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 “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.
To Next Page
Loading...
