53210A Input Signal Conditioning 4
Keysight 53210A User’s Guide 119
ON enables noise rejection, thus increasing hysteresis and decreasing sensitivity
by 50%. This setting should be used when noise is present in the signal
environment. However, if the threshold level is close to a peak amplitude (positive
or negative), a count will not occur if the signal does not cross both hysteresis
levels due to the increased hysteresis band.
OFF disables noise rejection which
decreases hysteresis and increases sensitivity.
CONFigure and MEASure do not change the noise rejection setting. Following a
reset (
*RST) or instrument preset (Preset), noise rejection is disabled (off).
Noise Rejection from Bandwidth Limiting For input signals up to 100 kHz,
reducing the counter’s bandwidth from 350 MHz to 100 kHz (see “Bandwidth
Limiting (Low-Pass) Filter”) also provides noise rejection. Additional noise
rejection for frequencies in this range is then obtained through
INPut:NREJection
ON
.
Noise Rejection Example
//period measurement of expected 10 MHz signal,
//use channel 1
CONF:PER 0.1E-6,.001,(@1)
INP:IMP 1.0E6 //set impedance to 1 Mohm
INP:RANG 50 //set range to 50
INP:COUP AC //set AC coupling
INP:LEV 3 //set 3V threshold level (absolute)
INP:NREJ ON //enable noise rejection
Threshold Slope
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