14
PG-200 Operation Manual
Version 2.D
Gate width skew:
at 3-14 nsec widths:
2 nsec
at 15-199 nsec widths:
3 nsec
at 200+ nsec widths:
4 nsec or 0.1% whichever is greater
Serial interface:
RS232-C, 1 start bit, 8 data bits, 1 stop bit, no parity, 9600 baud.
Battery backed-up memory:
Data retention is good for 10 years under normal
conditions.
Operating environment:
20-30°C, relative humidity 10-80%
Size: 3.5
H, 17 W, 13 D
Weight: 17 lb.
Power: 95-130 V RMS, 210-260 V RMS
50-60 Hz
200 VA maximum
Hardware Overview
The PG-200 contains at least three PC boards, depending on the options purchased with
it. The three basic boards are the Processor, Front Panel and Pulser Boards. Also inside
the case are a line filter, power supply transformer, and a power line disconnect safety
switch.
Never rely on the power line safety switch to turn off the high voltage inside the pulser.
Always disconnect the line cord and wait at least 5 minutes before removing the PG-200
covers. The extra time is needed to discharge the high voltage capacitors to safe levels.
The Processor Board contains the power supply for all the system logic plus a
programmable high voltage power supply for gate pulses. The high voltage power supply
must be adjusted for different gate pulse widths to maintain relatively constant gate pulse
amplitudes. If a high voltage overload condition occurs, the supply is disabled and can
only be re-enabled by turning power off then turning power back on. If the problem
persists, power should remain off until it is resolved. Also included on the Processor
Board is a microprocessor with EPROM and battery backed up RAM, 8 channel ADC, 4
channel DAC, timers, counters, serial interface, auxiliary delayed trigger output,
keyboard controller, parallel I/O registers, internal ambient temperature monitor, and
crystal clock references.
The Front Panel Board contains control circuitry for all front panel functions including
key switches, alpha-numeric display, BNCs, slide switches, LEDs, etc. Other circuitry
includes delay generators, a 100 MHz oscillator, buffers for BNC outputs, etc. The 100
MHz oscillator serves as the PG-200 time base for gate pulse timing, delay out timing,
etc. It can be calibrated for temperature drifts by comparing its frequency against the
microprocessor crystal frequency.
The Pulser Board contains the pulse shaping circuitry to produce the high voltage gate
pulses. It receives timing information from the Front Panel Board. If a system requires
DANGER
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