Agilent Technologies 53181A - Page 111

Chapter 2 Operating Your Frequency Counter
Using CHANNEL 1 Input Conditioning Keys
Operating Guide 2-43
2
If the signal peaks do not exceed beyond both hysteresis limits, the input signal will
not generate a count. For example, the peak-to-peak amplitude is insufficient, or
trigger level is set above or below the midpoint of the input signal as shown in the
following figures.
Signal will not generate a count because the peak-to-peak amplitude of
the signal is insufficient.
Signal will not generate a count because the trigger level is set below
the midpoint of the signal, causing the lower hysteresis level to not be
crossed.
Trigger
Level
Upper
Hysteresis
Level
Peak-to-Peak
Sensitivity
Lower
Hysteresis
Level
Input signal
to Counter
Upper
Hysteresis
Level
Peak-to-Peak
Sensitivity
Trigger
Level
Lower
Hysteresis
Level
Input signal
to Counter