PCM-2 Manual.pdf - Voss Associates

Section 17
o ti ns
Hand Probe Option (PCM2 OPT1)
Hand Probe
Clicker Board
This option for the PCM-2 includes an HP-100C, 100 cm z hand held frisking
detector with a detector holder mounted on the left side of the instrument. Also
included is a modified Modular Detector Board (SP28B) and an audible Clicker
Board which clicks proportional to the net count rate of the combined alpha and
beta particles being detected. The modified MDB is mounted inside the unit on
the left-hand side of the main frame while the clicker board resides in the ceiling
adjacent to the PC speaker mounting bracket.
PCM-2 units equipped with this option include a display of the hand probe's
background and alarm status whenever the probe is removed from its holder. If
the hand probe is removed from its cradle during background update or after the
results of a measurement are posted, the hand probe readings and the new alarm
setpoints are displayed on the screen for both alpha and beta channels. If the
alarm setpoints are non-zero, the hand probe readings are compared to the alarm
setpoints. If either alarm setpoint is exceeded, the instrument begins to beep and
will continue to do so until the hand probe is replaced in its cradle or until the
probe reading falls below the alarm setpoint. Setting the alarm setpoint to zero
disables the alarm checking for that particular channel. The hand probe display
automatically disappears when the probe is returned to is holder.
Reference the Section 13 for detailed information reguarding the modified
configuration of the standard Modular Detector Board used for the Hand Probe
Option.
General Description
The PCM-2 Clicker Board is used in conjunction with monitors which have the
Hand Probe Option installed. The purpose of this board is to output audible
"clicking" tones which are proportional to the combined net count rate
(background subtracted) of the alpha and beta hand probe channels. Clicking
Pl:M? MAN/ RF\I AI I\pril 1gq:, "17-1