Digital Doorway Monitor
Operator Controls and Setup
13
9-Pin Data Connector
The 9-pin connector provides output signals from the instrument and input
voltage to the instrument. The pin assignments are:
pin1-
+BATTERY
pin2-
GND
IN
pin3-
FAIL_L
pin4-
RS232
DUMP
pin5-
ANALOG
OUT
pin6-
NA
pin7-
HIGH
ALARM_L
pin8-
EXT
RESET_L
pin9-
+5VDC
OUT
The FAIL and HIGH ALARM digital signal outputs are open drain 2N7002
outputs, able to sink about 50 mA each.
Detector Setups
Typical response and set points for the Product with NaI(TI) Scintillation
Detectors are as follows:
•
Operating Voltage: 600 V dc to 1200 V dc determined by comparing plateaus
•
Threshold: 10 mV dc (using a 39-inch cable)
•
Calibration Constant: 2400 cpm/
μ
R/hr
•
Dead Time Correction: 5 µsec
•
Linear Range with DTC: 10 µR/hr to 1500 µR/hr
Typical Checkpoints:
100
µR/hr
150 µR/hr
- calibration constant set point
200
µR/hr
500
µR/hr
1000 µR/hr
- dead time correction set point
1500
µR/hr
