PCM-2 Manual.pdf - Voss Associates

The RDA confidence should be edited if it is to be other than the default
value of 95 %.
The count time (max count time in Mode 3) is set in this screen.
Edit Instrument Parameters
The preferred count rate units (cpm or cps), activity units (dpm, dps, Bq, or
nCi), and count mode are set in this screen. The three counting modes are:
MODE 1 - Preset All
MODE 2 - Fixed Count Time (Maximum Sensitivity)
MODE 3 - Minimum Count Time
If reporting or logging of data either locally or over a network installation is
desired, additional parameters will need to be configured in this screen.
Refer to section 5 for more information on configuration parameters.
Quick-Start Instructions
These instructions are intended to assist the first-time user in setting up Eberline
PCM-2 systems. Once this initial setup has been completed, adjustments may be
made to suit site-specific requirements and policies. Some familiarity with
instruments using gas proportional radiation detectors is assumed in these instructions.
Refer to the technical sections of this manual for detailed information regarding the
unit and its operation.
Power Connections
Counting Gas
Supply
The PCM-2 may be operated from either 90-132 or 180-264 Volts, 50/60 Hz.
Voltage range selection is made by a slide switch located on the computer power
supply inside the electronics enclosure. Power is brought in via a line cord
attached to the outlet strip located inside the unit. Remove either of the two cover
plates located on the top of the unit and at the lower rear corner and route this
cord out to a convenient power receptacle. Insure that the switch on the power
strip is on, then turn on the unit by actuating the power switch on the side of the
electronics enclosure. Normal operation is indicated by fan noise from the
computer power supply. Within a few seconds, the disk drive will also begin to
operate, lights on the detector boards will flash, and text will appear on the CRT.
Two gas inlet hoses exit from the lower right corner of the electronics enclosure.
Each of these should be connected to a supply of P-lO gas (10% methane, 90%
argon) at a regulated pressure of 5 psi. Insure that both gas supplies are regulated
to the same pressure so that flow rates will not change when the alternate source
PCM2.MI\N/ REV I\/I\pril 1995 2-G