Fluke 28 II Ex Use and care manual

May 2012
© 2012 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies. 1
28 II Ex
Digital Multimeter
Calibration Information
Introduction
XWWarning
To prevent possible electrical shock, fire, or personal injury:
•Read all safety information before you use the Product.
•Do not do the performance tests or calibration adjustment
procedures unless qualified to do so.
•Carefully read all instructions.
The 28 II Ex Calibration Information contains adjustment and performance test
procedures for the Fluke Model 28 II Ex Digital Multimeter (the Product or Meter).
This document includes:
•Safety Information (page 2)
•International Electrical Symbols (page 4)
•Specifications (page 5)
•General Maintenance (page 9)
•Fuse Test (page 9)
•Performance Tests (page 12)
•Calibration Adjustment Procedure (page 16)
•Limited Lifetime Warranty (page 20)
See the 28 II Ex Users Manual for instructions on Product operation.
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
•Technical Support USA: 1-800-99-FLUKE (1-800-993-5853)
•Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)
•Canada: 1-800-36-FLUKE (1-800-363-5853)
•Europe: [phone]
•Japan: [phone]
•Singapore: [phone]
•Anywhere in the world: [phone]
Or, visit Fluke's website at www.fluke.com.
To register your product, visit http://register.fluke.com.
To view, print, or download the latest manual supplement, visit
http://us.fluke.com/usen/support/manuals.

28 II Ex
Calibration Information
2
Safety Information
A Warning identifies conditions and procedures that are dangerous to the user. A
Caution identifies conditions and procedures that can cause damage to the Product or the
equipment under test.
XWWarning
To prevent possible electrical shock, fire, or personal injury:
•Use the Product only as specified, or the protection
supplied by the Product can be compromised.
•The battery door must be closed and locked before you
operate the Product.
•Replace the batteries when the low battery indicator ()
shows to prevent incorrect measurements.
•Remove all probes, test leads, and accessories before the
battery door is opened.
•Do not use test leads if they are damaged. Examine the test
leads for damaged insulation, exposed metal, or if the wear
indicator shows. Check test lead continuity.
•Do not apply more than the rated voltage, between the
terminals or between each terminal and earth ground.
•Limit operation to the specified measurement category,
voltage, or amperage ratings.
•Do not operate the Product with covers removed or the
case open. Hazardous voltage exposure is possible.
•Do not touch voltages > 30 V ac rms, 42 V ac peak, or 60 V
dc.
•Use the correct terminals, function, and range for
measurements.
•Do not work alone.
•Measure a known voltage first to make sure that the
Product operates correctly.
•Use only cables with correct voltage ratings.
•Use only current probes, test leads, and adapters supplied
with the Product.
•Do not exceed the Measurement Category (CAT) rating of
the lowest rated individual component of a Product, probe,
or accessory.
•Connect the common test lead before the live test lead and
remove the live test lead before the common test lead.

Digital Multimeter
Safety Information
3
•Examine the case before you use the Product. Look for
cracks or missing plastic. Carefully look at the insulation
around the terminals.
•Do not use and disable the Product if it is damaged.
•Do not use the Product if it operates incorrectly.
•Do not use the Product in damp or wet environments.
•Keep fingers behind the finger guards on the probes.
•Measure for hazardous voltage without the Low-Pass Filter.
WCaution
To prevent possible damage to the Meter or to the equipment
under test, follow these guidelines:
•Disconnect circuit power and discharge all high-voltage
capacitors before you do resistance, continuity, diodes, or
capacitance tests.
•Use the correct terminals, function, and range for all
measurements.
•Before you measure current, check the fuses of the Meter.
(See “Fuse Test”.)

28 II Ex
Calibration Information
4
Electrical Symbols
Table 1 is a list of electrical symbols that appear in this document and on the Meter.
Table 1. Symbols
AC (Alternating Current) JEarth ground
DC (Direct Current) IFuse
XHazardous voltage PConforms to European Union directives.
WRisk of Danger. Important
information. See Manual. Diode
Battery. Low battery when
displayed. TDouble insulated
RContinuity test or continuity
beeper tone. Capacitance
CAT III
IEC Overvoltage Category III
CAT III equipment is designed to
protect against transients in
equipment in fixed-equipment
installations, such as distribution
panels, feeders and short
branch circuits, and lighting
systems in large buildings.
CAT IV
IEC Overvoltage Category IV
CAT IV equipment is designed to protect
against transients from the primary supply
level, such as an electricity meter or an
overhead or underground utility service.
(Conforms to ATEX directive. Conforms to relevant Australian standards.
®Inspected and licensed by TÜV
Product Services. ÆConforms to CAN/CSA-C22.2 No. 61010-1
2nd, + Amendment 1.
~Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for
recycling information.

