Fluke 189II/AN User manual

PN 3270465
February 2008, Rev. 1, 6/10
© 2008 - 2010 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
189II/AN
True-rms Digital Multimeter
Service Manual
Reproduction and distribution of this technical manual is
authorized for Government Purposes.

LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, 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 difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
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
To register your product online, visit http://register.fluke.com

i
Table of Contents
Title Page
Introduction........................................................................................................ 1
Contacting Fluke................................................................................................ 1
Precautions and Safety Information................................................................... 2
International Symbols ........................................................................................ 2
Safety Information ............................................................................................. 3
General Specifications ....................................................................................... 5
Detailed Specifications ...................................................................................... 5
AC Voltage Specifications ............................................................................ 6
AC Current Specifications............................................................................. 6
DC Voltage Specification.............................................................................. 6
DC Current Specifications............................................................................. 7
Resistance Specifications .............................................................................. 7
Temperature Specifications ........................................................................... 7
Capacitance and Diode Test Specifications................................................... 8
Frequency Counter Specifications................................................................. 8
Frequency Counter Sensitivity ...................................................................... 8
MIN MAX, Recording, and Peak Specifications .......................................... 9
Input Characteristics...................................................................................... 9
Burden Voltage (A, mA, μA) ........................................................................ 9
Unpacking the Meter ......................................................................................... 9
Inspection........................................................................................................... 9
Hazardous Voltage............................................................................................. 10
Required Equipment .......................................................................................... 10
Theory of Operation........................................................................................... 11
Analog Signal Conditioning .......................................................................... 11
Control Section.............................................................................................. 11
Power Supply................................................................................................. 11
Block Diagram................................................................................................... 12
Testpoint Locations............................................................................................ 12
Fault Isolation Techniques................................................................................. 12
Wear Tolerance.................................................................................................. 12
Trouble Symptoms............................................................................................. 12
Logic .................................................................................................................. 12
Restoration Actions............................................................................................ 12
Basic Maintenance............................................................................................. 13
Opening the Meter Case ................................................................................ 13

189II/AN
Service Manual
ii
Removing and Reinserting the Printed Circuit Assembly............................. 13
Reassembling the Meter Case........................................................................ 14
Testing Fuses (F1 and F2) ............................................................................. 14
Replacing Fuses............................................................................................. 15
Replacing the Batteries.................................................................................. 15
Cleaning......................................................................................................... 16
Performance Tests.............................................................................................. 16
Factory Default.............................................................................................. 17
Power LED Test ............................................................................................ 17
Backlight Test................................................................................................ 17
Current Terminal Sensing Test...................................................................... 17
Keypad Test................................................................................................... 17
LCD Test ....................................................................................................... 17
IR Port Verification ....................................................................................... 18
Temperature Accuracy Test........................................................................... 18
Accuracy Tests for Volts, Current, Ω, E, and GTest Functions ............... 19
Calibration Adjustment...................................................................................... 22
Operation ....................................................................................................... 23
Entering the Password ................................................................................... 23
Changing the Password ................................................................................. 23
Restoring Factory Default Password ............................................................. 23
Calibration Adjustment Procedure ................................................................ 24
Screenshot Description.............................................................................. 24
Softkeys..................................................................................................... 25
Navigation Buttons.................................................................................... 25
Mode Buttons............................................................................................ 25
Description of Calibration Adjustment Steps............................................ 25
Power Cycle .............................................................................................. 26
Calibration Adjustment Steps........................................................................ 26
Parts ................................................................................................................... 31
Schematic Diagrams .......................................................................................... 33

iii
List of Tables
Table Title Page
1. Symbols.................................................................................................................. 2
2. Required Equipment............................................................................................... 10
3. Temperature Test Input and Display...................................................................... 19
4. 189II/AN Performance Test Steps ......................................................................... 19
5. Calibration Entry Soft Keys ................................................................................... 23
6. Softkey Functions during Calibration .................................................................... 25
7. Calibration Adjustment Steps for Firmware Version 1.00..................................... 26
8. Calibration Adjustment Steps for Firmware Version 1.10..................................... 28
9. Replacement Parts.................................................................................................. 31

