Philips PM 6303A User manual

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PM 6303A CONTENTS 0
-1
CONTENTS
1 SAFETY INSTRUCTIONS 1 - 1
1.1
SAFETY PRECAUTIONS 1- 1
1.2 CAUTION AND WARNING STATEMENTS 1- 1
1.3 SYMBOLS 1- 1
1.4 IMPAIRED SAFETY PROTECTION 1- 1
1.5 GENERALCLAUSES 1- 1
2 MAINS VOLTAGE SETTING AND FUSES
2-1
3 OPERATING AND MEASUREMENT PRINCIPLE,
BLOCK DIAGRAM, Figs. 1 to 5 3 - 1
3.1 DESCRIPTION OF THE BLOCK DIAGRAM. Fig. 3
3-1
3.2 MEASUREMENT PRINCIPLE
3-2
4 CIRCUIT DESCRIPTION, FAULT FINDING, Figs. 6 to 10
4-1
4.1 POWER SUPPLY. Fig. 52
4-1
4.2 CRYSTALCLOC
K, FREQ. DIVIDER. PHASE SELECTOR; Fig. 58
4-1
4 .3 COMPONENT CONNECTION. BUFFER. Rg . 56
4-2
4.4 CURRENTTO VOLTAGE CONVERTER. Fig. 56
4-2
4.5 PROGRAMMABLE AMPLIFIER. BAND-PASS FILTER 2. Rg . 56 4 - 3
4
.6 LEVEL DETECTOR. Fig . fiT
4 - 3
4
.7 PHASE SENSITIVE RECTIFIER. Fig. 57
4-3
4.8 ANAlOG TO DIGITAL CONVERTER. ADC. Rg . 57
4-4
4.9 CENTRAL PROCESSING UNIT. CPU. Fig. 58 4-6
4.10 KEYBOARD I DISPLAY. UNIT 2. Fig. 60 4-6
5 PERFORMANCE TEST 5 - 1
5.1 INTRODUCTION
5- 1
5.2 RECOMMENDED TEST EQUIPMENT 5 - 1
5.3 SELFTEST ROUTINE 5 - 1
5.4 PERFORMANCE VERIFICATION
5-2
6 TEST PROGRAM, Figs. 11, 12
6-1
7 DISASSEMBLING THE INSTRUMENT 7 - 1
7.1 GENERAL INFORMATION
7-1
7.2 REMOVING THE COVERS
7-1
7.3 UNIT 1
7-2
7.4 UNIT 2
7-2
7.5 UNIT 3 7
-2
7.6 TEXT PLATE 7
-2
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0-2
CONTENTS PM 6303A
8 CHECKING AND ADJUSTING
8-1
8.1 GENERAL INFORMATION
8-1
8.2 RECOMMENDED TEST EQUIPMENT 8-1
8.3 ADJUSTING PROCEDURE 8-2
9 SAFETY INSPECTION AND TESTS AFTER REPAIR AND
MAINTENANCE IN THE PRIMARY CIRCUIT
9-1
9.1 GENERAL DIRECTIVES 9-1
9.2 SAFETY COMPONENTS 9-1
9,3 CHECKING THE PROTECTIVE EARTH CONNECTION
9-1
9.4 CHECKING THE INSULATING RESISTANCE
9-1
10 SPARE PARTS,
Figs. 30 to 32
10- 1
10.1 GENERAL
10-1
10 .2 STANDARD PARTS
10- 1
10.3 SPECIAL PARTS
10- 1
10.4 TRANSISTORS AND INTEGRATED CIRCUITS
10- 1
10.5 STATIC SENSITIVE COMPONENTS
10- 2
10.6 HANDLING MOS DEVICES
10- 2
10 .7 SOLDERING TECHNIQUES
10- 3
10.8 MECHANICAL PARTS, HOUSING (Fig. 30)
10- 5
10.9 MAINS CABLES
10- 5
10. 10
MECHANICAL PARTS ON UNITS, CABLES,
10-7
PARTS NOT ON UNITS, MISCELLANEOUS (Fig. 31)
10 . 11
ACCESSORIES, ADAPTERS (Fig. 32)
10-7
10 .12 ELECTRICAL PARTS ON UNITS
10- 8
11
FIGURES
Fig. 51
Overall circuit diagram
Fig. 52
Unit 1, Power supply
Fig. 53
Un it 3, Flex print
Fig, 54
Unit 3, Flex print ; component la y ~ut
Fig. 55
Unit " Component lay--out
Fig. 56
Unit 1. Input circuit and amplifiers
Fig. 57
Unit 1, Analog to digital converter
Fig. 58
Unit 1, Frequency generation , CPU, counter
Fig. 59
Unit 2, Keyboard, display ; component lay-out
Fig. 60
Unit 2, Keyboard, display
Fig. 61
Accessories PM 9541 A, PM 9542A
12 ADDRESSES FOR
SALES AND SERVICE
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PM 6303A
SAFETY INSTRUCTIONS 1- 1
1 SAFETY INSTRUCTIONS
