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Table of Contents
Troubleshooting
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Summary of Contents for Fluke 481-DESI
- Page 1 Ion Chamber Survey Meter Operators Manual April 2011 © 2011 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
- Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
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Page 3: Table Of Contents
Table of Contents Title Page Introduction......................1 How to Contact Fluke ..................1 Features......................2 Overrange Rate....................2 Low Battery Indicator..................2 Audio Alarm....................2 Integrate Mode....................3 Freeze Mode ....................3 Auto-On Backlight ..................3 Specifications..................... 3 Receiving Inspection..................5 Operation ...................... - Page 4 Operators Manual MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
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Page 5: Introduction
& protects the Mylar window. How to Contact Fluke To contact Fluke, call one of the following telephone numbers: Technical Support USA: 1-800-44-FLUKE (1-800-443-5853) Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853) Canada: 1-800-36-FLUKE (1-800-363-5853) -
Page 6: Features
Operators Manual gpl01.bmp Figure 1. Fluke 481 Ion Chamber Survey Meter Features The following sections describe the features of the Survey Meter. Overrange Rate If the instantaneous radiation rate measured by the Model 481 exceeds 50 R/h (0.5 Sv/h), the 'R' in R/h or the 'Sv' in Sv/h displayed will blink to notify the user that the radiation field exceeds the measuring capability of the instrument. -
Page 7: Integrate Mode
Appropriate multipliers also appear on the display units: As indicated under Range, programmable in R/h or Sv/h External Controls ..........ON/OFF button, MODE button. Automatic Features ..........Ranging and zeroing are fully automatic. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:... - Page 8 Model 481B-DE-SI Typical Energy Dependence Dose equivalent units were determined using conversion coefficients at H*(10), found in ICRU 47, April, 1992. Side Slide - Closed Slide - Open Energy (keV) gpl02.eps MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
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Page 9: Receiving Inspection
2. Check that all items listed on the packing slip are present and in good condition. If damage is evident, make a claim with the carrier and contact Fluke immediately. If items are missing, contact Fluke. See the How to Contact Fluke section in this manual. -
Page 10: Mode Button
When the 481 survey meter is first turned on, it runs through a functional self-test procedure. During this self-test, the firmware version of the unit is displayed, along with the HI or LO chamber bias. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:... -
Page 11: Installation
Be sure that the 481 and terminal are properly connected via the RS-232 cable. If there is still a problem, contact Fluke for further instructions. See the How to Contact Fluke section in this manual. - Page 12 There are 20 bars between each major division. The numerical values of the five major divisions change appropriately for the range in which the instrument is operating. For instance, the first major division would have the numeric value of 1, 10, or 100. The MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
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Page 13: Maintenance
The display will indicate HI for good chamber voltage bias condition. The program in the 481 ROM is proprietary to Fluke. The firmware version appears in the digital part of the LCD display (prior to the “all elements on” display) when the instrument is turned on. -
Page 14: Storage
1. Remove the 9-volt batteries to be sure that the instrument will remain off during the disassembly process. 2. Remove the 4 screws from the case top. 3. Carefully remove the case bottom from the thick gasket that seals the top and bottom. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:... -
Page 15: Outer Mylar Window Replacement
6. Reinstall the cap and install the desiccant vial into the unit by slipping it into the clamp. 7. Secure the case top to the case bottom, with the gasket in between, using the four MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:... -
Page 16: Lithium Cell Replacement
6. Secure the battery board to the survey meter assembly with the 4 screws and lock washers removed in step 4. 7. Secure the case top to the case bottom, with the gasket in between, using the four screws removed in step 2. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:... -
Page 17: Replaceable Parts Information
8. Replace the 9-volt batteries, being sure to observe proper polarity. Replaceable Parts Information Fluke maintains a complete inventory of all normal replaceable parts. To place an order, or to obtain information concerning replaceable parts, contact Fluke. See the How to Contact Fluke section in this manual. -
Page 18: Troubleshooting
Remove desiccant and bake per the instructions in the Desiccant Regeneration section of this manual. After replacement, bake unit at 50 C for 8 hours. Erratic Readings Check for broken ion chamber window or loose collector. Check for loose chamber bias connector. MyFlukeStore 1.877.766.5412 www. .com Shop for Fluke products online at:...
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