189II/AN
Service Manual
iv

v
List of Figures
Figure Title Page
1. Fluke 189II/AN Block Diagram............................................................................. 12
2. Testing the Current Fuses....................................................................................... 15
3. Battery and Fuse Replacement............................................................................... 16
4. PCA Component Location ..................................................................................... 24
5. Calibration Adjustment Screenshot........................................................................ 24
6. Replacements Parts ................................................................................................ 32
7. Schematic Diagrams............................................................................................... 33

189II/AN
Service Manual
vi

1
Introduction
XW Warning
To avoid shock or injury, do not perform the verification tests
or calibration procedures described in this manual unless you
are qualified to do so.
The information provided in this document is for the use of
qualified personnel only.
WCaution
The 189II/AN True-rms Digital Multimeter contains parts that
can be damaged by static discharge.
Follow the standard practices for handling static sensitive
devices.
The information in this manual deals with the Fluke Model 189II/AN True-rms Digital
Multimeter, (hereafter referred to as “the Meter”). Information provided includes:
•Precautions and safety information
•Specifications
•Basic maintenance (cleaning, replacing the battery and fuses)
•Performance test procedures
•Calibration and calibration adjustment procedures
•Accessories and replaceable parts
For complete operating instructions, refer to the Model 189II/AN Users Manual located
on the 189II/AN CD ROM.
Contacting Fluke
To order accessories, receive assistance, or locate the nearest Fluke distributor or Service
Center, call:
USA: 1-888-44-FLUKE (1-888-443-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]

189II/AN
Service Manual
2
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
Precautions and Safety Information
XWWarning
To avoid possible electric shock or personal injury, use this
Meter only as specified in this manual or the protection
provided by the equipment might be impaired.
Read the “Safety Information” page before servicing this product.
In this manual, a Warning identifies conditions and actions that pose hazard(s) to the
user; a Caution identifies conditions and actions that may damage the Meter or the test
instruments.
International Symbols
International symbols used on the Meter and in this manual are explained in Table 1.
Table 1. Symbols
Symbol Description Symbol Description
BAC (Alternating Current or Voltage) IFuse
FDC (Direct Current or Voltage) TDouble Insulated
XHazardous voltage WImportant Information; refer to
manual
Battery (Low battery when shown
on the display) JEarth ground
RContinuity test or continuity beeper
tone $Conforms to relevant Canadian and US standards
PConforms to European Union
directives ;Conforms to relevant Australian standards
tUnderwriters Laboratory listed
product ®Inspected and licensed by TÜV Product Services
CAT III
IEC Measurement 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 Measurement 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.
YHazardous voltage present on input
of Meter. ~
Do not dispose of this product as
unsorted municipal waste. Go to
Fluke’s website for recycling
information.

True-rms Digital Multimeter
Safety Information
3
Safety Information
The Meter complies with:
•ANSI/ISA 82.02.01 (61010-1) 2004
•UL 61010-1:2004
•CAN/CSA-C22.2 No. 61010-1-04
•IEC/EN 61010-1 2nd Edition Pollution Degree 2
•EMC EN 61326-1
•Measurement Category III, 1000V, Pollution Degree 2
•Measurement Category IV, 600 V, Pollution Degree 2
In this manual, a Warning identifies hazardous conditions and actions that could cause
bodily harm or death. A Caution identifies conditions and actions that could damage the
Meter, the equipment under test, or cause permanent loss of data.
XWWarning
To avoid possible electric shock or personal injury, follow these
guidelines:
•Use this Meter only as specified in this manual or the
protection provided by the Meter might be impaired.
•Do not use the Meter if it is damaged. Before you use the
Meter, inspect the case. Look for cracks or missing plastic.
Pay particular attention to the insulation surrounding the
connectors.
•Make sure the battery door is closed and latched before
operating the Meter.
•Remove test leads from the Meter before opening the
battery door.
•Inspect the test leads for damaged insulation or exposed
metal. Check the test leads for continuity. Replace damaged
test leads before using the Meter.
•Do not apply more than the rated voltage, as marked on the
Meter, between the terminals or between any terminal and
earth ground.
•Never operate the Meter with the cover removed or the case
open.
•Use caution when working with voltages above 30 V ac rms,
42 V ac peak, or 60 V dc. These voltages pose a shock
hazard.
•Use only the replacement fuses specified by the manual.
•Use the proper terminals, function, and range for
measurements.
•Avoid working alone.

