Fluke 12, 11, 10 Service Manual
10,11,12
®
Multimeters
Service
PN 900824
March 1992 Rev.1, 7/93
© 1992-1993 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of thei r r espective c omp ani es.
WARRANTY
Fluke warrants to the original product purchaser that each product it manufactures will
be free from defects in material and workmanship under normal use and service. The
warranty period is controlled by the warranty document furnished with each product and
begins on the date of shipment. Fluke’s warranty does not apply to fuses, batteries,
CRTs or any product which, in Fluke’s opinion, has been misused, altered, neglected, or
damaged by accident or abnormal conditions of operation or handling.
To obtain warranty service in the USA, call 1-888-99-FLUKE (1-888-993-5853). Outside
the USA, contact your nearest Fluke sales or service representative. Fluke assumes no
risk for damage in transit. Fluke will, at its option, repair or replace the defective product
free of charge or refund the purchase price. However, if Fluke determines that the failure
was caused by misuse, alteration, accident, or abnormal condition of operation or
handling, you will be billed for the repair and the repaired product will be returned to you
transportation prepaid.
THIS WARRANTY IS EXCLUSIVE 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
OR USE. FLUKE WILL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES OR LOSS OF DATA, WHETHER IN CONTRACT,
TORT, OR OTHER WISE.
Some states do not allow the exclusion or limitation of incidental or consequential
damages, or implied warranty periods, so the above limitations may not apply to you.
Other rights may vary from state to state.
Fluke Corporation Fluke Europe B.V
P.O. Box 9090 P.O. Box 1186
Everett, WA 98206-9090 5602 BD Eindhoven
U.S.A. The Netherlands
MULTIMETER SAFETY
The Fluke 10, 11, 12 Multimeters have been designed and tested according to IEC
Publication 348, Safety Requirements for Electronic Measuring Apparatus. This manual
contains information and warnings which must be followed to ensure safe operation and
retain the meter in safe condition. Use of this equipment in a manner not specified herein
may impair the protection provided by the equipment.
These mutimeters comply with part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) these multimeters may not cause harmful interference, and
(2) these multimeters must accept any interference received, including interference that
may cause undesired operation.
Some common international electrical symbols used in this manual are shown below.
B
F
D
I
AC - ALTERNATING
CURRENT
DC - DIRECT
CURRENT
EITHER AC OR DC
CURRENT
FUSE
DANGEROUS
Y
VOLTAGE
EARTH GROUND
J
SEE EXPLANATION
W
IN MANUAL
DOUBLE INSULATION
T
FOR PROTECTION
AGAINST ELECTRIC
SHOCK
Before using the meter, read the following safety information carefully. In this manual,
"WARNING," is reserved for conditions and actions that pose hazard(s) to the user;
"CAUTION," is reserved for conditions and actions that may damage your meter.
• Avoid working alone
• Follow all safety procedures for equipment being tested.
• Inspect the test leads for damaged insulation or exposed metal. Check test lead
continuity. Damaged leads should be replaced.
• Be sure the meter is in good operating condition.
• Select the proper function for your measurement.
• To avoid electrical shock, use caution when working above 60V dc or 30V ac RMS.
• Disconnect the live test lead before disconnecting the common test lead.
• Disconnect the power and discharge high-voltage capacitors before testing in Ω and
LR.
• When making a current measurement, turn the circuit power off before connecting
the meter in the circui t.
• Check meter fuses before measuring transformer secondary or motor winding
current. An open fuse may allow high voltage build-up, which is potentially
hazardous.
• Use clamp-on probes when measuring circuits exceeding 10 amps.
• When servicing the meter, use only the replacement parts specified.
• Do not allow meter to be used if it is damaged or if its safety is impaired.
