Fluke 93 User manual

FLUKE AND PHILIPS THE GLOBAL ALLIANCE IN TEST &MEASUREMENT
Fluke 93/95/97
Philips PM93/95/97
SCOPEMETER
Service Manual
Ruker 915970
Philipe: 4622 872 05349
920121
Warning: These servicing instructions are for use by qualified personnel oniy. To reduce the risk
of eiecthc shocks do not perform any servicing other than that specified in the operating
instructions uniess you are fully qualified to do so.
FLUKE

IMPORTANT
In correspondence concerning thie instrument please give the model number and serial number as located on
the type number plate on Ihe Instrument
All moditicallons up to production data 21 january 1992 are Incorperated In this manual.
For your reference:
Model number: PMxx Fluke xx
Code number :9444 yyy yyyyy 9444 yyy yyyyy
Serial number: DM nn mmmm DM nn mmmm
Note: The design of this instrument is subject to continuous development and improvement. Consequently,
this instrument may incorporate minor changes In detail from the infom}ation contained in this manual.
©Copyright Philips Export B.V., 1992
All rights reserved. No part of this publication may be reproduced by any means or In any form without written
permission of the copyright owner.
Printed in The r^eiheriande

CONJTENTS
TABLE OF CONTENTS Page
1. SAFETY INSTRUCTIONS 1-1
1.1 INTRODUCTION M
1.2 SAFETY PRECAUTIONS 1-1
1.3 CAUTION AND WARNING STATEMENfTS 1-1
1.4 SYMBOLS 1-1
1.5 IMPAIRED SAFETY M
1.6 GENERAL SAFETY INFORMATION M
2. CHARACTERISTICS 2-1
2.A PERFORMANCE CHARACTERISTICS 2-1
2.B SAFETY CHARACTERISTICS 2-1
2.1 DISPLAY 2-1
2.2 SIGNAL ACQUISITION 2-1
2.3 CHANNELS A&B 2-2
2.4 TIMEBASE 2-4
2.5 TRIGGER 2-5
2.6 SIGNAL MEMORY (MODELS 95 AND 97 ONLY) 2-6
2.7 TRACE DISPLAY 2-6
2-8 SETUP MEMORY (MODEL 95 ONLY) 2-6
2.9 SETUP MEMORY (MODEL 97 ONLY) 2-7
2.10 CALCULATION FACILITIES (MODEL 95 ONLY) 2-8
2.11 CALCULATION FACILITIES (MODEL 97 ONLY) 2-8
2.12 CURSORS (MODELS 95 AND 97 ONLY) 2-9
2.13 MULTIMETER 2-9
2.14 AUTO SETTING 2-14
2.15 GENERATOR (MODEL 93 AND 95) 2-16
2.16 GENERATOR (MODEL 97 ONLY) 2-16

IV CONTENTS
2.17 POWER ADAPTOR BATTERY CHARGER 2-17
2.18 POWER SUPPLY 2-17
2.19 MECHANICAL 2-18
2.20 ENVIRONMENTAL 2-19
2.21 INTERFACE (MODEL 97 ONLY) 2-21
2.22 SAFETY 2-22
2.23 ACCESSORIES 2-23
2.24 SERVICE AND MAINTENANCE 2-23
3. CIRCUIT DISCRIPTIONS 3-1
3-1 INTRODUCTION TO CIRCUIT DiSCRIPTION 3-1
3.1.1 GENERAL 3-1
3.1.2 LOCATION OF ELECTRICAL PARTS 3-1
3.2 FUNCTIONAL BLOCK DISCRIPTION 3-2
3.2.1 INTRODUCTION 3-2
3.2.2 DATA ACQUISITION 3-4
3.3.3 MICROPROCESSOR 3-7
3.3.4 DIGITAL ASIC (D-ASIC) CIRCUITRY 3-9
3.3.5 LCD CIRCUl'mY 3-12
3.4 ANALOG CIRCUITS (A2) 3-14
3.4.1 INTRODUCTION 3-14
3.4.2 OVERVIEW ANALOG CIRCUITS 3-14
3.4.3 ATTENUATOR SECTIONS, CHANNEL A AND B3-14
3.4.4 EXTERNAL (BANANA) INPUT/OUTPOT CIRCUITRY 3-18
3.4.5 ANALOG ASIC (A-ASIC) AND ADC CIRCUITRY 3-20
3.4.6 ANALOG CONTROL CIRCUIT 3-24
3.4.7 GENERATOR CIRCUIT 3-30
3.4.8 BATTERY CHARGER 3-32
3.4.9 POWER SUPPLY 3-34
4. PERFORMANCE VERFICATION PROCEDURE 4-1
4.1 GENERAL INFORMATION 4-1
4.2 STANDARD PERFORMANCE VERFICATION PROCEDURE 4-2
4.3 STANDARD PERFORMANCE VERFICATION PROCEDURE SUMMARY 4-16
4.4 AODmONAL PERFORMANCE VERFICATION PROCEDURE 4-17

