Introduction
15
two high voltage gate outputs, two Pulser Boards are installed, each board getting the
same timing signals so that both gate pulses occur simultaneously. Both Pulser Boards
should be specially calibrated for proper parallel operation, i.e. they must be calibrated
with each other for minimum gate pulse delay and width skews. Additionally the Pulser
Board contains a gate monitor circuit which is basically a capacitive divider. The divider
produces a faithful replica of the gate pulse, however, the monitored pulse appears
distorted since it is derived from the gate pulse at the PG-200 rear panel connector and
not at the detector. The PG-200 was designed to produce proper pulses for Princeton
Instruments detectors and this apparent distortion does not affect detector performance in
any way. The monitor pulse is only useful as a high impedance oscilloscope timing
reference.
Before Operating the PG-200
Be sure to read the unpacking and initial checks section first, especially the
danger/warning subsections. After performing all initial checks including line voltage,
fuse selection, and detector termination, turn the PG-200 on using the power switch on
the rear panel. The PG-200 should go through a boot up procedure including a partial
self-test. Within about 10 seconds the display will show the READY indication, although
to realize the full performance specifications, a 15 minute warm-up period should be
observed.
The PG-200 produces high voltage gate output pulses which are delayed from an input
trigger. The input trigger can be from an external source, i.e. External Trigger mode, or
from the internal programmable frequency generator, i.e. Internal Trigger mode. The
active trigger mode is displayed by LED indication: EXT or INT above the Trigger
Select key. The Trigger Select key can be pressed to switch between modes. INHIBIT
positive and negative logic BNC inputs can be used to inhibit pulsing with the
corresponding polarity signal. Without INHIBIT connections, pulsing is always enabled.
Three output triggers are also provided. INTERNAL TRIGGER OUT is an output trigger
coincident with the input trigger time in internal trigger mode. DELAYED TRIGGER
OUT and AUX DLY’D TRIG OUT output triggers can be programmed for delays from
either the input trigger or the trailing edge of the high voltage gate pulse. The AUX
output is on the rear panel and has fewer features than the front panel output.
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