Table of Contents
Chapter Title Page
1 Introduction and Specifications........................................................ 1-1
1-1. Introduction........................................................................................... 1-1
1-2. Specifications........................................................................................ 1-1
2 Theory of Operation........................................................................... 2-1
2-1. Introduction........................................................................................... 2-3
2-2. Theory of Operation.............................................................................. 2-3
2-3. Analog Measurement IC (U1).......................................................... 2-3
2-4. Microcomputer IC (U2).................................................................... 2-3
2-5. VCHEK Input Resistance................................................................. 2-3
3 Maintenance........................................................................................ 3-1
3-1. Introduction........................................................................................... 3-3
3-2. Disassembly and Reassembly............................................................... 3-3
3-3. Cleaning................................................................................................ 3-7
3-4. Performance Tests................................................................................. 3-7
3-5. Calibration ............................................................................................ 3-8
4 Replaceable Parts and Schematics................................................... 4-1
4-1. Introduction........................................................................................... 4-3
4-2. How To Obtain Parts ............................................................................ 4-3
4-3. Schematics............................................................................................ 4-3
4-4. Warranty and Service Centers .............................................................. 4-4
i
List of Tables
Table Title Page
1-1. Specifications......................................................................................................... 1-2
2-1. Electrical Components on Main PCA.................................................................... 2-4
2-2. U1 Pinout Table ..................................................................................................... 2-5
3-1. Required Equipment............................................................................................... 3-7
3-2. Performance Tests for Fluke 10............................................................................. 3-9
3-3. Performance Tests for Fluke 11 and 12.................................................................. 3-10
4-1. Final Assembly....................................................................................................... 4-5
4-2. A1 Main PCA......................................................................................................... 4-7
iii
List of Figures
Figure Title Page
2-1. Typical VCHEK Input Resistance with DC Volts Function Selected ................... 2-7
3-1. Disassembled Unit.................................................................................................. 3-4
3-2. Removing and Reinserting the Printed Circuit Assembly...................................... 3-5
3-3. Calibration Adjustment.......................................................................................... 3-10
4-1. Final Assembly Drawing........................................................................................ 4-6
4-2. A1 Main PCA Components.................................................................................... 4-9
4-3. Fluke 10 Schematic................................................................................................ 4-10
4-4. Fluke 11 Schematic................................................................................................ 4-12
4-5. Fluke 12 Schematic................................................................................................ 4-14
v
Chapter 1
Introduction and Specifications
Title Page
1-1. Introduction........................................................................................... 1-3
1-2. Specifications........................................................................................ 1-3
1-1
1-1. Introduction
SERVICE PROCEDURES DESCRIBED HEREIN SHOULD BE
PERFORMED BY QUALIFIED PERSONNEL ONLY. TO AVOID
ELECTRIC SHOCK, PERFORM ONLY THOSE SERVICE
PROCEDURES IN THIS INSTRUCTION SHEET.
The 10 Series Service Manual provides the information necessary to service the Fluke
Model 10, Model 11, and Model 12 Multimeters. The following information is provided
in this publication:
• Specifications (Section 1)
• Basic theory of operation (Section 2)
• Disassembly and reassembly (Section 3)
• Performance tests (Section 3)
• Calibration (Section 3)
• Illustrated parts lists and schema tic diagr am (Se ct ion 4)
• Refer to the Users Manual for operating instructions.
WARNING
Introduction and Specifications
Introduction
1
1-2. Specifications
Specifications 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 humid ity to 90 %. AC
conversions are ac-coupled, average respond ing, and calib ra ted to the rms value of a sine
wave input.
Accuracy specifications are given as:
±([% of reading] + number of least significant digits])
1-3
10, 11, 12 Multimeters
Service Manual
Table 1-1. Specifications
Maximum Voltage
Between any Terminal
and Earth Ground
Display 3 3/4-digits, 4000 counts, updates 4/sec
Operating Temperature -10°C to 50°C
Storage Temperature -30°C to 60°C indefinitly (to -40°C for 100 hrs)
Temperature Coefficient 0.1 x (specified accuracy)/°C (<18°C or >28°C)
Relative Humidity 0% to 90% (-10°C to 35°C) 0% to 70% (35°C to 50°C)
Battery Type 9V, NEDA 1604 or IEC 6F22
Battery Life 650 continious hours with alkaline 450 continious hours with carbon-zinc
Shock, Vibration 1 meter shock. Per MIL-T-28800D for a Class 3 Instrument
Size (HxWxL) 1.35 in x 2.75 in x 5.55 in (3.46 cm x 7.05 cm x 14.23 cm)
Weight 10 oz (286 g)
Safety Designed to Protection Class II requirement of UL1244, ANSI/ISA-S82,
EMI Regulations Complies with FCC Part 15, Class B, and VDE 0871B.