189II/AN
Service Manual
4
•When measuring current, turn off circuit power before
connecting the Meter in the circuit. Remember to place the
Meter in series with the circuit.
•When making electrical connections, connect the common
test lead before connecting the live test lead; when
disconnecting, disconnect the live test lead before
disconnecting the common test lead.
•Do not use the Meter if it operates abnormally. Protection
may be impaired. When in doubt, have the Meter serviced.
•Do not operate the Meter around explosive gas, vapor, or
dust.
•Use only 1.5 V AA batteries, properly installed in the Meter
case, to power the Meter.
•When servicing the Meter, use only specified replacement
parts.
•When using probes, keep fingers behind the finger guards
on the probes.
•Only use test leads that have the same voltage, category,
and amperage ratings as the meter and that have been
approved by a safety agency.
•Use proper protective equipment, as required by local or
national authorities, when working in hazardous areas.
•Comply with local and national safety requirements when
working in hazardous locations.
WCaution
To avoid possible damage to the Meter or to the equipment
under test, follow these guidelines:
•Disconnect circuit power and discharge all high-voltage
capacitors before testing resistance, continuity, diodes, or
capacitance.
•Use the proper terminals, function, and range for all
measurements.
•Do not remove batteries while the Meter is turned on or a
signal is applied to the Meter’s input jacks.
•Before measuring current, check the Meter's fuses. (See
"Testing the Fuses" in the Users Manual on the
accompanying CD.)

True-rms Digital Multimeter
General Specifications
5
General Specifications
Maximum voltage between any Terminal and Earth Ground: 1000 V
WFuse Protection for mA or μA inputs............. 0.44 A (44/100 A, 440 mA), 1000 V FAST Fuse, Fluke specified part
only
WFuse Protection for A input ............................ 11 A, 1000 V FAST Fuse, Fluke specified part only
Battery Type .......................................................... 6 AA Alkaline batteries, NEDA 15A IEC LR6
Battery Life ............................................................ 100 hours minimum. 200 hours in Logging mode
Temperature
Operating ............................................................ -20 °C to 55 °C
Storage ............................................................... -40 °C to 60 °C
Relative Humidity.................................................. 0 % to 90 % (0 °C to 37 °C), 0 % to 65 % (37 °C to 45 °C), 0 % to 45 %
(45 °C to 55°C)
Altitude
Operating ............................................................ 3,000 m
Storage ............................................................... 10,000 m
Temperature Coefficient....................................... 0.05 X (specified accuracy) /°C (<18 °C or >28 °C)
Vibration ................................................................ Random Vibration per MIL-PRF-28800F Class 2
Shock ..................................................................... 1 meter drop per IEC/EN 61010-1 2nd Edition
Size (HxWxL) ......................................................... 22.2 cm x 10.2 cm x 6.0 cm (8.75 in x 4.03 in x 2.38 in)
Weight .................................................................... 28.0 oz (871 g)
Safety Standards
US ANSI.............................................................. Complies with ANSI/ISA 82.02.01 (61010-1) 2004
CSA..................................................................... CAN/CSA-C22.2 No 61010-1-04 to 1000 V Measurement Category III
and 600 V Measurement Category IV, Pollution Degree 2
UL ....................................................................... UL 61010-1:2004
CE European ...................................................... IEC/EN 61010-1 2nd Edition Pollution Degree 2
Electromagnetic Compatibility Standards (EMC)
European EMC ................................................... EN61326-1
Australian EMC ................................................... ;N10140
US FCC............................................................... FCC CFR47: Part 15 CLASS A
Certifications ......................................................... UL, CE, CSA, ;(N10140), ®
Detailed Specifications
Accuracy:
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
90 %. Accuracy specifications are given as: ±( [ % of reading ] + [ number of least significant digits ] ). Accuracy
specification assumes ambient temperature is stable at ±1 °C. For ambient temperature changes of ±5 °C, rated accuracy
applies after 2 hours.
True-rms:
AC mV, AC V, AC μA, AC mA, and AC A specifications are ac-coupled, true rms, and are specified from 2 % of range to
100 % of range, except 10 A range is specified from 10 % to 100 % of range.
Crest Factor:
Accuracy is specified with AC crest factor ≤3.0 at full-scale, increasing linearly to 5.0 at half-scale, except the 1000 V
range, where it is 1.5 at full scale, increasing linearly to 3.0 at half-scale and 500 mV and 5000 μA, where it is ≤3.0 at
80 % of full scale, increasing linearly to 5.0 at half-scale. For non-sinusoidal waveforms add ±(0.3 % of range and 0.1 % of
reading).
AC Floor:
When the input leads are shorted together in the ac functions, the Meter may display a residual reading up to 200 counts.
A 200 count residual reading will cause only a 20 count change for readings at 2 % of range. Using REL to offset this
reading may produce a much larger constant error in later measurements.
AC+DC:
AC+DC is defined as 22 dcac +