CONTENTS V
5.
CALIBRATION ADJUSTMENT PROCEDURE 5-1
5.1 GENERAL INFORMATION 5-1
5.2 RECOMMENDED CALIBRATION ADJUSTMENT EQUIPMENT 5-1
5.3 ENTERING THE CALIBRATION PROCEDURE 5-2
5.4 OPERATING THE CAUBRATION PROCEDURE 5-3
5.5 CONTRAST CALIBRATION ADJUSTMENT PROCEDURE 5-4
5.6 SCOPE CALIBRATION ADJUSTMENT PROCEDURE 5-4
5.6.1 HARDWARE SCOPE CAUBRATION ADJUSTMENTS 5-4
5.6.2 CLOSED CASE SCOPE CALIBRATION ADJUSTMENTS 5-8
5.7 METER CAUBRATION ADJUSTMENT PROCEDURE 5-15
5.8 CALIBRATION ADJUSTMENT PROCEDURE SUMMARY 5-24
6. DISASSEMBLING THE SCOPEMETER 6-1
6.1
GENERAL INFORMATION 6-1
6.2. DISASSEMBLY PROCEDURE 6-1
6.2.1 REMOVING THE BATTERY PACK 6-2
6.2.2 OPENING THE SCOPEMETER 6-2
6.2.3 REMOVING THE ANALOG A2 PCB. TO ENABLE HARDWARE
SCOPE CAUBRATION ADJUSTMENTS 6-4
6.2.4 REMOVING THE DIGITAL A1 PCB 6-4
7.
CORRECTIVE MAINTENANCE 7-1
7,1 DIAGNOSTIC TESTING AND TROUBLESHOOTING 7-1
7.1.1 INTRODUCTION 7-1
7.1.2 TROUBLESHOOTING TECHNIQUES 7-1
7.1.3 DISPLAY AND ERROR MESSAGES 7-2
7.1.4 MAIN TESTS 7-5
7.1.5 TROUBLESHOOTING 7-7
7.1.6 DIGITAL At PCB TROUBLESHOOTING 7-7
7.1.7 ANALOG A2 PCB TROUBLESHOOTING 7-28
72 REPLACEMB^TS 7-40
7.2.1 STANDARD PARTS 7-40
7.2.2 SPECIAL PARTS 7-40
7.2.3 TRANSISTORS AND INTEGRATED CIRCUITS 7-40
7.2.4 STATIC-SENSITIVE COMPONENTS 7-40
7.2.5 REPLACEMENT OF PARTS 7-42
7.3 SOLDERING TECHNIQUES 7.5I
7-3-1 GENERAL SOLDERING TECHNIQUES 7-51
7.3.2 SOLDERING MICRO-MINIATURE SEMICONDUCTORS 7-51

VI CONTENTS
7
A
SPECIAL TOOLS 7-52
7.4.1
EXTENDER FLAT CABLE 7-52
7.5 RECALIBRATION AFTER REPAIR 7-52
7.6 INSTRUMENT REPACKING 7-52
8. MAINTENANCE OF THE PRIMARY CIRCUIT (PM8907/...) 8-1
9. REPLACEABLE PARTS LIST 9-1
9.1 INTRODUCTION 9-1
9.2 HOW TO OBTAIN PARTS 9-2
10. CIRCUIT DIAGRAMS 10-1

1-2 SAFETY INSTRUCTIONS
1.5 IMPAIRED SAFETY
Whenever HIs likely that safety has been Impaired, the Instrument must be turned off and
disconnected from all external voltage sources, and the batteries must be removed. The matter
should then be referred to qualified technicians. Safety Is likely to be impaired if, for example, the
instrument fails to perform the intended measurements or shows visible damage.
1.6 GENERAL SAFETY INFORMATION
WARNING: Removing the instrument covers or removing parts, except those to which
access can be gained by hand, is likely to expose live parts and accessible
terminals which can be dang^ous to life.
The instrument must be disconnected frorr> all voltage sources and batteries must be removed before
rt is opened.
Capacitors inside the instrument can hold their charge even if the instrument has been separated
from all voltage sources and batteries are removed. Components which are important for the safety
of the Instrument may only be replaced by components obtained through your local FLUKE/PH ILI PS
organization. These components are Indcated by an asterisk (*) In the parts list sechon (chapters).