Volts AC 4000 mV* 1 mV ±(2.9%+3) ±(1.9%+3)
4.000V 0.001V ±(2.9%+3) ±(1.9%+3)
40.00V 0.01V ±(2.9%+3) ±(1.9%+3)
400.0V 0.1V ±(2.9%+3) ±(1.9%+3)
600V 1V ±(2.9%+3) ±(1.9%+3)
Volts DC 4000 mV 1 mV ±(1.5%+2) ±(0.9%+2)
4.000V 0.001V ±(1.5%+2) ±(0.9%+2)
40.00V 0.01V ±(1.5%+1) ±(0.9%+1)
400.0V 0.1V ±(1.5%+1) ±(0.9%+1)
600V 1V ±(1.5%+1) ±(0.9%+1)
Resistance 400.0Ω 0.1Ω ±(1.5%+2) ±(0.9%+2)
4.000 kΩ 0.001 kΩ ±(1.5%+1) ±(0.9%+1)
40.00 kΩ 0.01 kΩ ±(1.5%+1) ±(0.9%+1)
400.0 kΩ 0.1 kΩ ±(1.5%+1) ±(0.9%+1)
4.000 MΩ 0.001 MΩ ±(1.5%+1) ±(0.9%+1)
40.00 MΩ 0.01 MΩ ±(1.9%+3) ±(1.5%+3)
Capacitance 1.000 µF 0.001 µFNA ±(1.9%+2)
10.00 µF 0.01 µFNA ±(1.9%+2)
100.0 µF0.1 µFNA ±(1.9%+2)
1000 µF1 µFNA±(1.9%+2)
10000 µF 10 µF NA ±(10%+90) Typical
Continuity/Diode
Test
* The 4000 mV range can only be entered in the manual range mode. Use the 4000 mV range with
accessories.
** The beeper is guaranteed to come on at <25Ω and turn off at >250Ω. The meter detects opens or shorts
of 250 µs or longer.
2.000V 0.001V ±(1.5%+2) ±(0.9%+2)
600V ms
CSA C22.2 No 231, and VDE 0411, and IEC 1010 overvoltage category
III.
Accuracy (50 to 400 Hz)Function Range Resolution
Model 10 Models 11/12
1-4
Table 1-1. Specifications (cont)
Introduction and Specifications
Specifications
1
Function Overload
Protection*
Volts DC 600V rms >10 MΩ <100 pF
Volts AC 600V rms >5 MΩ <100 pF kCHEK
Resistance Open Circuit
600V rms <1.5V dc
Diode 600V rms 2, 4-3. 0V dc 2,400V dc 0.95 mA typical
* 3 x 106 V Hz Maximum
** Models 11 and 12 only
MIN MAX Recording with Elapsed Time (Model 12 Only)
Specified accuracy of the measurement function ± 12 digits for changes >200 ms in duration (±40 digits in
ac). Typical 100 ms response to 80%.
Elapsed Time Resolution Accuracy
Input Impedance
(Nominal)
k
CHEK & LoZ = >2 kΩ
<200 pF**
& LoZ = >2 kΩ <200
pF** (ac-coupled)
Test Voltage
Common Mode
Rejection Ratio
(1 kΩ Unbalance)
>100 dB at dc, 50 Hz,
or 60 Hz
>60 db, dc to 60 Hz
Full Scale Voltage To
4.0 MΩ 40 MΩ
<450 mV 1.5V dc <500 uA
dc
Normal Mode
Rejection
>50 dB at 50 Hz
or 60 Hz
Short Circuit
Current
0 to 100 hours 1 minute 0.3% typical
(99:59)
Continuity Capture (Model 12 Only)
Detects opens or shorts of 250 µs or longer.
1-5
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