188 PI-MAX/PI-MAX2 System Manual Version 5.F
Internal Pulser
The PI-MAX incorporates an internal gate pulse generator and high voltage power supply
controlled from an external timing generator, either a PTG or a Stanford Research DG535
Digital Delay/Pulse Generator. The DG535 is controlled from the application software
via a GPIB link.
Note: A DG535 purchased as part of a PI-MAX system will have the Inhibit input
enabled. If you are going to operate the PI-MAX with a DG535 that hasn’t had this input
enabled, it will be necessary to modify the DG535 as required. The modification is
simple and can be easily be made by any qualified technician. Contact the factory for
details.
Gating Speed
Fast Gate Intensifier
Gen II 18 mm: <5 ns FWHM in Start/Stop mode
Gen II 25 mm: <7 ns FWHM
Gen III 18 mm: <10 ns FWHM in Start/Stop mode.
Slow Gate 18 mm: <50 ns FWHM
Slow Gate 25 mm: <100 ns FWHM
Fixed Fast: <2 ns FWHM - 18 mm Gen II
<5 ns FWHM - 18 mm Gen III
Propagation Delay: 12 ns. Note that this is only the delay of the internal pulser. The
timing generator’s insertion delay, 25 ns for the PTG, 85 ns for the Stanford
Research DG535, must be considered as well.
Jitter: <100 ps
Maximum Repetition Rate (photocathode)
Sustained: 50 kHz in variable mode; 5 kHz @ 2 ns
Burst: 250 kHz (bursts of 50 pulses)
Maximum Repetition Rate (MCP bracket pulsing): 5 kHz, (drops pulses if input
rate exceeds 5 kHz)
Start/Stop Inputs: Both are 0 to +5V rising edges, 50 , compatible with the Stanford
Research DG535 and applied via Timing Gen connector.
MCP Bracket Pulsing: MCP requires 500 ns to gate On and 200 ns to gate Off.
Note: Bracket pulsing only applies to units having a Gen II Image Intensifier. In
the case of units having a Gen III Image Intensifier, bracket pulsing does not
apply.
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