User`s guide

53220A/53230A User’s Guide 135
53220A/53230A Input Signal Conditioning 4
The frequency parameter values are:
A frequency setting of 10 kHz decreases the auto-level period for all frequen-
cies >
10 kHz. A frequency setting of 50 Hz provides auto-leveling for fre-
quencies down to 50 Hz. The frequency selected should be based on the
lowest expected frequency in the measurement.
The auto-level frequency is a system setting which applies to all counter chan-
nels, and should be noted when making two-channel measurements.
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
Interface
Frequencies
>
10 kHz
Frequencies
50 Hz to < 10 kHz
Front Panel Fast Slow
SCPI
10.0E3
Maximum
50.0
MINimum