Digital Multimeter
General Specifications
5
General Specifications
Maximum voltage between any
terminal and earth ground ........................................... 1000 V rms
WFuse for mA inputs .................................................. 440 mA, 1000 V FAST Fuse
WFuse for A inputs ..................................................... 11 A, 1000 V FAST Fuse
Display ........................................................................... 6000 counts, updates 4/sec (19,999 counts in high-resolution
mode).
Altitude
Operating.................................................................... 2,000 meters
Storage ....................................................................... 10,000 meters
Temperature
Operating.................................................................... -15 °C to 50 °C
Storage ....................................................................... -40 °C to +85 °C (without battery)
-40 °C to +60 °C (with battery)
Temperature coefficient ............................................... 0.05 X (specified accuracy) / °C (<18 °C or >28 °C)
Electromagnetic Compatibility (EN 61326-1:2005) .... In an RF field of 3 V/M, accuracy = specified accuracy +20
counts, except 600 μA dc range total accuracy = specified
accuracy +60 counts. Temperature not specified
Relative Humidity.......................................................... 0 % to 80 % (0 °C to 35 °C)
0 % to 70 % (35 °C to 50 °C)
Battery Type .................................................................. 3 AAA Alkaline batteries, NEDA 24A IEC LR03
Approved Batteries....................................................... Duracell Procell MN2400 LR03
Duracell Plus MN2400 LR03
Varta Max Tech No. 4703
Varta Industrial Alcaline No. 4003 (min. operating temperature is -
10 °C)
Eveready Energizer No. E92
Rayovac Alkaline AAA (U.S. Type)
Panasonic LR03XWA
Battery Life .................................................................... 400 hrs typical without backlight (Alkaline)
Vibration ........................................................................ Per MIL-PRF-28800 for a Class 2 instrument
Shock ............................................................................. 1 Meter drop per IEC 61010 (3 Meter drop with holster)
Size (H x W x L) ............................................................. 4.57 cm x 10.0 cm x 21.33 cm (1.80 in x 3.95 in x 8.40 in)
Size with Holster ........................................................... 6.35 cm x 10.0 cm x 19.81 cm (2.50 in x 3.95 in x 7.80 in)
Weight ............................................................................ 567.8 g (1.25 lb)
Weight with Holster and Flex-Stand............................ 769.8 g (1.70 lb)
Safety Compliance........................................................ Complies with ANSI/ISA S82.01-2004, CAN/CSA C22.2 61010-1-
04 to 600 V Measurement Category IV. Licensed by TÜV to
EN61010-1, Pollution degree 2
Certifications ................................................................. CSA, TÜV, P, , ATEX, IECEx
IP Rating ........................................................................ 67 (Non-operating. Protected against dust and the effect of
immersion up to 1 m for 30 min.)

28 II Ex
Calibration Information
6
Detailed Specifications
For all detailed specifications:
Accuracy is specified for 2 years after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at
0 % to 80 %. Accuracy specifications take the form of ±([% of Reading] + [Number of least-significant digits]). In the 4
½-digit mode, multiply the number of least-significant digits (counts) by 10.
AC Voltage
AC conversions are ac-coupled and valid from 3 % to 100 % of range.
Range Resolution Accuracy
45 – 65 Hz 30 – 200 Hz 200 – 440 Hz 440 Hz – 1 kHz 1 – 5 kHz 5 – 20 kHz
600.0 mV 0.1 mV ±(0.7 % + 4)
±(1.0 % + 4)
±(2 % + 4) ±(2 % + 20) [1]
6.000 V 0.001 V
60.00 V 0.01 V
±(0.7 % + 2)
±(2 % + 4) [2] Unspecified
600.0 V 0.1 V Unspecified
1000 V 1 V Unspecified Unspecified
Low-Pass Filter ±(1.0 % + 4) [1] +1.0 % + 4
-6.0 % - 4 [3] Unspecified Unspecified Unspecified
[1] Below 10 % of range, add 12 counts.
[2] Frequency range: 1 kHz to 2.5 kHz
[3] Specification increases from -1 % to -6 % at 440 Hz when filter is used.
DC Voltage, Conductance, and Resistance
Function Range Resolution Accuracy
mV dc 600.0 mV 0.1 mV ±(0.1 % + 1)
V dc
6.000 V 0.001 V
±(0.05 % + 1)
60.00 V 0.01 V
600.0 V 0.1 V
1000 V 1 V
Ω
600.0 Ω0.1 Ω±(0.2 % + 2) [2]
6.000 kΩ0.001 kΩ±(0.2 % + 1)
60.00 kΩ0.01 kΩ
600.0 kΩ0.1 kΩ±(0.6 % + 1)
6.000 MΩ0.001 MΩ
50.00 MΩ0.01 MΩ±(1.0 % + 3) [1,3]
nS 60.00 nS 0.01 nS ±(1.0 % + 10) [1,2,3]
[1] Add 0.5 % of reading when measuring above 30 MΩin the 50 MΩrange, and 20 counts below 33 nS in the 60 nS range.
[2] When using the rel function to compensate for offsets.
[3] >40 °C temperature coefficient is 0.1 x (specified accuracy)/°C.
Temperature
Range Resolution
Accuracy [1,2]
-200 °C to +1090 °C
-328 °F to +1994 °F
0.1 °C
0.1 °F
±(1.0 % + 10)
±(1.0 % + 18)
[1] Does not include error of the thermocouple probe.
[2] Accuracy specification assumes ambient temperature stable to ±1 °C. For ambient temperature changes of ±5 °C, rated accuracy
applies after 2 hours.

