53220A/53230A Math, Graphing, and Data Logging 6
Keysight 53220A/53230A User’s Guide 209
Using the scale functions
The counter scaling functions include null, percent change (PCT), part per million
change (PPM), part per billion change (PPB), and scale (Mx-B). The function 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 difference
between the measurement and the reference value, expressed in parts per million.
PPB - performs a parts per billion change operation. The result is the difference
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.
Scaling function results must be in the range of -1.0E+24 to -1.0E-24, 0.0, or
+1.0E-24 to 1.0E+24. Results outside these limits will be replaced with
-9.9E+37 (negative infinity), 0, or +9.9E+37 (positive infinity).
Following a reset (*RST) or instrument preset (SYSTem:PRESet), the scaling
function is set to NULL.
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