53220A/53230A Input Signal Conditioning 4
Keysight 53220A/53230A User’s Guide 143
When auto-level is enabled, the threshold level is specified as a percentage (%) of
the peak-to-peak input voltage (see “Setting relative threshold levels”).
The CONFigure and MEASure commands enable auto-leveling and set a 50%
threshold level. A reset (*RST) or front panel preset (Preset) also enables
auto-leveling at a 50% threshold level.
Setting relative threshold levels
Relative threshold levels are percentages of the peak-to-peak input signal
amplitude. Relative thresholds are set with the command:
INPut[{1|2}
]:LEVel[{1|
2}]:RELative
{<percent>|M
INimum|MAXi
mum|DEFault}
INPut[{1|2}]:LEVel[{1|2}]:RELative? [{MINimum|MAXimum| DEFault}]
(query form)
Threshold values are from 10% to 90% with 5% resolution. In order to specify a
relative threshold level, auto-level must be enabled.
LEVel/LEVel1 sets the relative 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 relative threshold for the
start event and LEVel2 sets the threshold for the stop event.
CONFigure and MEASure set the threshold to 50% and enable auto-leveling. A
reset (*RST) or front panel preset (Preset) also sets the threshold to 50% and
enables auto-leveling.
Relative threshold example
//set a relative trigger threshold
CONF:FREQ 1E6, 0.1, (@1) // measure 1 MHz signal
INP:IMP 50 // set impedance 50 ohms
INP:RANG 5 // set range to 5V
INP:COUP AC // set AC coupling
INP:LEV:REL 30 // threshold level at 30%
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