Fluke 51 User manual

®
51 & 52 Series II
Thermometer
Users Manual
English
September 1999 Rev.1, 6/01
© 1999-2001 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

Limited Warranty & Limitation of Liability
This Fluke product will be free from defects in material and workmanship for 3 years from the date of purchase. This war-
ranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse or abnormal conditions of opera-
tion 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
To register your product, visit www.fluke-warranty.com
10/96

i
Table of Contents
Title Page
Introduction....................................................................................................................1
Contacting Fluke....................................................................................................... 1
Getting Started............................................................................................................... 4
Components.............................................................................................................. 5
Display Elements...................................................................................................... 6
Buttons...................................................................................................................... 7
Using the Thermometer................................................................................................. 9
Changing Setup Options................................................................................................ 9
Entering or Exiting Setup.......................................................................................... 9
Setup Options........................................................................................................... 9
Changing a Setup Option.......................................................................................... 10
Measuring Temperatures............................................................................................... 11
Connecting a Thermocouple..................................................................................... 11
Displaying Temperatures.......................................................................................... 11
Holding the Displayed Readings............................................................................... 12
Viewing the MIN, MAX, and AVG Readings.............................................................. 12
Using the Offset to Adjust for Probe Errors.................................................................... 12

51 & 52 Series II
Users Manual
ii
Maintenance................................................................................................................... 13
Replacing the Batteries ............................................................................................. 13
Cleaning the Case and Holster.................................................................................. 13
Calibration ................................................................................................................. 13
Specifications................................................................................................................. 13
Environmental............................................................................................................ 13
General...................................................................................................................... 14
80 PK-1 Thermocouple (supplied with thermometer) ................................................ 14
Electrical.................................................................................................................... 14
Replacement Parts and Accessories.............................................................................. 15

1
51 & 52 Series II
Introduction
The Fluke Model 51 and Model 52 Thermometers (“the
thermometer”) are microprocessor-based, digital
thermometers designed to use external J-, K-, T-, and E-
type thermocouples (temperature probes) as temperature
sensors.
Use the thermometer only as specified in this manual.
Otherwise, the protection provided by the meter may be
impaired.
Refer to safety information in Table 1 and meter symbols
in Table 2.
Contacting Fluke
To order accessories, receive assistance, or locate the
nearest Fluke distributor or Service Center, call:
1-888-99-FLUKE (1-888-993-5853) in USA
1-800-36-FLUKE (1-800-363-5853) in Canada
[phone] in Europe
[phone] in Japan
[phone] in Singapore
[phone] from other countries
Address correspondence to:
Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett, WA 98206-9090 5602 BD Eindhoven
USA The Netherlands
Visit us on the World Wide Web at: www.fluke.com
To register your product, visit www.fluke-warranty.com

51 & 52 Series II
Users Manual
2
Table 1. Safety Information
WWarning
A Warning identifies conditions and actions that pose hazards to the user. 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.
•Replace the batteries as soon as the battery indicator (B) appears. The possibility of 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.

51 & 52 Series II
Introduction
3
Table 1. Safety Information (cont.)
WWarning (cont.)
• Model 52: Measurement errors may occur if voltages on the measurement surfaces result in potentials
greater than 1 V between the two thermocouples. When potential differences are anticipated between the
thermocouples, use electrically insulated thermocouples.
•When servicing the thermometer, use only specified replacement parts.
•Do not use the thermometer with any part of the case or cover removed.
Caution
A Caution identifies conditions and actions that may damage the meter or the equipment under test.
•Use the proper thermocouples, function, and range for your thermometer.
•Do not attempt to recharge the batteries.
•To prevent explosion, do not throw batteries into a fire.
•Follow local laws or regulations when disposing of batteries.
•Match the +and −polarities of the battery with the battery case.

51 & 52 Series II
Users Manual
4
Table 2. International Symbols
WRefer to the manual for information about this
feature. PComplies with European Union directives.
MBattery. Complies with relevant Canadian Standards
Association directives.
Getting Started
Everything in this Users Manual applies both to Models
51 and 52 unless otherwise indicated.
To become familiar with the thermometer, study the
following:
•Figure 1 and Table 3 describe the components.
•Figure 2 and Table 4 describe the display.
•Table 5 describes the functions of the buttons.
Then read the following sections.

51 & 52 Series II
Getting Started
5
Components
xx
3
4
512
6
7
aas01f.eps
Figure 1. Components
Table 3. Components
AThermocouple T1 input
B Model 52: Thermocouple T2 input
CHolster
DDisplay
EButtons
FBattery door
GBatteries

51 & 52 Series II
Users Manual
6
Display Elements
xx
2345
6
7
8
9
10
1
aas02f.eps
Figure 2. Display Elements
Table 4. Display Elements
AThe thermocouple measurement includes an
offset. See "Changing Setup Options."
BThe displayed readings do not change.
CA shift function is in progress.
DSetup is in progress.
ELow battery. Replace the batteries.
FPrimary Display.
Model 51 : T1 reading.
Model 52: T1, T2, or T1-T2 reading.
GThe temperature unit.
HSecondary Display: MAX, MIN, AVG, or offset.
Model 52: T1or T2 reading.
IThe thermocouple type.
JTime Display: The elapsed time.