4 53220A/53230A Input Signal Conditioning
144 Keysight 53220A/53230A User’s Guide
Measuring low frequency signals
For all counter functions, auto-level should not be used for frequencies <50 Hz.
Threshold levels should be set using absolute values (see “Specifying an absolute
threshold level”).
The MEASure command should not be used with frequencies less than 50 Hz as
the command configures the counter (including enabling auto-level) and makes
an immediate measurement.
For frequencies in this range, use the CONFigure command and turn off
auto-level by specifying an absolute threshold level. For example:
//measure a 10 Hz signal
CONF:FREQ 10, (@1) // measure 10 Hz signal
INP:IMP 50 // set impedance to 50 ohms
INP:RANG 5 // set range to 5V
INP:COUP AC // set AC coupling
INP:LEV 1 // 1V threshold, turns off auto-level
INIT // take reading
Input coupling and threshold levels
Figure 4-5 shows a scale of how relative thresholds apply to the input signal.
When the signal includes a DC offset, the absolute value of a relative threshold is
a function of the input coupling (AC or DC).
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