Precision Platform 4022 Scanner
Cable End Electrical Assemblies and Precision Measurement Processor
Figure 6-13 Radiation Fault Protect PCB Assembly
6.6.4.2.
Setting the voltage threshold
The Radiation Fault/Protect board compares the analog output of the X-
ray detector to a threshold voltage. Select the threshold by opening pin
shunts on the board. See Table 6-12 for voltage thresholds and the
corresponding shunt configurations.
Whenever the signal exceeds the threshold set (indicating that the X-ray
beam is present), the two radiation lamp contact outputs are set active
(closed). This circuit has hysteresis to prevent chattering. The outputs are
used as redundant radiation indicator drivers.
Table 6-12 Threshold Voltage
W2 Shunts
Voltage
Threshold Set
All W2 shunts removed
178 mV ± 10 mV
Shunts for pins 2-7, 3-6, and 4-5
removed
156 mV ± 10 mV
Shunts for pins 3-6 and 4-5 removed
134 mV ± 10 mV
Shunt for pins 4-5 removed
112 mV ± 10 mV
No W2 shunts removed
90 mV ± 10 mV
10/18/07
p/n
6510020208
6-34
Summary of Contents for 4022
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