Fluke 960SF-220 User Manual

Victoreen®

960SF-220, 960SF-221

960SF-230, & 960SF-231

March 2005
Manual No. 960SF-200-1 Rev. 2
©2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies

Scaler Module

Users Manual

Fluke Biomedical

Radiation Management Services

6045 Cochran Road
Cleveland, Ohio 44139

440.498.2564

www.flukebiomedical.com/rms

Table of Contents

Section 1: Introduction................................................................................................ 1-1

1.1 General Description ..................................................................................... 1-1

1.2 Application ................................................................................................... 1-1

1.3 Components ................................................................................................ 1-1

1.4 Specifications............................................................................................... 1-2

1.5 Receiving Inspection and Storage ............................................................... 1-3

1.6 Installation.................................................................................................... 1-3

1.7 Procedures, Warnings, and Cautions .......................................................... 1-3

Section 2: Theory of Operation................................................................................... 2-1

2.1 Theory of Operation..................................................................................... 2-1

2.2 Detector Input Circuitry ................................................................................ 2-1

2.3 Discriminator................................................................................................ 2-1

2.4 Counters ...................................................................................................... 2-1

2.5 Address Decoding Circuits........................................................................... 2-2

2.6 Bus Transceivers ......................................................................................... 2-2

2.7 Lamp Drivers ............................................................................................... 2-2

2.8 Relay Drivers ............................................................................................... 2-2

2.9 CHECK SOURCE and ACK/FAIL Switches................................................. 2-4

2.10 Analog Inputs............................................................................................... 2-4

2.11 Analog Output.............................................................................................. 2-4

2.12 High Voltage Power Supply ......................................................................... 2-4

2.13 High Voltage Shut Down.............................................................................. 2-5

2.14 Anti-Jam Printed Circuit Board..................................................................... 2-5

Section 3: Maintenance, Calibration and Troubleshooting...................................... 3-1

3.1 Maintenance ................................................................................................ 3-1

3.2 Calibration.................................................................................................... 3-1

3.3 Troubleshooting ........................................................................................... 3-1

Appendix A: Connector Designations ...........................................................................A-1

A.1 Connector Designations............................................................................... A-1

Appendix B: Applicable Drawings and Bill of Materials ............................................... B-1

B.1 Applicable Drawings ....................................................................................B-1

B.2 Bill of Materials ............................................................................................B-1

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(Blank Page)

Introduction

General Information

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

1-1

Victoreen 960SF-220,221,230,231

Operators Manual

• Test Input

1.4 Specifications

General specifications for the scaler are listed below. The Scaler Module is rated for nuclear safety­related applications and any repairs made to the nuclear rated module will void the safety-related rating.
The module (Series 960SF-200) must be returned to the factory for authorized, qualified (ANSI 45.2.6,
1978,Skill Level II) service.

Dimensions (W x H) 7.5 x 11.5 in (29.2 x 19.1 cm)

Weight 1 lb 7 oz (0.64 kg)

Operating Temperature 32°F to 122°F (0°C to 50°C)

Relative Humidity 0 to 95% non-condensing

Power +5 V @ 600 mA, +15 V @ 350 mA, -15 V @ 100 mA

Address Lines A0, A1, & A2

Control and Timing R/W, SHORT 02, & DS

Data Bus 8-bit bi-directional D0 through D7

Analog Inputs Four analog inputs 0 to +10 V

Analog Outputs Standard 4 to 20 mA (500 Ω maximum load)

Relay Drivers Six 24 VDC relay drivers used to drive 961RE-200-10 or 961RE-210-10

Relay Modules

Lamp Drivers Four lamp drivers for ALARM, WARN FAIL, CHECK SOURCE (C/S)

Switch Inputs Two switch inputs for CHECK SOURCE (C/S) and ACKNOWLEDGE

(ACK)

High Voltage Power Supply Adjustable 400 to 1800 VDC @ 1 mA maximum for detector HV Model

960SF-231, adjustable -400 VDC to -1800 VDC @ 1 mA

Discriminator Two selectable thresholds (upper and lower discriminator)

Test/Normal Switch Switch selectable between test signal and detector input

Pulse Out (J7) Buffered signal output to be used by the analyzer

Anti-jam On board circuit to detect jam condition causing a bit to be set at a

register

HV Shutdown High voltage shutdown circuit enables automatic shutdown of high

voltage by the controller. LED in front panel also lights up

HV Test Point Accuracy Front panel test point available to measure HV value at ratio of 300:1 +/­2%

Table 1-1. Model Descriptions

Model No. High Voltage Analog Inputs (4) Analog Output (1)

960SF-220 Positive Yes Yes Yes

960SF-221 Positive No Yes Yes

1-2

24 V Solid State Relay Outputs
(6)

Introduction

Specifications

960SF-230 Negative Yes Yes Yes

960SF-231 Negative No Yes Yes

1.5 Receiving Inspection and Storage

Receiving Inspection

Upon receipt of the unit:

1. Inspect the carton(s) and contents for damage. If damage is evident, file a claim with the carrier and
notify Fluke Biomedical, Radiation Management Services at 440.248.9300.

2. Remove the contents from the packing material.

3. Verify that all items listed on the packing list have been received and are in good condition.

1

NOTE

If any of the listed Items are missing or damaged,
notify Fluke Biomedical.

Storage

Storage of Victoreen instruments must comply with Level B storage requirements as outlined in ANSI
N45.2.2 (1972) Section 6.1.2 (.2). The storage area shall comply with ANSI N45.2.2 (1972) Section 6.2
Storage Area, Paragraphs 6.2.1 through 6.2.5. Housekeeping shall conform to ANSI N45.2.3 (1972).

Level B components shall be stored within a fire resistant, tear resistant, weather tight enclosure, in a
well-ventilated building or equivalent.

Storage of Victoreen instruments must comply with the following:

1. Inspection and examination of items in storage must be in accordance with ANSI N45.2.2 (1972)
Section 6.4.1.

2. Requirements for proper storage must be documented and written procedures or instructions must
be established.

3. In the event of fire, post-fire evaluation must be in accordance with ANSI N45.2.2 (1972), Section

6.4.3.

4. Removal of items from storage must be in accordance with ANSI N45.2.2 (1972), Sections 6.5 and

6.6.

1.6 Installation

The 960SF Scaler Module is supplied as part of a Radiation Monitoring System (RMS) or as a
replacement part for an existing RMS. When the module is shipped as part of a system, it is installed as
part of the RMS at the factory.

When a module is shipped as a replacement part, verify that jumper addresses and PROMs are in the
same configuration as the module that is being replaced.

1.7 Procedures, Warnings, and Cautions

The equipment described in this manual is intended to be used for the detection and measurement of
ionizing radiation. It should be used only by persons who have been trained in the proper interpretation of
its readings and the appropriate safety procedures to be followed in the presence of radiation.

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