Fluke 93 Manuale utente

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

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

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

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

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

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.

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