Fluke 28IIEX User manual
November 2011
© 2011 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
28 II Ex
True-rms Digital Multimeter
Users Manual
LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This
warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, 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, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that 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
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
i
Table of Contents
Title Page
Introduction .................................................................................................................... 1
How to Contact Fluke..................................................................................................... 1
Safety Information .......................................................................................................... 2
EX Safety Information .................................................................................................... 2
Errors and Load Restrictions ..................................................................................... 6
Ex-Certification Data.................................................................................................. 7
Features......................................................................................................................... 9
Automatic Power-Off ................................................................................................. 15
Input Alert™ Feature ................................................................................................. 15
Power-Up Options ..................................................................................................... 16
How to Make Measurements.......................................................................................... 17
AC and DC Voltage Measurements........................................................................... 17
Zero Input Behavior of True-rms Meters.................................................................... 18
Low-Pass Filter.......................................................................................................... 18
Temperature Measurements ..................................................................................... 19
28 II Ex
Users Manual
ii
Continuity Tests ........................................................................................................ 20
Resistance Measurements ....................................................................................... 22
How to Use Conductance for High Resistance or Leakage Tests ............................ 24
Capacitance Measurements ..................................................................................... 25
Diode Tests............................................................................................................... 26
AC or DC Current Measurements............................................................................. 28
Frequency Measurements ........................................................................................ 31
Duty Cycle Measurements........................................................................................ 33
How to Determine Pulse Width ................................................................................. 34
HiRes Mode................................................................................................................... 34
MIN MAX Recording Mode ............................................................................................ 35
Smooth Feature (Power Up Option Only) ...................................................................... 35
AutoHOLD Mode ........................................................................................................... 37
Relative Mode................................................................................................................ 37
Maintenance .................................................................................................................. 38
General Maintenance................................................................................................ 38
Fuse Test.................................................................................................................. 38
How to Replace the Batteries.................................................................................... 39
How to Replace the Fuses........................................................................................ 42
Service and Parts .......................................................................................................... 42
General Specifications................................................................................................... 46
Detailed Specifications .................................................................................................. 48
AC Voltage................................................................................................................ 48
DC Voltage, Conductance, and Resistance.............................................................. 49
Temperature ............................................................................................................. 50
AC Current................................................................................................................ 50
DC Current................................................................................................................ 51
Capacitance.............................................................................................................. 51
Diode ........................................................................................................................ 52
Contents (continued)
iii
Frequency ................................................................................................................. 52
Frequency Counter Sensitivity and Trigger Levels .................................................... 52
Duty Cycle (Vdc and mVdc) ...................................................................................... 53
Input Characteristics.................................................................................................. 53
MIN MAX Recording.................................................................................................. 54
28 II Ex
Users Manual
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v
List of Tables
Table Title Page
1. Symbols................................................................................................................................. 8
2. Inputs .................................................................................................................................... 9
3. Rotary Switch Positions......................................................................................................... 10
4. Pushbuttons .......................................................................................................................... 11
5. Display Features ................................................................................................................... 13
6. Power-Up Options ................................................................................................................. 16
7. Functions and Trigger Levels for Frequency Measurements................................................. 32
8. MIN MAX Functions .............................................................................................................. 36
9. Approved Batteries................................................................................................................ 40
10. Replacement Parts................................................................................................................ 43
11. Accessories........................................................................................................................... 45
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Users Manual
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vii
List of Figures
Figure Title Page
1. Display Features ................................................................................................................... 13
2. AC and DC Voltage Measurements ...................................................................................... 17
3. Low-Pass Filter...................................................................................................................... 19
4. Continuity Tests..................................................................................................................... 21
5. Resistance Measurements.................................................................................................... 23
6. Capacitance Measurements.................................................................................................. 25
7. Diode Tests ........................................................................................................................... 27
8. Current Measurements.......................................................................................................... 29
9. Components of Duty Cycle Measurements ........................................................................... 33
10. Current Fuse Test ................................................................................................................. 39
11. Battery and Fuse Replacement ............................................................................................. 41
12. Replacement Parts................................................................................................................ 44
28 II Ex
Users Manual
viii
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