189II/AN
Service Manual
6
AC Voltage Specifications
Accuracy
Function Range Resolution
20 to 45 Hz 45 to 65 Hz 65 Hz to 10
kHz 10 to 20 kHz 20 to 100 kHz
50 mV [1] 0.001 mV 1.5 % + 60 0.3 % + 25 0.4 % + 25 0.7 % + 40 3.5 % + 40 [3] AC mV
500 mV 0.01 mV 1.5 % + 60 0.3 % + 25 0.4 % + 25 0.7 % + 40 3.5 % + 40
5 V[1] 0.0001 V 1.5 % + 60 0.3 % + 25 0.6 % + 25 1.5 % + 40 3.5 % + 40 [3]
50 V[1] 0.001 V 1.5 % + 60 0.3 % + 25 0.4 % + 25 0.7 % + 40 3.5 % + 40
500 V[1] 0.01 V 1.5 % + 60 0.3 % + 25 0.4 % + 25 Not Spec’d Not Spec’d
AC V
1000 V 0.1 V 1.5 % + 60 0.3 % + 25 0.4 % + 25 Not Spec’d Not Spec’d
-70 to -62 dB
[2]
0.01 dB 3 dB 1.5 dB 2 dB 2 dB 3 dB
-62 to -52 dB
[2]
0.01 dB 1.5 dB 1.0 dB 1 dB 1 dB 2 dB
-52 to -6 dB
[2]
0.01 dB 0.2 dB 0.1 dB 0.1 dB 0.2 dB 0.8 dB
-6 to +34 dB
[2]
0.01 dB 0.2 dB 0.1 dB 0.1 dB 0.2 dB 0.8 dB
dBV
34 to 60 dB
[2]
0.01 dB 0.2 dB 0.1 dB 0.1 dB Not Spec’d Not Spec’d
[1] Below 5 % of range, add 20 counts.
[2] dBm (600 Ω) is specified by adding +2.2 dB to the dBV range values.
[3] Add 2.5 % above 65 kHz.
See Detailed Specifications introduction for additional information.
AC Current Specifications
Accuracy
Function Range Resolution
20 to 45 Hz 45 to 1 kHz 1 to 20 kHz 20 to 100 kHz [4]
500 μA 0.01 μA 1 % + 20 0.6 % + 20 0.6 % + 20 5 % + 40 AC μA [3]
5000 μA 0.1 μA 1 % + 5 0.6 % + 5 0.6 % + 10 5 % + 40
50 mA 0.001 mA 1 % + 20 0.6 % + 20 0.6 % + 20 5 % + 40AC mA [3]
400 mA 0.01 mA 1 % + 5 0.6 % + 5 1.5 % + 10 5 % + 40
5 A 0.0001 A 1.5 % + 20 0.8 % + 20 3 % + 40 [4] Not Spec’dAC A [2]
10 A [1] 0.001 A 1.5 % + 5 0.8 % + 5 3 % + 10 [4] Not Spec’d
[1] 10 A range (10 % to 100 % of range).
[2] 20 A for 30 seconds on, 10 minutes off. >10 A not specified.
[3] 400 mA continuous; 550 mA for 2 minutes on, 1 minute off.
[4] Verified by design and type tests.
See Detailed Specifications introduction for additional information.
DC Voltage Specification
Accuracy
AC over DC, DC over AC, AC + DC [2]
Function Range Resolution DC [2] 20 to 45 Hz 45 Hz to 1
kHz 1 to 20 kHz 20 to 35 kHz
50 mV [3] 0.001 mV 0.05 % + 20 [4] 1.5 % + 40 5 % + 40DC mV
500 mV 0.01 mV 0.025 % + 2 [5] 1.5 % + 40 5 % + 40
5 V 0.0001 V 0.025 % + 2 1.5 % + 40 5 % + 40
50 V 0.001 V 0.025 % + 2 1.5 % + 40 5 % + 40
500 V 0.01 V 0.03 % + 2 Not Spec’d Not Spec’d
DC V[1]
1000 V 0.1 V 0.03 % + 2
2 % + 80 0.5 % + 80
Not Spec’d Not Spec’d
[1] Add 20 counts in dual display ac over dc, dc over ac or ac+dc.
[2] AC+DC ranges are specified from 2 % to 140 % of range, except 1000 V is specified from 2 % to 100 % of range.
[3] When using the relative mode (REL ) to compensate for offsets.
[4] Add 4 counts/10 mV AC in dual display ac over dc, dc over ac or ac + dc
[5] Add 10 counts/100 mV AC in dual display ac over dc, dc over ac or ac + dc.