WARNING: These servicing instructionsareforuse by qualified personnel only. To reducethe
risk 01 efectric shock, do notperform any servicing otherthan that specified in the
Operating Instructions unless you are fully qualified to do so.
Read these pages carefully before Installation and use of the instrument.
The following dauses contain information. cautions and warnings which must be followed to ensure
safe operation and to retainthe Instrument
In asafe condlUon .Adjustment, maintenanceandrepair to
the instrument shall be carried out only
by qualified personnel.
1.1 SAFETY PRECAUTIONS
Forthecorrect and safeuseofthis inslrumenlit Is essentialthatboth operatingandseMcingpersonnel
tollowgenerally-accepted safetyprocedures inadditiontothe safety precautions specified In this man-
ual. Specific warning and caution statements, where they apply, will be found throughout the manual.
Where necessary, the wamlng and caution statements and/or symbols are
mar14:ed on the apparatus.
1.2 CAUTION AND WARNING STATEMENTS
CAUTION: Is used to Indicate correct operating or maintenance procedures in order to prevent
damage to or destruction of the equipment or other property.
WARN ING: Calls attention to a potential dangerthat requires correctprocedures or practices
in order to prevent personal injury.
1.3 SYMBOLS Protective earth (black symbol
on yellow background)
(grounding) terminal
1.4 IMPAIRED SAFETY PROTECTION
Whenever it is likely that safety protection has been Impaired, the Instrument must be made Inopera-
tive and be secured against any unintendedoperation.The mattershould then be referred to qualHfed
technicians.Safety protection is likelyto beImpaired if ,forexample,theInstrumentfails to perform the
Intended measurements or shows visible damage.
1.5 GENERAL CLAUSES
WARNING: The opening of covers orremoval of parts, except those to which access can be
gaines by hand, is likely to expose live parts and accessible terminals which can
be dangerous to live.
The Instrument shall be disconnected from all voltage sources before It Is opened.
Bearinmindthatcapacitorsinsidethe instrument can holdtheirchargeeven iftheinstrumenthas been
separated from all voltage sources.
WARNING: Any interruption of theprotectiveearth conductorInsideoroutsidetheInstrument,
or disconnection of the protective earth terminal,is likely to make the Instrument
dangerous. Intentional Interruption
Is prohibited.
Componentswhich are importantforthesafetyofthe instrumentmay only
be renewed by oomponents
obtained through yourlocal Philips organlzation (see also chapter 1 0) .
Afterrepairand maintenance in the primary circuit,safety inspectionand tests, as mentioned In chap-
ter
9, have to be performed.
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PM 6303A MAINS VOLTAGE SETTING AND FUSES 2
-1
2 MAINS VOLTAGE SETTING AND FUSES
The safety Instructions In previous chapters must be followed.
