53210A Input Signal Conditioning
4
Keysight 53210A User’s Guide
115
LEVel
sets the relative threshold for all measurements.
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%
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 “
”).
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
shows a scale of how relative thresholds apply to the input signal.
Содержание 53210A
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