Fluke Biomedical 956A-201-M2 - Manual (Page 8)

1-4
1.3 SPECIFICATIONS, G-M DETECTOR CHECK SOURCE,
MODEL 897A SERIES
Radionuclide 36 CI
Source Activity: 8 microcuries
Scale Reading (Approximate)
897A-210,
897A-211
897A-220, 897A-221
897A-230, 897A-231
10-150 mR/h, Typical
10-50 mR/h, Typical
10-50 mR/h, Typical
Voltage 12 – 15 Vdc
Encapsulation Brass, high temperature soldered
1.4 SPECIFICATION, DETECTOR PREAMPLIFIER
(INTERGRAL)
Input Impedance >100 k-ohms
Output Impedance 50 ohms
Output Pulse Polarity Positive
Output Signal (50 ohm terminated) + 5 Vdc square-wave
Low Voltage* + 15 Vdc (Optional + 10 Vdc is Jumper Selectable)
Power Requirements + 15 Vdc @ 120 mA
Maximum Cable Length 2000 feet
Electronic Exposure Life Approximately 10 5 rads
Discriminator Level Adjustable from 0 to 1.5 Vdc (nominal value =1.00
Vdc)
Anti-Jam Level Adjustable from 0 to + 3 Vdc
Anti-Jam Oscillator Frequency Approximately 50 kHz
Pre-divide* Jumper Selectable
Analog & Digital Monitor Configuration Divide by 2, Square wave output
Optional Monitor Configuration Raw pulse output
* Preamplifier low voltage and pre-divide are selected with jumpers. Refer to the preamplifier circuit
description for more information. Standard Configuration is +15 Vdc Divide by 2.