Nuclear Associates 06-912
Dosimeter Charger
February 2005
Manual No. 06-912-1 Rev. 2
©2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies
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 Battery Installation and Instrument Preparation ........................................... 1-1
Section 2: Operation.................................................................................................... 2-1
2.1 To Charge (Zero) the Dosimeter.................................................................. 2-1
2.2 Reading the Dosimeter ................................................................................ 2-1
Section 3 Maintenance ............................................................................................... 3-1
3.1 Maintenance ................................................................................................ 3-1
3.2 Storage ........................................................................................................ 3-1
3.3 Preventive Maintenance .............................................................................. 3-1
3.4 Troubleshooting ........................................................................................... 3-2
3.5 Special Problems......................................................................................... 3-2
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Introduction
General Description
1
Section 1
Introduction
1.1 General Description
This self-contained, battery-operated instrument will re-zero any self-reading dosimeter having a standard
charging end. The charger is contained in a two-part case held together
contact is located in the upper left-hand corner; the voltage control knob is in the upper right-hand corner. The
charging contact contains
attached, by a chain, to the
spring clips (that ensure constant contact) and has a dust
case.
1.2 Battery Installation and Instrument Preparation
Loosen the screw on the top of the charger and remove the bottom cover. Insert a standard 1.5V "D"
battery (not included), carefully noting the polarity markings.
by a captive screw. The charging
cover which is permanently
A spare bulb, not included, can be stored in the
case.
Replace the cover and tighten the screw. Remove the cap from the charging contact. The charger is now
ready for operation.
NOTE
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Operators Manual
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2.1 To Charge (Zero) the Dosimeter
Operation
To Charge (Zero) the Dosimeter
Section 2
Operation
2
IMPORTANT-IF THE DOSIMETER HAS A CAP
OVER THE CHARGING CONTACT END,
REMOVE IT!
1. Press the dosimeter charging contact lightly into the charger contact to illuminate the internal
scale.
2. Press firmly until the dosimeter "hairline" responds to adjustment of the zeroing knob by
moving smoothly up and down scale. Maintain pressure on the dosimeter. Adjust the position
of the hairline to zero. For low-range dosimeters (<10R), the hairline may have to be placed
to the left of zero to compensate for the "kick" to the right when contact is broken. Slowly
relax the pressure on the dosimeter, and remove it from the charger.
3. Adjustment may be checked by lightly pressuring the dosimeter into the charging contact to
illuminate the scale, or by simply looking through the eyepiece toward an external light
source. Re-zero as required.
2.2 Reading the Dosimeter
1. Point the charging-contact end of the dosimeter toward an external light source. Read the
scale through the eyepiece.
2. If no external light source is available, place the dosimeter on the charging contact, and press
lightly to illuminate the scale.
3. Read the dosimeter. If you have to re-zero the dosimeter, follow the procedure in Section 2.1.
NOTE
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Maintenance
Maintenance
Section 3
Maintenance
3.1 Maintenance
1. To Open Case: Loosen the screw on the top of the charger and remove the cover.
2. To Replace Bulb:
a. Open case and remove bulb.
b. Replace with new bulb (#131 or equivalent).
3. To Replace Battery: See Section 1.2.
4. Care of Charging Contact:
Always keep the protective cap on the charging contact when the charger is not in use. The clear
plastic surfaces of the charging contact should be kept dry, clean, and free of fingerprints. A soft
cloth, free of grit, dirt, lint, or moisture, may be used to clean the plastic surfaces.
Do not use solvent or cleaning fluid to clean plastic.
CAUTION
3
3.2 Storage
Remove the battery if the charger is to be stored for more than two months. Store with case closed and
protective cap
on charging contact.
3.3 Preventative Maintenance
1. Clean battery contacts with steel wool or equivalent.
2. Check battery and bulb (replace as required). Check electrical operation.
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3.4 Troubleshooting
If the instrument does not appear to operate properly, one of the following may be the reason:
Abnormal Condition Probable Cause Corrective Action
A. Light weak or fails to go on
when charging contact is
depressed.
B. Hairline image moves fluidly
across scale but will not go to
zero.
C. Hairline image moves
erratically across scale.
1. Weak battery.
2. Dirty (corroded) batter or
light switch spring contacts.
3. Loose bulb.
4. Bulb burned out.
1. Weak battery. 1. Replace battery.
1. Dirt on contacts.
2. Leaf Spring out of
adjustment.
3. Faulty dosimeter.
3.5 Special Problems
1. Replace battery.
2. Clean battery and light
switch contacts with steel wool
or equivalent.
3. Tighten bulb.
4. Replace bulb.
1. Blow contacts with clean, dry
air.
2. Repair or replace charger.
3. Repair or replace dosimeter.
Old chargers occasionally get out of calibration due to repair and maintenance by inexperienced personnel. One
symptom is that the charger will no longer zero a low-range dosimeter properly, and this affects any calibration,
electrical leakage, or other test of the dosimeter requiring reading of the fiber position. This can be tested by
charging a low-range dosimeter, lifting it from the contact, observing the fiber position and then shorting the
contact pin with an electrical conductor. If the fiber moves, the charger is faulty and should be returned for repair
or replacement.
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Fluke Biomedical
Radiation Management Services
6045 Cochran Road
Cleveland, Ohio 44139
440.498.2564
www.flukebiomedical.com/rms
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