53220A/53230A User’s Guide 197
53220A/53230A Math, Graphing, and Data Logging 6
Using the Scale Functions
The counter scaling functions include null, percent change (PCT), part per mil-
lion change (PPM), part per billion change (PPB), and scale (Mx-B). The func-
tion is selected with the command:
CALCulate[1]:SCALe:FUNCtion {NULL|PCT|PPM|PPB|SCALe}
CALCulate[1]:SCALe:FUNCtion? (query form)
NULL - performs a null operation. The result is the measurement minus the
reference value. (See “Scale Reference Value” for information on setting the
reference).
PCT - performs a percent change operation. The result is the difference
between the measurement and the reference value, expressed in percentage.
PPM - performs a parts per million change operation. The result is the differ-
ence between the measurement and the reference value, expressed in parts
per million.
PPB - performs a parts per billion change operation. The result is the differ-
ence between the measurement and the reference value, expressed in parts
per billion.
SCALe - performs an Mx-B operation. The result is the measurement (x)
multiplied by the gain value M (CALCulate1:SCALe:GAIN command) minus
the offset value B (CALCulate1:SCALe:OFFSet). If
CALCulate1:SCALe:INVert is enabled (On), the measurement will first be
inverted (1/x), resulting in a M/x-B operation.
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