53220A/53230A Input Signal Conditioning 4
Keysight 53220A/53230A User’s Guide 147
The default setting is 50 Hz. The value is stored in non-volatile memory and does
not change when power is cycled or following a reset (*RST) or a front panel
preset (Preset). CONFigure and MEASure enable auto-level and set a relative
threshold of 50%, but do not change the auto-level frequency.
System auto-level range example
CONF:FREQ 100E6, (@1) // measure 100 MHz signal
SYST:ALEV:FREQ 10.0E3 // set auto-level frequency
INP:IMP 50 // set impedance to 50 ohms
INP:RANG 5 // set range to 5V
INP:COUP AC // set AC coupling
INP:LEV:REL 65 // set 65% relative threshold
Burst measurement detector threshold
All 53230A burst measurements are relative to the pulse width. The ‘on’ portion of
the pulse width is established by a -6 dB and -12 dB detector threshold.
Figure 4-6 is an example of the thresholds relative to the peak amplitude of the
burst signal.
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