130 53220A/53230A User’s Guide
4 53220A/53230A Input Signal Conditioning
Specifying an Absolute Threshold Level
The input threshold level can be specified as an absolute value. An absolute
level is set with the command:
INPut[{1|2}]:LEVel[{1|2}][:ABSolute] {<volts>|MINimum|
MAXimum|DEFault}
INPut[{1|2}]:LEVel[{1|2}][:ABSolute]? [{MINimum|MAXimum|
DEFault}] (query form)
Absolute threshold levels for the input ranges are:
• 5V range: ± 5.125V (2.5 mV resolution)
• 50V range: ± 51.25V (25 mV resolution
• 500V range (w/10:1 probe): ± 512.5V (250 mV resolution)
LEVel/LEVel1 sets the absolute threshold for all measurements except
rise/fall time and single-channel time interval. For rise/fall time measure-
ments, LEVel/LEVel1 sets the lower reference and LEVel2 sets the upper
reference. For single-channel time interval, LEVel/LEVel1 sets the absolute
threshold for the start event and LEVel2 sets the threshold for the stop event.
Setting an absolute level disables the counter’s auto-level function.
CONFigure and MEASure enable auto-leveling and set the threshold to 50%. A
reset (*RST) or front panel preset (Preset) also enables auto-leveling and sets
the threshold to 50%.
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