CDV-715 MANUAL PDF

CD V, Model No. Zero Adjust 7 Step 2. Circuit Check 8 Step 3. Simplified Schematic Circuit Diagram 6 4.

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All the models 1, 1A, 1B of the were transistorized, and like other CDV ion chamber survey meters e. This allowed the CD V to span the range of both. According to an article in the November issue of Nucleonics: "Victoreen has developed a portable survey meter with an ion chamber detector having four decades of range What makes this Victoreen unit especially unique is the fact the detector is capable of responding to beta radiation just like the CD V!

The standard CD V see below had no such beta detection capability. For whatever reason, a Victoreen Model 1 never went into large scale production. The base has a square rather than rounded front end.

This indicates that it lacks the beta detection capability of the instrument pictured at the top of the page. Lionel Electronics was part of the same Lionel company that made toy trains. Note the black "R" just beneath the serial number on the Model 1A photo to right. This stands for "retrofit. Of primary concern were calibration shifts, excessive battery drain and an unreliable circuit battery check.

The calibration shifts seemed to be due to changes in the input resister and leakage currents in high humidity conditions. Among other things, the retrofits typically involved replacing the old hydrophilic high-meg resister with an all glass version. If there was a problem with the meter, it was replaced with a ruggedized version that can be identified by the black ring around it.

All retrofitted instruments have an "R" stamped on the case top at the location of the nomenclature. This document recommended that the instrument should be turned on for an "extended period, e.

The photo above left shows the front of the graphite removed so that the central anode a large circular metal disk supported by three posts can be seen. In the photo above right, the graphite has been removed except for the horizontal plate that forms the bottom.

The electrical connection to the central anode can be seen penetrating a small hole in the graphite towards the back side of the chamber. It seems that moisture can sometimes get into the chamber and affect the calibration.

In some cases, this problem can be corrected by drilling a small hole in the chamber wall, heating the instrument up, allowing it to return to room temperature in a dry environment, and soldering the hole. Size: 4. Battery life: hours of continuous use. Manufacturers: Victoreen Inst.

The Victoreen instrument was significantly different in terms of its circuitry. The major difference between the Victoreen 1A and 1B was that the latter used nonlinear potentiometers to reduce the coarseness of the calibration adjustment characteristic of the Model 1A.

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Manual for Radiation Survey Meter OCD Item No. CD V-715, Model No. 1A

All the models 1, 1A, 1B of the were transistorized, and like other CDV ion chamber survey meters e. This allowed the CD V to span the range of both. According to an article in the November issue of Nucleonics: "Victoreen has developed a portable survey meter with an ion chamber detector having four decades of range What makes this Victoreen unit especially unique is the fact the detector is capable of responding to beta radiation just like the CD V!

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CDV-715 MANUAL PDF

There are a lot of these around and should be re-calibrated for accurate readings. By far the most common US civil defense meter on the market today. This is a simple ion chamber radiological survey meter, specifically designed for high-radiation fields for which Geiger counters will give incorrect readings see above. Survey meters do not read alpha or beta radiation.

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