Before Inserting the mains plug
Into the mains socket, make sure that the instrumentis set to the local
mains voH:age.
WARNING: If the mains plug has to be adapted to the local sttuation,
such adapUon should be done by a qualified person onty.
On delivery from the factory the Instrument is set to one of the following mains voltages:
Type Coda no. Mains
Delivered
voltage mainscable
PM 6303A 945206303101 220 V Europe, Schuko
PM 6303A
945206303103 120 V North America
PM 6303A
945206303104
240 V England (U.K.)
PM6303A 9452 063 03105
220 V Switzerland
PM 6303A 9452 063 03106
240 V Australia
The set mains vohage and the corresponding fU58 are indicated on the rear panel.
Make surethatonlyfuses ofthe requiredcurrent rating,andofthespecified type,areusedforrenewal.
The use of repaired fuses and/orthe short drcutting of fuse holders are prohibited. The fuseshall be
renewed only by a qualtfied person who Is aware of the hazard Involved.
WARNING: The Instrument shall be disconnected from all vottage
sources when 8 fuse
Is to be replaced or when the
Instrument Is to
be adapted to a different mains vottage.
The Instrument can be
set to the followtng mains voh.ages: 100 V, 120 V, 220 V and 240 V a.c. These
nom inal voltagescan beselected by meansofthe voltage selector, located at the rear panel, adjacent
to
the mainssocket. The fuse is located In a holderat the same place. For mains vohageselection or
replacement of the fuse remove the mains cable and pry
open the compartment with a small
sO'ewdriver (see drawing
).
Select one of the vohage range s, as appropriate, by turning the selector. If necessary, insertthe ad ·
vised fuse (T0.
1A or TO . 2A ) into the fuse holderInstead of the one bulb·ln.
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PM 6303A OPERATING AND MEASUREMENT PRINCIPLE
3 OPERATING AND MEASUREMENT PRINCIPLE,
BLOCK DIAGRAM, Figs. 1 to 5
3.1 DESCRIPTION OF THE BLOCK DIAGRAM, Fig. 3
3-1
The 16 MHz crystal clock generates the basicfrequency for all signals, so the count pulses for the
analog
to digital converter ADe .
The frequency divider generates the 8 MHz clock pulse for the microprocessorand the 1 kHz mea-
surement frequency In 3 reference phases 0·. 90-. or 180· for the phase sensitive rectifier and the
ADC.
The band~pass filter 1 converts the TTL signal Into a 1 kHz sinewave signal.
The test yoltage amplifier amplifies the 1 kHz sinewavs signal to a 2 V open-circuit voltage at the
component connection. In the DC BIAS mode 2 V DC are added to the 1 kHz signal.
The isolating
buffer senses the voltage at the component.
The current to voltage converter converts the current through the component Into a proportional
voltage. The conversion factor (gain) can be switched by 8 factor 10.
For voltage or current measurement the input of the subsequent differential amplifier is switched
over by the voltage / current (VII) selector controlled by the CPU.
In the
programmable amplifier gainfactors x 0.1, x " orx 10areselected by the CPU depending on
the impedance
of the component. For reference measurement the Input is short-circuited.
The 1 kHz band-pass filler 2suppresses hum interlerenceand reducesthe harmoniccontents onthe
1
kHz measurement signal.
The level detector compares theoutput voltage of band-pass filter 2 wtth a presetreference value. If
this value is exceeded, the CPU swHches the programmable ampUllar to a lower galn factor.
The
phase sensitive rectifier generates DC voltages whichareproportional to thatcomponentofthe
measurement voltage being in-phase with the reference voltage.
The analog to dlgl1al convener ADC converts the output Signal of the rectifierInlo a binary number
which can be processed
by the CPU.
The central processing unit CPU with the miaoprooessor controls andmonltoresthe measurement
processaccordingtothekeyboard setting.computatesandstores the measurementvalues andtrans-
fers the result to the display. It also comprises the non-volatile memory forthe keyboard settingsand
the TRIM data .