Digital Multimeter
Detailed Specifications
7
AC Current
Function Range Resolution Burden Voltage Accuracy
(45 Hz – 2 kHz) [1]
μA ac 600.0 μA 0.1 μA 100 μV/μA
±(1.0 % + 2)
6000 μA 1 μA 100 μV/μA
mA ac 60.00 mA 0.01 mA 1.8 mV/mA
400.0 mA [2] 0.1 mA 1.8 mV/mA
A ac 6.000 A 0.001 A 0.03 V/A
10.00 A [3,4] 0.01 A 0.03 V/A
[1] AC conversions are ac coupled, true rms responding, and valid from 3 % to 100 % of range, except 400 mA range. (5 % to 100 %
of range) and 10 A range (15 % to 100 % or range).
[2] 400 mA continuous. 600 mA for 18 hr maximum.
[3] W10 A continuous up to 35 °C. <20 minutes on, 5 minutes off at 35 °C to 55 °C. >10 A to 20 A for 30 seconds maximum, 5 minutes
off.
[4] >10 A accuracy unspecified.
DC Current
Function Range Resolution Burden Voltage Accuracy
μA dc 600.0 μA 0.1 μA 100 μV/μA ±(0.2 % + 4)
6000 μA 1 μA 100 μV/μA ±(0.2 % + 2)
mA dc 60.00 mA 0.01 mA 1.8 mV/mA ±(0.2 % + 4)
400.0 mA [1] 0.1 mA 1.8 mV/mA ±(0.2 % + 2)
A dc 6.000 A 0.001 A 0.03 V/A ±(0.2 % + 4)
10.00 A [2,3] 0.01 A 0.03 V/A ±(0.2 % + 2)
[1] 400 mA continuous; 600 mA for 18 hr maximum.
[2] W10 A continuous up to 35 °C. <20 minutes on, 5 minutes off at 35 °C to 55 °C. >10 A to 20 A for 30 seconds maximum, 5 minutes
off.
[3] >10 A accuracy unspecified.
Capacitance
Range Resolution Accuracy
10.00 nF 0.01 nF ±(1.0 % + 2) [1]
100.0 nF 0.1 nF
1.000 μF 0.001 μF
±(1.0 % + 2)
10.00 μF 0.01 μF
100.0 μF 0.1 μF
9999 μF 1 μF
[1] With a film capacitor or better, using the rel mode to zero residual.
Diode
Range Resolution Accuracy
2.000 V 0.001 V ±(2.0 % + 1)
Frequency
Range Resolution Accuracy
199.99 Hz 0.01 Hz
±(0.005 % + 1) [1]
1999.9 Hz 0.1 Hz
19.999 kHz 0.001 kHz
199.99 kHz 0.01 kHz
>200 kHz 0.1 kHz Unspecified
[1] From 0.5 Hz to 200 kHz and for pulse widths > 2 μs.

