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Appendix B PTG Module 69
External: Each trigger applied to Ext. Trig. In BNC initiates a pulse ensemble that is
applied to PI-MAX.
Readout Cycle: Readout cycle is triggered through the ST-133 backplane if Int. Sync.
is selected on Experiment Setup Timing tab page.
Enabling: Handshakes that prevent a readout from occurring while the PTG is busy and
that prevent the PTG from pulsing the photocathode ON while a readout cycle is in
progress are performed through the backplane.
External Trigger:
Levels: -6 V to + 6 V DC
External Level Resolution: 48 mV
Slope: selectable.
Coupling: AC and DC selectable.
Input Hysteresis: 100 mV
Repetition Rate: up to 1 MHz
Bandwidth: 700 MHz
Internal Trigger:
Repetition rate:
minimum: 0.1 Hz
maximum: 1 MHz
resolution: 12.5 ns
Timing
Trigger gate start delay:
minimum: 24 ns
maximum: 20 ms
*
resolution: 0.04 ns
Gate Pulse width:
minimum: 0.0 ns
maximum: 20 ms
*
resolution: 0.04 ns
Trigger to Auxiliary delay:
minimum: 24 ns
maximum: 10 ms
resolution: 0.04 ns
*
start delay + gate width = 20 ms maximum