Fluke Biomedical 960SF-220 - Manual (Page 5)

Introduction
General Information
1
1-1
Section 1
Introduction
1.1 General Description
The 960SF Scaler Module accumulates pulses from a remote radiation detector. The pulses are available
upon request from the associated controller. The discriminator permits adjustment of the scaler output to
eliminate the effects of extraneous input pulses or to select an input signal representing a single isotope.
The high voltage supply for energizing the remote detector is controlled by signals from the controller. The
controller can also select a digital signal representative of anyone of up to four separate analog input
signals.
An analog output signal representing the radiation level is provided. The scaler also provides up to six
digital output signals in response to the appropriate commands from the controller module. Figure 2-1 is a
block diagram of the scaler.
The module also provides an upper and lower discriminator adjustment for the input pulses. There are
four indicator lamps. They are controlled by the associated controller and are labeled ALARM, WARN,
ACK/FAIL, and CHECK SOURCE. The last two ACK/FAIL and CHECK SOURCE are lamp/pushbuttons
that communicate back to the controller.
A HIGH VOLTAGE adjustment provides the operator control over the remote detector high voltage
supply. A TEST INPUT jack and a TEST/NORM switch allows selection of a simulated detector input
signal for module testing.
1.2 Application
The scaler module is used in VICTOREEN 960 series digital radiation monitoring systems. The scaler is
compatible with both the 960MB and the 961MB motherboard bus structure.
1.3 Components
The scaler module contains the following basic components:
• Counter (18 bits)
• Relay drivers (6)
• Lamp drivers (6)
• Analog input (4)
• Switch inputs (C/S, ACK)
• Analog output (4-20 mA)
Options: 0-10 mV, 0-50 mV,
0-1 V, 0-5 V, and 0-10 V
• Signal select switch (TEST/NORM)
• Anti-jam board (960AJ)
• Automatic HV shutdown circuit
• Adjustable High Voltage