True-rms Digital Multimeter
Detailed Specifications
7
DC Current Specifications
Accuracy
AC over DC, DC over AC, AC + DC [1]
Function Range Resolution
DC [1][3] 20 to 45 Hz 45 Hz to 1
kHz 1 to 20 kHz 20 to 100 kHz
[5]
500 μA 0.01 μA 0.075 % + 20 1 % + 20 0.6 % + 20 0.6 % + 20 5 % + 40 DC μA [4]
5000 μA 0.1 μA 0.075 % + 2 1 % + 5 0.6 % + 5 0.6 % + 10 5 % + 40
50 mA 0.001 mA 0.05 % + 10 [6] 1 % + 20 0.6 % + 20 0.6 % + 20 5 % + 40DC mA [4]
400 mA 0.01 mA 0.15 % + 2 1 % + 5 0.6 % + 5 1.5 % + 10 5 % + 40
5 A 0.0001 A 0.3 % + 10 1.5 % + 20 0.8 % + 20 3 % + 40 [5] Not Spec’dDC A [2]
10 A 0.001 A 0.3 % + 2 1.5 % + 10 0.8 % + 10 3 % + 10 [5] Not Spec’d
[1] AC+DC ranges are specified from 2 % to 140 % of range.
[2] 20 A for 30 seconds on, 10 minutes off. >10 A not specified.
[3] Add 20 counts in dual display ac over dc, dc over ac or ac+dc.
[4] 400 mA continuous; 550 mA for 2 minutes on, 1 minute off.
[5] Verified by design and type tests.
[6] Temperature coefficient: 0.1 X (specified accuracy)/ °C (<18 °C or > 28 °C)
Resistance Specifications
Function Range Resolution Accuracy
500 Ω[1] 0.01 Ω0.05 % + 10
5 kΩ[1] 0.0001 kΩ0.05 % + 2
50 kΩ[1] 0.001 kΩ0.05 % + 2
500 kΩ0.01 kΩ0.05 % + 15
5 MΩ0.0001 MΩ0.15 % + 4
30 MΩ0.001 MΩ1.5 % + 4
50 MΩ0.01 MΩ1.5 % + 4
50 MΩup to 100 MΩ0.1 MΩ3.0 % + 2
Resistance
100 MΩup to 500 MΩ0.1 MΩ8 % + 2
Conductance 50 nS
[2] 0.01 nS 1 % + 1 0
[1] When using the relative mode (REL ) to compensate for offsets.
[2] Add 20 counts above 33 nS in 50 nS range.
Temperature Specifications
Temperature Resolution Accuracy
[1,2]
-200 °C to +1350 °C 0.1 °C 1 % + 10
-328 °F to +2462 °F 0.1 °F 1 % + 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.
Capacitance and Diode Test Specifications
Function Range Resolution Accuracy
1 nF [1] 0.001 nF 1 % + 5
10 nF [1] 0.01 nF 1 % + 5
100 nF [1] 0.1 nF 1 % + 5
1 μF 0.001 μF 1 % + 5
10 μF 0.01 μF 1 % + 5
100 μF0.1 μF 1 % + 5
1000 μF 1 μF 1 % + 5
10 mF 0.01 mF 1 % + 5
Capacitance
100 mF 0.1 mF 2 % + 20
Diode Test 3.1 V 0.0001 V 1 % + 20
[1] With a film capacitor or better, using relative mode (REL Δ) to zero residual.

