Start Only
An External Start/Stop pulse starts acquisition. Acquisition is first armed by pressing
the Start button. Then the signal level triggers the start of acquisition. If acquisition is
active, subsequent pulses are ignored.
Stop Only
An External Start/Stop pulse stops acquisition. While Acquisition is active, then the
signal level triggers the stop of acquisition. If acquisition is not active, subsequent
pulses are ignored.
Start and Stop
If acquisition is inactive but armed, External Start/Stop pulse starts acquisition. If ac
-
quisition is active, External Start/Stop pulse stops acquisition.
Suspend & Resume
If acquisition is inactive, External Start/Stop pulse starts acquisition. Subsequent
pulses may be used to suspend and resume acquisition.
Polarity
Select the PHA ACQ SS input signal Polarity: Positive or Negative.
Coincidence
Coincidence is the ability to qualify the recording of incoming events. A qualifying
(gate) signal must arrive within a time window which is selectable by the user.
The gate input signal at the COINC/ANTI connector of the instrument determines
which incoming signals are recorded. Events which do not meet the qualification re
-
quirements are not recorded.
Using MCA Definition Tables
User’s Manual 43
Figure 40 - Coincidence Parameters (in Acquire Setup)
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