4 53220A/53230A Input Signal Conditioning
142 Keysight 53220A/53230A User’s Guide
Absolute threshold levels for the input ranges are:
– 5 V range: ± 5.125 V (2.5 mV resolution)
– 50 V range: ± 51.25 V (25 mV resolution
– 500 V range (w/10:1 probe): ± 512.5 V (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 measurements, 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%.
Using auto-level
Automatic setting of the input threshold level is based on the positive and
negative peaks of the input signal. Auto-level is enabled with the command:
INPut[{1|2}]:LEVel[{1|2}]:AUTO {OFF|ON|ONCE}
INPut[{1|2}]:LEVel[{1|2}]:AUTO? (query form)
OFF disables auto-leveling; ON enables auto-leveling. Auto-level ONCE
immediately sets an auto-level and then disables auto-leveling.
If auto-leveling is enabled, querying the absolute level on the current
measurement channel returns the corresponding threshold voltage. If the
channel is not the measurement channel, 9.91E+37 (not a number) is returned.
Level2 can only be queried for rise/fall time and single-channel time interval
measurements. Querying Level2 during other measurement functions returns
9.91E+37 (not a number).
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