Fluke 07-492 User Manual

Nuclear Associates 07-492

Mammographic Digital kVp Meter

Operators Manual

Fluke Biomedical

Radiation Management Services

6045 Cochran Road Cleveland, Ohio 44139

440.498.2564

120 Andrews Road Hicksville, New York 11801

516.870.0100

www.flukebiomedical.com/rms

Table of Contents

Section 1: General Information................................................................................... 1-1

1.1 Product Description ..................................................................................... 1-1

1.2 Specifications............................................................................................... 1-2

1.3 Receiving Inspection.................................................................................... 1-3

1.4 Storage ........................................................................................................ 1-3

1.5 Routing Cleaning ......................................................................................... 1-3

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

1.7 Inspection and Material Return Instructions................................................. 1-4

Section 2: Indicators and Controls............................................................................. 2-1

2.1 Front Panels ................................................................................................ 2-1

2.2 Numeric Readout......................................................................................... 2-1

2.3 Switches ...................................................................................................... 2-2

2.4 Top Panel .................................................................................................... 2-2

2.5 Rear Panel................................................................................................... 2-2

Section 3: Battery Installation and Setup .................................................................. 3-1

3.1 Installing/Replacing the Battery ................................................................... 3-1

3.2 Setting the Phase Switch (Rear Panel)........................................................ 3-1

3.3 Detector Positioning..................................................................................... 3-1

3.4 Determining mAs Requirements .................................................................. 3-2

3.5 Initial and Periodic Operation Checks.......................................................... 3-3

3.6 Voltage Divider Method................................................................................ 3-3

3.7 Multiple X-Ray Machine Method .................................................................. 3-4

Section 4: Theory of Operation................................................................................... 4-1

4.1 General ........................................................................................................ 4-1

4.2 Filtration Effects ........................................................................................... 4-1

4.3 Waveform Effects ........................................................................................ 4-1

4.4 Low Battery.................................................................................................. 4-1

4.5 Positioning Error .......................................................................................... 4-1

Section 5: Calibration and Adjustment ...................................................................... 5-1

5.1 Lo Battery Threshold Adjustment................................................................. 5-1

5.2 kVp Calibration Adjustments........................................................................ 5-1

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General Information

Product Description

Section 1

General Information

Care must be taken to ensure radiation beam is off prior to placing the unit into position.

To avoid erroneous results, the unit must be positioned in the center of the beam. Failure to position the unit in the center of the beam would cause unexpected results do to the difference in the beam spectrum at various locations of the beam.

This device is intended for use only by persons who have been trained in the proper interpretation of its readings and in the appropriate safety procedures to be followed in the presence of radiation.

Use of instrument while "LO BAT" indicator is displayed may result in erroneous measurements due to the loss of an accurate voltage reference.

WARNING

CAUTION

1.1 Product Description

The Model 07-492 Mammography kVp Meter is designed to measure the effective peak potential applied to mammographic x-ray tubes. The measurement is made without direct connection to the x-ray unit being tested.

The kVp Meter is a battery powered, self-contained instrument designed for portable use. Two modes of operation are available:

• Mo/Mo (Phase 1) - For use with single-phase x-ray machines using moly target (anode) and moly

filtration.

• Mo/Mo (Phase 3) - For use with three phase x-ray machines using moly target (anode) and moly

filtration.

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Nuclear Associates 07-492

Operators Manual

NOTE

Correction factors for different target/filter combinations are provided in Section 5, Calibration and Adjustment.

The kVp meter uses two differentially filtered detectors whose ratio of integrated outputs is calibrated over the range of 24 to 40 kVp. Measurement results are presented on an easy to read 3½ digit Liquid Crystal Display. Status is indicated by decimal point positioning on the readout. Low battery condition is indicated by LO BAT displayed on the readout.

1.2 Specifications

Range Mo: 24 kVp to 40 kVp

Accuracy ± 1.5 kV

Reproducibility ± 0.5 kV

Resolution 0.1 kV

Distance Dependence Negligible for SSD of 20 cm or greater

Angle Dependence Negligible for 10 degrees or less

Position Dependence Negligible for misalignment of 5 cm or less at 30 cm.

Calibration Period One year

Filtration Effects 1.5 kV per mmAl at 25 kVp

4.0 kV per mmAl at 35 kVp

Minimum Requirements 75 mA @ 24 kVp, 25 cm

Power Requirements 9V Alkaline Battery, MN1604A or equivalent

Display 3 ½ Digit LCD

Low Battery Indication: LO BAT High kV Indication: Left Blinking Decimal Low kV Indication: Middle blinking Decimal High Intensity Indication: Right blinking decimal and non-zero display. Low mAs Indication: Right blinking decimal and zero display.

LED Indicator Auto Reset, new exposure detected, and last reading cleared.

Controls Front Panel: Power switch. Rear Panel: Phase selection switch

Output Connector BNC Connector on rear panel for waveform output.

Dimensions (H x W x D) 2.5 in. x 8 in. x 6 in. (6.4 cm x 20.3 cm x 15.2 cm)

Weight 2.1 lbs. (.95 kg)

Temperature Limits Operating: +18° to + 40° C (+64° to + 104° F)

Maximum 90% relative humidity, non-condensing Storage: -18° to + 55° C (0° to + 132° F)

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