50D
Table of contents
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These service instructions are for use by qualified personnel only. To avoid
electric shock, do not perform any servicing unless you are qualified to do so.
Introduction
This document contains specifications, general maintenance information, performance tests, calibration
procedures, and a list of user replaceable parts for the Fluke 50S and 50D Thermometers, hereafter referred
to as “the thermometer”.
Service
To contact Fluke, order parts, or locate a Fluke service center, call one of the following telephone numbers:
50S & 50D
Thermometer
Calibration Information
WWarning
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-675-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or, visit Fluke's Web site at www.fluke.com.
Warranty
This Fluke product will be free from defects in material and workmanship for one year from the date of
purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse
or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty
on Fluke’s behalf. To obtain service during the warranty period, send your defective tester to the nearest
Fluke Authorized Service Center with a description of the problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER WARRANTIES, SUCH AS FITNESS FOR
A PARTICULAR PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS NOT LIABLE FOR ANY
SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING
FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the exclusion or limitation
of an implied warranty or of incidental or consequential damages, this limitation of liability may not apply to
you.
Fluke Corporation
P.O. Box 9090
Everett WA
98206-9090
Fluke Europe B.V.
P.O. Box 1186
5602 B.D.
Eindhoven
The Netherlands
PN 1281009
October 1999 Rev.1, 3/03
©1999-2003 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
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50S & 50D Thermometer
Calibration Information
International Symbols
Table 1 identifies the international electrical symbols used in this document.
Table 1. International Electrical Symbols Used in this Document
N
Low Battery
Complies with relevant Canadian
Standards Association directives
Underwriters Laboratories, Inc.
Precautions and Safety Information
Use the thermometer only in the way s speci fi ed in the 50S & 50D Users Manual, part number 1278540.
In this manual, a
Caution statement identifies conditions and actions that may damage the thermometer or the test
instruments.
To avoid electrical shock or personal injury, follow these guidelines:
Before using the thermometer, inspect the case. Do not use the thermometer if it appears
•
damaged. Look for cracks or missing plastic. Pay particular attention to the insulation
around the connectors.
Disconnect the thermocouple(s) from the thermometer before opening the case.
•
Warning statement identifies conditions and actions that pose a hazard to the user; a
Safety Information
WWarning
Important information
Complies with European Union directives
Replace the battery as soon as the low battery indicator (
•
false readings can lead to personal injury.
Do not use the thermometer if it operates abnormally. Protection may be impaired.
•
When in doubt, have the thermometer serviced.
Do not operate the thermometer around explosive gas, vapor, or dust.
•
Do not apply more than the rated voltage, as marked on the thermometer, between the
•
thermocouple(s), or between any thermocouple and earth ground.
When servicing the thermometer, use only specified replacement parts.
•
Do not use the thermometer with any part of the case or cover removed.
•
N) appears. The possibility of
Caution
To avoid damaging the thermometer or the equipment under test:
• Use the proper thermocouples, function, and range for your thermometer.
• Do not attempt to recharge the battery.
• To prevent explosion, do not dispose of battery in fire.
• Follow local laws or regulations when disposing of battery.
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Specifications
General
Weight 280 g (10 oz)
Specifications
Dimensions
(without holster)
2.8 cm × 7.5 cm × 16.6 cm
(1.1 in × 3 in × 6.6 in)
Battery Standard 9 V battery (NEDA 1604, 6F22, or 006P)
Protection Class III as defined in IEC 348, Safety Requirements for Electronic Apparatus
Environmental
Operating Temperature 0 oC to +50 oC (+32 oF to +122 oF)
Storage Temperature −40 oC to +60 oC (−40 oF to +140 oF)
o
C to 35 oC (+32 oF to +95 oF)
o
C to 50 oC (+32 oF to +122 oF)
Humidity
0 % to 90 %: 0
0 % to 70 %: 0
Electrical
o
C to +1370 oC (−328 oF to +2498 oF)
o
C to +760 oC (−328 oF to +1400 oF)
o
C or +1.0 oF
o
C or +0.2 oF
o
C) [±(0.1 % of reading + 1.3 oF)]
o
C) [±(0.1 % of reading + 1.4 oF)]
Measurement Range
Display Resolu tion
Measurement Accuracy
Temperature
Coefficient
K-type: −200
J-type: −200
Low: +1.0
High: +0.1
K-type: ±(0.1 % of reading + 0.7
J-type: ±(0.1 % of reading + 0.8
0.01 % of reading + 0.03 oC (0.03 oF) for [ambient temperatures from +18 oC to +28 oC
o
F to +82 oF) ]
(+64
Maximum Differe ntial Common Mode
1 V (Maximum voltage difference between T1 and T2)
Voltage
Temperature Scale IPTS-68
Certification P, $
Applicable Standards NBS 125, IEC 584
Accuracy is specified for ambient temperatures between +18 oC (+64 oF) and +28 oC (+82 oF) for a period of 1 year. The above
specifications do not include thermocouple error.
Accuracy is unspecified when the input lead length is resonant with the interfering frequency.
Basic Maintenance
Basic maintenance requir ed by the therm om ete r is discu ssed in this sect ion.
Cleaning the Thermometer
Caution
• To avoid damaging the thermometer, do not use aromatic hydrocarbons or
chlorinated solvents for cleaning. These solutions react with the plastics
used in the thermometer.
• Do not allow the LCD to get wet.
• Do not remove any of the lubricant from the input terminals.
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50S & 50D Thermometer
Calibration Information
Clean the thermometer case with a mild detergent and water.
The pca may be washed with isopropyl alcohol or deionozed water and a soft brush. Dry the pca with clean
dry air at low pressure, then bake it at 50
Disassembly/Reassembly
Thermometer disassembly is necessary to replace the battery and some interior parts (see “Replaceable
Parts”, later in this document). Refer to Figure 1 when disassembling and reassembling the thermometer.
To disassemble the thermometer:
1. Turn the thermometer OFF if necessary.
2. Loosen the four bottom case screws and remove the top case.
To reasemble the thermometer:
1. Replace the top case.
2. Tighten the four bottom case screws.
o
C for 24 hours.
Figure 1. Thermometer Disassembly and Reassembly (50D is shown)
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zf01f.eps
Changing the Battery
• Replace the battery as soon as the low battery indicator (N) appears. The
possibility of false readings increases when the battery is not fully charged.
False readings can lead to personal injury.
• To avoid electrical shock, disconnect the thermocouple(s) before opening
the case.
• Do not attempt to recharge the battery.
• To prevent explosion, do not dispose of the battery in fire.
• Follow local laws or regulations when disposing of batteries.
To replace the battery, refer to Figure 2 and the assembly procedures located previously in this document.
Basic Maintenance
WWarning
Caution
Figure 2. Replacing the Battery (50D is shown)
zf02f.eps
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