Fluke 07-453 User Manual

MODEL 07-453

X-RAY PULSE COUNTER/EXPOSURE TIME METER

Instruction Manual

Fluke Biomedical

Radiation Management Services

6045 Cochran Road Cleveland, Ohio 44139

440.498.2564

www.flukebiomedical.com/rms

Contents

Section 1: Description ...................................................................................................................... 1-1

Section 2: General Instructions ...................................................................................................... 2-1

Section 3: Battery Replacement ..................................................................................................... 3-1

Section 3: Oscilloscope Output ...................................................................................................... 3-1

Section 4: Calibration ...................................................................................................................... 4-1

Section 4: Exposure Time Conversion Chart ................................................................................ 4-1

Section 5: Warranty .......................................................................................................................... 5-1

Section 6: Service Information ....................................................................................................... 6-1

Section 7: Specifications .................................................................................................................. 7-1

Section 8: Appendix ......................................................................................................................... 8-1

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Section 1

Description

1.1 Product Description

The Fluke Biomedical Model 07-453 X-ray Timer/Counter is used to measure the duration of radiation output produced by X-ray generators. The Model 07-453 is a solid-state, digital instrument designed specifically for service personnel in assessing the performance of radiation generator timing controls. The instrument is a noninvasive instrument, which samples the radiation beam of x-rays.

The Model 07-453 can be used as follows:

1) To count the number of x-ray pulses produced by half-wave and full-wave rectified machines. It will count the output pulses typically 60 pulses per second for half-wave rectified machines or 120 pulses per second for full-wave. Dental x-ray machines are usually half-wave rectified.

2) To measure the length of radiation output when the x-ray output is steady state such that "pulsing" does not exist. X-rays that generate steady outputs include 3-phase AC medical x-ray machines; capacitor discharge x-ray machines and DC operated x-rays.

3) To measure the "on time" or relay contact closure time by counting the number of pulses of AC line voltage (90 to 130 VAC) via the front panel input jacks and test leads.

The Model 07-453 replaces not only mechanical impulse counters, but also other electronic counters. The small hand held size conveniently fits in a small toolbox, jacket pocket or handbag.

There is no "Reset" button. The Model 07-453 automatically resets at the beginning of each exposure, holding the reading until the next exposure.

The most convenient way of using the 07-453 is to place it directly under the x-ray head. Step back, take the exposure and then read the exposure time in pulses or milliseconds. An optional remote sensor is also available to allow use of the 07-453 at distances of up to 10 feet away from the x-ray.

It is important that the user be thoroughly familiar with the contents of this manual before performing any tests on radiation generating equipment. It is also imperative that the user be thoroughly qualified, and familiar with safety precautions and other practices relating to radiation generators.

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Section 2

General Instructions

2.1 General Instructions

Switch Settings The front panel selector toggle switch on the Model 07-453 has 3 positions, 'OFF', 'PULSES", and "MILLISECONDS'. The switch is OFF in the center position.

PULSES When the switch is moved to the 'PULSES' position, the instrument will be used for measuring output pulses from half-wave or full-wave rectified machines as well as AC line voltage pulses. Normally, each full second of exposure will produce 60 pulses. An exposure of 2/10 second will read 12 for example. Refer to the chart on page 5 for further illustration.

MILLISECONDS With the switch in the 'MILLISECONDS' position, the instrument will measure the length of time that a DC or 3-phase AC x-ray is on. The display reading will be in milliseconds i.e. an exposure of 1 second will read 1000, an exposure of 2/10 second will read 200.

OFF All power to the instrument is disconnected in the 'OFF' position. Set the switch to 'OFF' when not in use to conserve battery life. The center position is OFF.

Connections When reading directly from an x-ray head, no connections are made to the instrument. Point the x-ray head at the "target" area of the Model 07-453 (near the lower left side of the instrument). Take an exposure and read the time on the display in pulses or milliseconds.

Remote Sensor To use the optional remote sensor, connect the plug at the end of the remote sensor cable in to the jack on left side of the 07-453 case. Point the x-ray head at the target on the Remote Sensor. Stretch the cable out and use as described above.

AC Input Connect the two test leads to the two input jacks on the front of the instrument. Since the instrument counts AC pulses, the AC line must be switched by the relay that is in the timer under test. A typical wiring configuration is shown in schematic form in Figure 1. A typical wiring configuration for testing an Electronic Control Concepts Model 8200A Timer is shown in Figure 2.

The circuit for AC inputs is completely isolated from the rest of the instrument. No damage to the instrument will occur if the probes are reversed. However, to obtain the best accuracy, the '+' (Red) should be connected to the high side of the line, and the black or '-' probe should be connected to the low side of the line.

Oscilloscope Output

Relay

07-453

Figure 1

Red

Wiring for A C Measurment

Black

A jack is available at the left side of the instrument to observe x-ray waveforms. When looking at the Model 07-453 from the left, the connector labeled ‘SCOPE’ the Oscilloscope output. This connector takes a standard 2.5mm mono phone plug.

ADD JUMPER

Blk

Wht

Grn

BLK

AC LINE

TO 8700

Model 07-453 Connection to Model 8200A Timer

FIGURE 2

RED

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