17
Chapter 1
Operation
Gating the Detector with the PG-200
This section will describe how to set up the PG-200 with a Princeton Instruments
intensified detector for basic operation. In this example, the PG-200 will be the source of
timing for the system. In other examples below, external timing will be used. For this
setup, you will need a standard dual trace oscilloscope (50 MHz or faster) and some
coaxial cables. Even if this example does not correspond to your system configuration
exactly, you may want to go through it once to become familiar with the features of the
pulser.
The steps are as follows:
➧
Read the Dangers and Warnings section of this manual (beginning on page 7).
➧
Make sure that the PG-200 is off and the detector is not exposed to any light. Set up
the proper cooling for the detector.
➧
Connect the “Pulse output” of the PG-200 (on the back panel) to the “Gate” input of
the detector using the 3 ft. coaxial cable provided with the PG-200. Make sure this
detector is 1 M
terminated (it was originally purchased for use with a PG-200).
➧
Connect the pulse monitor output of the PG-200 (back panel) to channel A of a dual
trace oscilloscope using a coaxial cable without termination. Set the oscilloscope
amplifier to 1 volt/division (the pulse monitor signal is about 2 volts).
➧
Connect the Internal Trigger Output of the PG-200 (front panel) to the external
trigger input of the oscilloscope. Set the oscilloscope time scale to 5 microseconds
per division. Set the oscilloscope to trigger on the falling edge (the Trigger Output is
normally a 0 to 5 V negative-logic signal).
➧
Connect the Delayed Trigger Output of the PG-200 to the other equipment in your
experiment which needs to be triggered by the PG-200 (such as a laser) using a
coaxial cable without termination.
➧
Also connect the Delayed Trigger Output to the B channel of the oscilloscope and set
the channel B amplifier to 5 volts/division (this is also normally a negative-logic
TTL signal).
➧
Turn on the PG-200. After boot-up, the screen on the front of the instrument should
say READY.
➧
Your PG-200 has an internal battery-backed memory which remembers the settings
you have programmed from one usage to the next. To insure the factory default
settings, run the function key program #9. This is done by pushing the “F”
(Function) key followed by the “9” key, followed by the “E” (Enter) key. The PG-
200 will set itself to the values shown in the table below. After restoring the factory
default settings, the screen will once again display READY.
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