Instruction and maintenance manual for the CD V-715 Model 1A radiological survey meter manufactured by The Victoreen Instrument Company in 1962. Covers precautions for high impedance circuitry and semi-conductor components, general description of sensing elements and electronic circuitry, theory of operation including ionization chamber and measuring circuit, installation procedures, operational adjustments including zero adjust and circuit check, battery replacement, cleaning, and troubleshooting. Includes schematic circuit diagram, circuit board assembly illustration, and parts lists for electrical and mechanical components.

Table of Contents:

Section 1. Precautions .... page 3
1.1 High Impedance Circuitry .... page 3
1.2 Semi-Conductor Components .... page 3
1.3 Electrometer Tube .... page 3
Section 2. General Description .... page 3
2.1 Introduction .... page 3
2.2 Sensing Element .... page 3
2.3 Electronic Circuitry .... page 4
2.4 Battery .... page 4
2.5 Meter and Controls .... page 4
2.6 Physical Features .... page 4
Section 3. Theory of Operation .... page 4
3.1 Ionization Chamber .... page 4
3.2 Input Circuit .... page 5
3.3 Measuring Circuit .... page 5
3.4 Power Supply Circuit .... page 5
Section 4. Installation .... page 7
4.1 Inspection .... page 7
4.2 Battery Installation .... page 7
4.3 Shoulder Strap Installation .... page 7
Section 5. Operation .... page 7
5.1 Adjustments and Readings .... page 7
Step 1. Zero Adjust .... page 7
Step 2. Circuit Check .... page 8
Step 3. Range Selection and Reading .... page 8
Section 6. Operator's Maintenance .... page 8
6.1 Battery Replacement .... page 8
6.2 Cleaning .... page 9
Section 7. Preventive Maintenance .... page 9
7.1 Preventive Maintenance .... page 9
Section 8. Corrective Maintenance .... page 9
8.1 Calibration .... page 9
8.2 Disassembly for Corrective Maintenance .... page 10
8.3 Trouble Shooting .... page 10
Section 9. Replaceable Parts Lists .... page 14
9.1 Electrical Components .... page 14
9.2 Mechanical Components .... page 15
9.3 List of Manufacturers .... page 16
Figure 1. View of CD V-715, Showing Operating Controls .... page 2
Figure 2. View of CD V-715, Showing Major Components .... page 2
Figure 3. Simplified Schematic Circuit Diagram .... page 6
Figure 4. Method of Attaching Shoulder Straps .... page 7
Figure 5. Circuit Board Assembly .... page 12
Figure 6. Schematic Circuit Diagram .... page 13

CD V-715 Model 1A Radiological Survey Meter Manual

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