189II/AN
Service Manual
8
Frequency Counter Specifications
Function Range Resolution Accuracy
99.999 Hz 0.001 Hz 0.02 % + 5
999.99 Hz 0.01 Hz 0.005 % + 5
9.9999 kHz 0.0001 kHz 0.005 % + 5
99.999 kHz 0.001 kHz 0.005 % + 5
Frequency
(0.5 Hz to 999.99 kHz, pulse
width >0.5 μs)
999.99 kHz 0.01 kHz 0.005 % + 5
Duty Cycle [1][2][3] 1.00 % to 99.00 % 0.01 % 0.2 % per kHz + 0.1 %
0.1000 ms 0.0001 ms 0.002 ms + 30 counts
1.000 ms 0.001 ms 0.002 ms + 3 counts
10.00 ms 0.01 ms 0.002 ms + 3 counts
Pulse Width [1][2]
1999.9 ms 0.1 ms 0.002 ms + 3 counts
[1] For rise times <1 μs. Signals centered around trigger levels.
[2] 0.5 to 200 kHz, pulse width >2 μs. Pulse width range is determined by the frequency of the signal.
[3] For 10 μs < pulse width <25 μs add 1%. For 2 μs < pulse width ≤10 μs add 3.5 %.
Frequency Counter Sensitivity
Approximate Voltage Sensitivity
(rms sine wave) [1]
Input Range
15 Hz to 100 kHz
AC Bandwidth[2] Approximate DC
Trigger Levels DC Bandwidth [2]
50 mV 5 mV 1 MHz 5 mV & 20 mV 600 kHz
500 mV 25 mV 1 MHz 20 mV & 60 mV 1 MHz
5 V 0.25 V 700 kHz 1.4 V & 2.0 V 80 kHz
50 V 2.5 V 1 MHz 0.5 V & 6.5 V 1 MHz
500 V 25 V 300 kHz 5 V & 40 V 300 kHz
1000 V 50 V 300 kHz 5 V & 100 V 300 kHz
Approximate Current Sensitivity
(rms sine wave)
Input Range
15 Hz to 10 kHz
AC Bandwidth Approximate DC
Trigger Levels DC Bandwidth
500 μA 25 μA 100 kHz
5000 μA 250 μA 100 kHz
50 mA 2.5 mA 100 kHz
400 mA 25 mA 100 kHz
5 A 0.25 A 100 kHz
10 A 1.0 A 100 kHz
NA NA
[1] Maximum input = 10 x range (1000 V maximum, 2 x 107V-Hz product maximum). Noise at low frequencies and amplitudes may
affect accuracy.
[2] Typical frequency bandwidth with full scale (or maximum 2 x 107V-Hz product) rms sine wave.
MIN MAX, Recording, and Peak Specifications
Function Nominal Response Accuracy
200 ms to 80 % (dc function) Specified accuracy ±12 counts for changes >425 ms in duration
in manual range.
MIN MAX, Recording
350 ms to 80 % (ac function) Specified Accuracy ±40 counts for changes >1.5 s in duration in
manual range.
Peak 250 μS (peak) [1]
Specified accuracy ±100 counts [2] up to 5,000 count (full range)
reading. For higher peak reading (to 12,000 counts), specified
accuracy ±2 % [3] of reading.
Crest Factor 350 ms to 80 % For periodic waveforms from 50 to 440 Hz ± (4 % + 1 count).
[1] For repetitive peaks; 2.5 ms for single events. Peak not specified for 500 µA DC, 50 mA DC, 5 A DC.
[2] 200 counts in 500 mV AC, 500 μA AC, 50 mA AC, 5 A AC.
[3] 3 % in 500 mV AC, 500 μA AC, 50 mA AC, 5 A AC.

