User`s guide

53220A/53230A User’s Guide 129
53220A/53230A Input Signal Conditioning 4
Threshold Level and Sensitivity
The threshold level is the trigger (input) level at which the counter begins the
signal count (i.e. measurement). This level is the center of the hysteresis band
- the band which represents counter sensitivity. For a count to occur, the sig-
nal must cross the upper and lower limits of the band in opposite directions
(polarities). Figure 4-4 identifies these characteristics and conditions of the
input signal. The dynamic range of the input signal is indicated on the front
panel.
Figure 4-4. Input Signal Threshold Level and Sensitivity.
V
U
V
L
V
C
signal operating range
trigger point
reset point
Hysteresis band
(p-p sensitivity)
threshold level
INPut{1|2}:SLOPe{1|2}
INPut{1|2}:LEVel{1|2}
SYSTem:ALEVel:FREQuency
INPut{1|2}:LEVel{1|2}:AUTO
INPut{1|2}:LEVel{1|2}:RELative
INPut3:BURSt:LEVel
INPut{1|2}:NREJect
positive slope
negative slope
dynamic range
front panel dynamic range indicator
INPut{1|2}:LEVel:MAXimum?
INPut{1|2}:LEVel:MINimum?
INPut{1|2}:LEVel:PTPeak?
0