Detector Boards
Gem-5 User’s Manual 339
The signal assignments for the 16-wire Detector Serial Interface connector (J7) are
shown in Table 31.
Table 31 Signal Designations for the Detector Serial
Interface Bus (16-wire ribbon cable)
PIN# SIGNAL NAME DESCRIPTION
1 GND GROUND
2 CA COMMAND DIFFERENTIAL LINE A
3 GND GROUND
4 CB COMMAND DIFFERENTIAL LINE B
5 GND GROUND
8 GND GROUND
9 DB DATA DIFFERENTIAL LINE B
10 GND GROUND
11 +12V +12V POWER
12 +12V +12V POWER
14 +12V +12V POWER
15 +12V +12V POWER
Detector Boards
A Detector Board is attached to each installed detector. These boards, which are
software controlled, contain a high voltage supply, preamplifier, pulse shaping
amplifier, discriminator, counters and interface circuitry.
CAUTION:
Remove power before (dis)connecting cables to or
from a Detector Board.
Gamma Detector Boards (i.e., for scintillation detectors) have a single channel
preamplifier/amplifier, pulse shaping amplifier, discriminator, and counter.
A test pulser is provided on-board for amplifier and discriminator testing. The pulse
amplitude is software-controlled and can range from 0 to 2.5 for the pulser and 0 to
0.5 V for the discriminator in gamma counting circuits.
The high-voltage power supply provides regulated positive voltage under software
control. The actual value of the high voltage is measured and used to detect high
voltage failures and for display purposes.
To Next Page
Loading...