PCM-2 Manual.pdf - Voss Associates

Count Rate Units
Activity Units
Count Mode
10 & RWP
Entry Methods
Alarm Hold Time
System Address,
Baud Rate & Protocol
Anti-Coincidence
Radon Compensation
Status Logging
Count rates are displayed in either counts per second or counts per minute as
specified by this field.
The activity units are selected to be DPS, DPM, Bq or nCi.
The PCM-2 may be operated in Preset All, Minimum Count Time or Fixed Count
Time modes. This selection changes the format of several other display screens.
User Identity and Radiation Work Permit numbers, if used, are entered via the
keypad and/or an optional badge reader.
The number of seconds for which an alarm sounds if contamination is detected.
If the PCM-2 is connected to a host computer, these parameters determine the
address of this particular instrument and the communications baud rate and
protocol to be used. uLAN protocol may only be used with hardwire (RS-232,
RS-485) connections. Select non-uLAN for modem connections.
When anti-coincidence is enabled (default mode) particles are classified as beta or
alpha on the basis of signal amplitude. Disabling this feature causes the beta
counter channels to return a total particle count, including alphas. Users who
wish only to measure total radiation may do so by disabling anti-coincidence and
turning off all alpha count channels through the override parameter screen.
This software algorithm attempts to recognize and compensate for alarm patterns
typically caused by attached radon daughters. Radon compensation is always
disabled when combination alpha/beta emitting isotopes are expected.
Enables/disables the storage of instrument status changes on disk. If enabled, the
latest 200 status changes are stored. Status changes include HIGH
BACKGROUND, OUT OF GAS, COMM FAILURE, HV FAILURE,
CHANNEL SENSITIVITY FAILURE, HIILO COUNT FAILURE, and
NORMAL.
Voice Delay
Store Transactions?
If the voice annunciator option is installed, the PCM-2 will delay for this number
of seconds before prompting the user audibly.
A "YES" in this field causes the PCM-2 to save measurement results for
transmission to a site host computer. An" ALARMS" in this field causes the
PCM-2 to save only alarmed measurement results for transmission to a site host
computer. Note: If this value is set to "YES" or "ALARMS" when the
instrument is not connected to a host computer, the transaction buffer will
eventually overflow, causing the unit to remove itself from service. To reset the
PCM2.MANI REV AI April 1995 5-15