28 II Ex
Calibration Information
8
Frequency Counter Sensitivity and Trigger Levels
Input Range Minimum Sensitivity (RMS Sine Wave) Approximate Trigger Level
(DC Voltage Function)
5 Hz – 20 kHz 0.5 Hz – 200 kHz
600 mV dc 70 mV (to 400 Hz) 70 mV (to 400 Hz) 40 mV
600 mV ac 150 mV 150 mV -
6 V 0.3 V 0.7 V 1.7 V
60 V 3 V 7 V (≤140 kHz) 4 V
600 V 30 V 70 V (≤14.0 kHz) 40 V
1000 V 100 V 200 V (≤1.4 kHz) 100 V
Duty Cycle (Vdc and mVdc)
Range Accuracy
0.0 % to 99.9 % [1] Within ±(0.2 % per kHz + 0.1 %) for rise times <1 μs.
[1] 0.5 Hz to 200 kHz, pulse width >2 μs. Pulse width range is determined by the frequency by the frequency of the signal.
Input Characteristics
Function Overload
Protection
Input
Impedance
(nominal)
Common Mode
Rejection Ratio
(1 kΩunbalance)
Normal Mode Rejection
L1000 V rms
10 MΩ<100 pF
> 120 dB at dc, 50 Hz
or 60 Hz > 60 dB at 50 Hz or 60 Hz
1000 V rms > 120 dB at dc, 50 Hz
or 60 Hz > 60 dB at 50 Hz or 60 Hz
K1000 V rms 10 MΩ< 100 pF
(ac-coupled) > 60 dB, dc to 60 Hz
Open Circuit
Test Voltage
Full Scale Voltage Typical Short Circuit Current
To 6 MΩ5 MΩor
60 nS 600 Ω6 kΩ60 kΩ600 kΩ6 MΩ50 MΩ
Ω1000 V rms <7.0 V dc <1.7 V dc <1.9 V dc 500 μA 100 μA 10 μA 1 μA 0.4 μA0.2μA
G1000 V rms <7.0 V dc 2.200 V dc 1.0 mA typical
MIN MAX Recording
Nominal Response Accuracy
100 ms to 80 %
(dc functions) Specified accuracy ±12 counts for changes >200 ms in duration
120 ms to 80 %
(ac functions) Specified accuracy ±40 counts for changes >350 ms and inputs >25 % of range
250 μs (peak) [1]
Specified accuracy ±100 counts for changes >250 μs in duration
(add ±100 counts for readings over 6000 counts)
(add ±100 counts for readings in Low Pass mode)
[1] For 6 V range: 1 ms

Digital Multimeter
Basic Maintenance
9
Basic Maintenance
XWWarning
To prevent possible electrical shock, fire, or personal injury:
•Have the Product repaired by ECOM Instruments GmbH or
an ECOM authorized service center to keep Product
certification.
•Do not operate the Product with covers removed or the case
open. Hazardous voltage exposure is possible.
General Maintenance
XWWarning
To prevent possible electrical shock, fire, or personal injury,
•Remove the input signals before you clean the Product.
•Use only specified replacement parts.
To clean the external surfaces of the Product, wipe the case with a damp cloth and mild
detergent. Do not use abrasives or solvents.
Dirt or moisture in the terminals can cause incorrect measurements and can falsely set off
the Input Alert feature. Clean the terminals as follows:
1. Turn off the Product and remove all test leads.
2. Shake out dirt that can be in the terminals.
3. Soak a clean swab with mild detergent and water. Move the swab around in each
terminal. Dry each terminal with canned air to push the water and detergent out of the
terminals.
It is recommended that the Product be calibrated by Fluke in 2 year intervals.
XWWarning
To prevent possible electrical shock or personal injury, use
only specified replacement fuses with the amperage, voltage,
and speed ratings shown in Table 3.
Fuse Test
As shown in Figure 1, with the Product in the Nfunction, put a test lead into the 
jack and place the probe tip on the other end of the test lead against the metal of the
current input jack. If LEAd appears in the display, the probe tip has been inserted too far
into the amps input jack. Lift the lead out a bit until the message no longer shows in the
display and 0L or a resistance measurement shows in the display. The resistance value
must be as shown in Figure 1. If the tests give measurements other than those shown,
have the Product serviced.

28 II Ex
Calibration Information
10
Touch top half
of input contacts
Good 11 A fuse: 0.0 Ω to
0.5 Ω
Replace fuse: OL
Good 0.44 A fuse: 0.995 kΩ to
1.005 kΩ
Replace fuse: OL
gaq105.eps
Figure 1. Current Fuse Test
Battery Replacement
Replace the batteries with three AAA batteries (NEDA 24A IEC LR03).
XWWarning
To prevent possible electrical shock, fire, or personal injury:
•Replace the batteries when the low battery indicator ()
shows to prevent incorrect measurements. If the display
shows “batt” the Product will not function until the
batteries are replaced.
•Use only three AAA 1.5 volt batteries, correctly installed to
power the Product. See the table on the subsequent page
for a list of approved batteries. All cells are to be replaced at
the same time with same part number cells in fresh air
locations only.
Replace the batteries as follows, refer to Figure 2:
1. Turn the rotary switch to OFF and remove the test leads from the terminals.
2. Remove the six Torx-head screws from the case bottom and remove the battery door
(item ).
Note
When you lift the battery door, make sure the rubber gasket stays attached
to the battery compartment barrier.
3. Remove the three batteries and replace all three with AAA Alkaline batteries
(item ).
4. Make sure the battery compartment gasket (item ) is properly installed around the