On unit2 you find thebacklit liquid crystal display LCD wHh 2 backplanes controlled In duplex mode
by the decoder/driver.
Overmore on unit 2 you find the keyboard with Its assigned encoder .
The
power supply generates the required stabilized devoltages +15 V, -15 V, +5 V, and -5 V forthe
circuitries. It also comprises the power-down circuit for the non-volatile memory .
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3-2
OPERATING AND MEASUREMENT PRINCIPLE PM 6303A
3.2 MEASUREMENT PRINCIPLE
The component measurement Is based on the so-called current and vottage technique.The compo-
nent vohage and after that the component current ara measured and converted into binary values.
From these values the CPU calculates the ektdrica! parameters at the component. According to the
front panel parameter selection, etther the dominant component Is automatically displayed
(AUTO) -resistance. capadtance or inductance-or the sektcted parameter Is displayed.
Each measurementcycle lasts approx.0.5
S8oonds . It comprises 5singkl measurements, the results
of which are stored and arithmetically evaluated. Anal!y they are transferred to the display, S98 fig.2.
The 5 single measurements are as follows:
1. Reference measurement.
Althabeginningofeach measurementcycleareferencemeasurement Is performed, withtheoutputof
the programmable amplifiergrounded, caused by low
Signals PAl, PA2 at pins 1, 2 of the micro-pro-
cessor 0315 . The programmable amplifier is setto gain xO . 1. Afteradelaytime of50 msforeach ofthe
single measurements, necessaryforsettlingofthezero contr~ andband-passfltter2,Bmeasurement
without 1kHz signal
Is performed, comprehending all failures within the signal path from multiplexer
0103to the
AJO converter.Thecountercontents oftheAID conversion atthe end ofthis measurement
serves as reference for the subsequent 4 measurements.
2.
O· voltage measurement:
The voltage at the component
is measured.
The switchi
ng phase of the phase sensitive rectifler Is 0· .
For voltage sensing at thecomponentthe Inputs of the differential ampltfter are connected via the VII
selector.multiplexer 0101 ,to themeasurement Input.This is achleved by kM signal VIS from the m~
croprocessor 0315.3.The O· switchingphase is acttvated by low slgnal'sMct 4t', 0315. 14 .Thegain
ofthe progranmatNeampttfierls set to
xO .1.Atter5mssettlingtimeforthe 1kHzsignaltheoutputofthe
level detectorls sensed,OVR 0315.12. tf nooverrange Is detected, thegain Is set to xl; the level de-
tectorlssensed again. tf nowoverrangeis detected,the gain Is set backtoxO.l and an AJO conversion
Is started, 0315.5. For low-ohmic components the maximum gain xl0 Is set and, if no overrange Is
detected, the measurement Is performed.
3.
90· vottage measurement:
The voltage at the component
Is measured.
The switching phase of the phase sensitive rectifler
Is 90· .
The gain of the programmable amplifktr is not shered with respect to the O· v~tage measurement.
An AJO oonverslon is performed.
4. o· current measurement:
The current through the component is measured.
The inputsofthedifferential ampUfMK' are swttchedovertotheouputofthecurrentto vottage converter.
The switching phase of the phase sensitive rectifter Is 0· .
The gain of theprogrammable ampntieris set to x. l and, as forvoltage measurement. Increased to xl
with regard to the level detector. Next, if necessary, the conversion coeffk::ient ofthe IN converter is
increasedfrom xl to xl 0(highat0315. 4) andthe gatn ofthe prog . ampUfler Is Inc::reased to xl 0andevt.
set back to
xl after overrange detection. An AID conversion Is performed.
For low-ohmlc components the sequence Is slightly different:
Iffor vottage measurementthe gain
was setto xl or xl 0, theImpedance Is In any case very low, result-
ing in maximum current to flow. The current measurement Is perfonned at gain xO .l without trial for
gain changing.
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