. The string does not contain a first value which specifies
the string length. This is shown in the following example:
OUTPUT 720;”:CALCulate1:POINts?”
ENTER 720;Length
OUTPUT 720;”:CALCulate1:DATA?”
ENTER 720;Result$
Data can be corrected for elevation and vacuum
Normally, the Keysight 86120B provides measurement values calculated for condi-
tions in air at sea level. Use the :SENSe:CORRection:ELEVation command to com-
pensate for air dispersion. Altitudes up to 5000 meters can be entered. Use the
:SENSe:CORRection:MEDium command to switch to readings in a vacuum.
Amplitude units
The default amplitude units are dBm. If you need measurements in watts, use the
:UNIT:POWer command. When the Keysight 86120B is turned on, the amplitude
units are automatically set to the units used before the instrument was last turned off.