True-rms Digital Multimeter
Unpacking the Meter
9
Input Characteristics
Function Overload
Protection [1]
Input
Impedance
Common Mode
Rejection Ratio
(1 kΩunbalance)
Normal Mode Rejection
L1000 V 10 MΩ<100 pF >120 dB at dc,
50 Hz or 60 Hz >60 dB at 50 Hz or 60 Hz
F
mV 1000 V [2] 10 MΩ<100 pF >120 dB at dc,
50 Hz or 60 Hz >60 dB at 50 Hz or 60 Hz
K1000 V 10 MΩ<100 pF
(ac-coupled) >60 dB, dc to 60 Hz
Full Scale Voltage Typical Short Circuit Current
Function Overload
Protection [1]
Open Circuit
Test Voltage To
500 kΩ
≥5 MΩor
50 nS
500 Ω5 kΩ50 kΩ500 kΩ5 MΩ50 MΩ500 MΩ
e1000 V [2] 5 V dc 550 mV <5 V 1 mA 100 μA 10 μA1 μA 1 μA 0.3 μA 0.3 μA
G1000 V [2] 5 V dc 3.1 V dc 1 mA
[1] Input is limited to the product of a V rms sinewave times frequency of 2 x 107V-Hz.
[2] For circuits <0.5 A short circuit. 660V for high energy circuits.
Burden Voltage (A, mA, μ A)
Function Range Burden Voltage
500 μA 102 μV/ μA
5000 μA 102 μV/ μA
50.000 mA 1.8 mV/mA
mA, μA
400.00 mA 1.8 mV/mA
5.0000 A 0.04 V/AA
10.000 A 0.04 V/A
Unpacking the Meter
Open the Multimeter box. Inside will be found a 189II/AN Digital Multimeter, one set of
test leads, a Product Manuals CD, a 189II/AN Users Manual, and a 189II/AN Service
Manual. Remove the Meter from its plastic wrapping.
Inspection
Inspect all contents for any visible shipping damage. Look for scratches or any other
damage. If the Meter is damaged, contact Fluke immediately using the contact
information listed in the “Contacting Fluke” section earlier in this manual. If it is
necessary to return the Meter, place it in its original packaging and return.

