198 53220A/53230A User’s Guide
6 53220A/53230A Math, Graphing, and Data Logging
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 infin-
ity).
Following a reset (*RST) or instrument preset (SYSTem:PRESet), the scaling
function is set to NULL.
Scale Reference Value
The NULL, PCT, PPM, and PPB scaling functions require a reference value. For
PCT, PPM, and PPB the value cannot be ‘0’.The reference can be obtained auto-
matically or specified directly with the commands:
CALCulate[1]:SCALe:REFerence:AUTO {OFF|ON}
CALCulate[1]:SCALe:REFerence:AUTO? (query form)
CALCulate[1]:SCALe:REFerence {<reference>|MINimum|MAXimum|
DEFault}
CALCulate[1]:SCALe:REFerence? [{MINimum|MAXimum|DEFault}]
(query form)
ON
- automatically selects the first measurement as the reference for all subse-
quent readings in the reading count (trigger count x sample count). OFF dis-
ables automatic selection and requires the reference to be specified directly.
Following a reset (*RST) or instrument preset (SYSTem:PRESet), automatic
reference selection is enabled (ON).
<reference> - specifies the reference value directly. The reference is used
for all readings in the reading count.
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