Equipment information:

Fluke 78 Digital multimeter
Model: 78
Date: 1998
Category: Measurement instruments
Group: Digital multimeter
Description: Automotive Multimeter
                                    Maximum Voltage Between
any Terminal and Earth
Ground 300 V
Fuse Protection 15 A 600 V FAST Fuse
Display Digital: 4000 counts, updates 4/s
Bar Graph: 64 segments, update rate 40/s
Frequency: 9,999 counts, updates 3/s
Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature 40°C to 60°C (40°F to 140°F)
Temperature Coefficient 0.1 x (specified accuracy) per °C
(<18°C or >28°C). Temperature, 0.04% + 0.1°C per °C
Relative Humidity 0% to 95%, to 30°C (86°F)
0% to 75%, to 40°C (104°F)
0% to 45%, to 55°C (131°F)
Electromagnetic Compatibility
2000 meters maximum
In an RF field of 1 V/m on all ranges and functions:
Total Accuracy = Specified Accuracy +0.7% or range
Performance above 1 V/m is not specified.
Battery Type 9 V, NEDA 1604 or 6F22 or 006P
Battery Life Alkaline: 500 hrs (typical)
Carbonzinc: 300 hrs (typical)
Continuity Beeper 4096 Hz
Shock, Vibration Per MILT28800E for a Type III, Class 3
Style D, Instrument
Size (HxWxL) 1.12 in x 2.95 in x 6.55 in
(2.8 cm x 7.5 cm x 16.6 cm)
Weight 12 oz (340g)
Safety Complies with EN 610101:1993, ANSI/ISA S82.011994 and
CAN/CSA C22.2 No. 1010.192 Overvoltage Category II.
Safety Approvals CSA Certified, TUV Product Service licensed, UL
EMI Regulation Complies with FCC Part 15, Class B, VDE
0871B, Vfg. 2431991
Inductive Pickup Input: Magnetic field from spark plug
Output: Pulse to trigger Fluke 78
Thermocouple Type: K (Chromel vs. Alumel)
(Fluke 80PK1) Not suitable for immersion in liquid.
Accuracy: ±1.1°C
(2°F) between 0°C to 260°C (32°F-500°F).
Typically within 1.1°C (2°F) of NBS tables for temperatures
40°C (40°F) to 0°C (32°F).
Temperature Range: 40°C to 260°C.
(40°F to 500°F). Above 260°C (500°F), toxic gas might be
NOTE: The temperature range is primarily a function of the
limitations of the thermocouple's insulation.
Cable Insulation: Teflon
MIN MAX Recording Accuracy: Specified accuracy of
measurement function ±16 digits for
changes > 200 ms in duration (±52 digits in 400 J).
Nominal response time (5 to 100% of range) 100 ms to 80%

These manuals are available for the above equipment:

Fluke -- 78 -- Service Manual
File name: Fluke-6537-Manual-Page-1-Picture
Manual Type: Service Manual
Pages: 64
Size: 2.34 Mbytes (2458481 Bytes)
Language: english
Manual-ID/Number: PN 666617
Date: November 1998
Quality: Electronic document, no scan, very well readable.
Upload date:
MD5: d1f416102be2602125950960076ae66b
ed2kID: bae89bc0f03ebccac9c191f01ba85f0b
Downloads: 62 since 30 November 2014
For IEC 61010 CAT II Meters Only

This Service Manual provides information on maintaining,
troubleshooting, and
repairing the Fluke 78 Automotive Meter. This information
includes the following:
· Specifications
· Theory of operation
· Calibration
· Performance testing and troubleshooting procedures
· Replacement parts lists
· Schematic diagrams
A meter under warranty will be promptly repaired or replaced
(at Fluke’s option) and
returned at no charge. See the registration card for
warranty terms. If the warranty has
expired, the meter will be repaired and returned for a fixed
fee. Contact the nearest
Service Center for information and prices. A list of U.S.
and International Fluke
telephone numbers is included at the end of Chapter 4 of
this manual.
1-2. Organization of the Service Manual
This service manual has the following five chapters.
Chapter 1. Introduction and Specifications
Chapter 1 describes the Service Manual, explains special
terminology and conventions,
and provides complete meter specifications.
Chapter 2. Theory of Operation
Chapter 2 treats the meter’s circuitry as functional blocks,
with a description of each
block’s role in overall operation. A detailed circuit
description is then given for each
block. These descriptions explain operation to the component
level and support the
troubleshooting and repair procedures in Chapter 3.
Chapter 3. Maintenance
Chapter 3 provides maintenance information, detailed repair
procedures to the
component level, and performance tests. Troubleshooting and
repair procedures rely on
the Theory of Operation presented in Chapter 2 and the
Schematic Diagrams in Chapter
Chapter 4. List of Replaceable Parts
Chapter 4 provides parts lists and information on how and
where to order parts.
Chapter 5. Schematic Diagrams
Chapter 5 provides schematic diagrams for all assemblies and
a list of mnemonic
definitions to aid in identifying signal name abbreviations.
1-3. Conventions
The following conventions are used in this manual:
· Printed Circuit Assembly (PCA)
A "pca" is a printed circuit board and its attached parts.
· Circuit Nodes
A pin or connection on a component is specified by a dash
(-) and number following
the component reference designator.
For example, pin 19 of U30 would be U30-19.
· User Notation
Switch positions, input terminals, and display annunciators
are usually shown as
they appear on the meter.
Mnemonics used in the meter circuit descriptions correspond
to those on the
schematic diagrams in Chapter 5.
1-4. Specifications
Specifications for the Fluke 78 are in Table 1-1. Accuracy
is specified for a period of one
year after calibration, at 18°C to 28°C (64°F to 82°F) with
relative humidity to 95%. AC
conversions are ac-coupled, average responding, and
calibrated to the rms value of a sine
wave input.
Accuracy Specifications are given as:
±([% of reading] + number of least significant digits)
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