189II/AN
Service Manual
10
Hazardous Voltage
To alert you to the presence of a potentially hazardous voltage, when the Meter detects a
voltage ≥30 V or a voltage overload (OL), the Ysymbol is displayed.
Required Equipment
Required equipment is listed in Table 2. If the recommended models are not available,
equipment with equivalent specifications may be used.
Repairs or servicing should be performed only by qualified personnel.
Table 2. Required Equipment
Equipment Required Characteristics
Recommended
Model
Calibrator AC Voltage Range: 0-1000 Vac
Accuracy: ±0.0875 %
Frequency Range: 20 Hz – 100 kHz
Accuracy:±3 %
DC Voltage Range: 0-1000 Vdc
Accuracy: ±0.0075 %
Current Range: 0-10A
Accuracy: AC mA - ±0.15 %
AC A - ±0.21 %
Frequency range: 1 kHz – 30 kHz
DC mA - +0.0175 %
DC A - ±0.08 %
Frequency Source: 45 Hz-950 kHz
Accuracy: ±0.0026 %
Amplitude: 600 mV
Accuracy: ±5 %
Ohms Range: 0 Ω- 300 MΩ
Accuracy: ±0.0135 %
Capacitance Range: 5 nF
Accuracy: ±0.55 %
Temperature Range: 0 to 1000 °C
Accuracy: 0.2 %
Fluke 5520A
Thermocouple Adapter
Accessory
K-type Fluke 80AK
K-type Thermocouple wire K-type, mini-plug on both ends N/A
Serial Cable, Infrared Cable, Adapter, Fluke-Custom IRDA Optical to USB,2M Fluke P/N 2166275

True-rms Digital Multimeter
Theory of Operation
11
Theory of Operation
The Meter includes the following major modules: Case, Display Module, Batteries,
Shields, and the Printed Circuit Assembly (PCA).
All the electrical processing is done on the PCA.
There are four main sections of the PCA: analog signal conditioning and conversion,
measurement processor, memory, and power supply.
Analog Signal Conditioning
The Analog Signal Conditioning section converts all levels of voltage and currents, AC
and DC, at the input terminals to a DC voltage that is read by the Analog to Digital
Converter (ADC). It also provides the stimulus current and voltages for the Ohms,
Continuity, Diode Test and Capacitance functions. This section provides protection
against overloads on the input terminals.
The Analog Signal Conditioning section is controlled by the measurement processor. It
gets the range and function from the master control section. It, in turn, sets up all the
analog switches, starts the ADC, reads the ADC, and sends this back to the control
processor. It has timers to count for the frequency functions. It monitors and reports back
to the control processor the position of the rotary switch, the level of the battery, and the
use of the current jacks.
Control Section
The Control Section contains a μP and memory. It receives information on the position of
the rotary selector switch, key presses, and measurement μP data. It outputs range and
function selection to the measurement μP and data to the display module. It also reads
from and writes to memory.
Power Supply
This section takes the battery voltage from the six AA cells, which can be from 6 to
9 volts, and creates 1.8 V, 2.5 V, 3 V, 5 V and 20 V which are switched on and off. It
also creates a 3 V supply that is always on.

189II/AN
Service Manual
12
Block Diagram
A block diagram of the 189II/AN is shown in Figure 1.
Switches
SPI
Control uP
Flash Mgmt
Volts
Com
mA/uA
Amps
P1
P2
P3
P4
RSOB
(Rotary
Switch on
Board)
Input
Overload
Protection
Signal
Division
(R-nets)
RMS– DC
Converter
DC Filter
for AC
Path
Signal
Conditioning
Precision
ADC
FADC
Amp/Filter
Power
Supply
24
Vbatt
5.0
3.0
2.5
1.8
VSS
LCD
Measurement uP
12 bit ADC
Timers
SPI
Other
Buttons
Beeper Backlight
Flash
and
PSRAM
Memory
LCD
Bias
On/Off
Button,
Rotary
Switch,
Jack
Detect
fet36.eps
Figure 1. Fluke 189II/AN Block Diagram
Testpoint Locations
Not available for this Meter.
Fault Isolation Techniques
Not available for this Meter. If the Meter needs service, refer to the “Contacting Fluke”
section.
Wear Tolerance
Not applicable for this Meter.
Trouble Symptoms
Not available for this Meter.
Logic
Not available for this Meter.
Restoration Actions
Refer to the “Performance Tests” section.