CHARACTERISTICS 2-1
2CHARACTERISTICS
A. Performance Characteristics
PHILIPS and FLUKE guarantee the properties expressed in numerical values with stated
tolerance. Specified non-tolerance numerical values indicate those that coutd be nomir^lly
expected from the mean of arange of identical instruments.
•For definitions of terms, reference is made to lEC Publicatjon 351-1
.
•The accuracy of all measurements Is within i: {(Si of reading) ±(one least-significant digit)}
from 18C to 28C.
Add 0.1 X(specified accuracy)/C for <16C or >28C ambient.
B. Safety Characteristics
The Instrument has been designed and tested in accordance with IEC Publication 348, Safety
Requirements for Electronic Measuring Apparatus, and has been supplied in asafe condition. This
manual contains Information and warnings that must be followed by the user to ensure safe operation
and to keep the instrument in asafe condition.
2.1 DISPLAY
CHARACTERISTICS SPECIRCATtONS ADDITIONAL INFORMATION
Type LCD
>Useful Screen Area 64 mm x64 mm 1div equals 25 pixels.
1div equals 8.75 mm.
Resolution 240 x240 pixels
•Contrast Ratio Adjustable via LCD Menu.
•Backlight (Model 97 only) Electro Luminescence
2.2 SIGNAL ACQUISITION
•Sampling Type
@1ps/div...60s/dlv
@10 ns/div...500 ns/di
V
Real Time
Quasi Random
•Maximum Sample Rate 25 MS/s Sampling Rate depends on tims/div
setting.
-Maximum Vertical
(voltage) Resolution 6bits Over 10 divisions.
*Maximum Horizontal
(time) Resolution
25 Samples/div Per Channel-
-Record Length
With capture 20 div 512 Samples Per Channel.
With capture 10div 256 Samples Per Channel.

2-2 CHARACTERiSTiCS
CHARACTERISTICS SPECIFICATIONS
-Acquisition Time
(for 20.4 dlv)
60s/dlv...1 ys/Olv
500 ns/div...10 ns/div
«Sources
•Acquisition Modes
20-5 X tlme/div -i- 140 ms
20.5 Xtime/div +120 ms
Channel A
Channel ±B
mV Input
1Channel Only
2Channels
ADDITIONAL INFORMATION
Excluding delay time.
Delay time Is the selected trigger
delay.
Excluding delay time.
In Quasi-Random Mode, the
acquisition time depends on
triggers.
CHAN A, CHAN B
Chopped Mods from
60sydiv...50 ps/div.
Alternating Mode from
20 ps/drv...10 ns/div.
2.3 CHANNELS A&B
*Signal Inputs Isolated BNC Signal Input BNC commons are
connected together.
Common Input
•Input Impedance
Rparallel
Black Safety Banana Jack
1MO± 1%
Part of External Trigger Input.
Frequency dependent, see
Figure 2.1.
For DC coupled input. For AC
coupled input or GND, add 22 nF in
series with Rand Cparallel.
Cparallel 25 pF
MAX. INPUT
IMPEDANCE
Figure 2. 1Max. Iriput Impedance Versus Frequency
rvn

CHARACTERISTICS 2•3
CHARACTERISTICS SPECIFICATIONS ADDITIONAL INFORMATION
•Input Coupling AC DC GND Sequence: ac-doGND (pre-charge
ac), and back to ac.
•Maximum Input Voltage 300 V
(rms)
MAX. PEAK
VOLTAGE
Figure 2.2 Max Input Voltage Versus Frequency
•Defiection Coefftelent
Frequency dependent see fig. 2.2
Between BNC inner and outer
contact. Outer BNC contacts and
Ground (Black) Banana Jack are
internally connected together.
Steps 1mV/dlv...2 mV/div
(Models 95 and 97 only)
Steps 5mV/d(V...100V/div
Error Limit
Overall
Nonlinearity ±(2%±1digit)
±(2% 11cfgit)
Dynamic Range 9.5 div
4div
Position Range
(move control)
-4dlv...+ 4div
Frequency Response
Lower Transition Point
of Bandwidth
Only (or repetitive signals and
llmebase 60s...1mS- if one of the
channels is in this sensitivity, both
channels will be switched to
Average =4.
In a1-2-5 sequence ot 14 positions.
Add 3% tor 1mV and 2mV
per (EC 351 for frequencies
<1MHz.
for frequencies <10 MHz.
for frequencies up to 50 MHz.
Zsource =500.
DC Input Coupling DC
AC Input Coupling -3dB <10Hz < 1Hz including 10 MO probe.
Upper Transition Point >50 MHz (-3 dB)
of Bandwidth Subtract 5MHz for <18 ®C
and >28 Ambient.
Rise time 7ns.