This manual presents service information for the Fluke 70, 73, 75, 77, 21, and 23 Series II Multimeters. The manual includes a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and schematic diagrams. This manual refer to both Series II Models 27 and 28 multimeters (hereafter referred to as “the Meter”). Model 28 II appears in all illustrations. The Model 27 II is an average-responding Digital Multimeter while the 28 II is a True-rms Digital Multimeter. In addition the 28 II measures temperature using a type-K thermocouple.
77/75/23/21 English Instruction Sheet
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1
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77/75/23/21
Series III Multimeter
Instruction Sheet
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Read First: Safety Information
•
Never use the meter if the meter or test leads look damaged.
•
Be sure the test leads and switch are in the correct position for
the desired measurement.
•
Never measure resistance in a circuit when power is applied.
•
Never touch the probes to a voltage source when the test
leads are plugged into the 10 A or 300 mA input jack.
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Never apply more than the rated voltage between any input
jack and earth ground.
Fluke 23 Series Ii Multimeter
•
Be careful when working with voltages above 60 V dc or 30 V
ac rms. Such voltages pose a shock hazard.
•
Keep your fingers behind the finger guards on the test probes
when making measurements.
Fluke 75 Multimeter User Manual
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Warning
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator (
M
)
appears.
Symbols
W
Read First: Safety Information
Y
Dangerous Voltage May Be Present
T
Double Insulation
Overvoltage Installation Category per IEC 1010:
CAT II
CAT III
Typical locations include; main wall outlets,
local appliances, and portable equipment.
Typical locations include switches in the fixed
installation and equipment for industrial use
permanently connected to the fixed installation.
PN 650512 August 1997 Rev.2, 7/98
1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies