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HP 428B Скачать руководство пользователя страница 31

Model 428B

Table 6-1. Replaceable Parts

REFERENCE

DESIGNATOR

-hp-

PART NO.

TQ

DESCRIPTION

MFR.

MFR. PART NO.

A1, A2

A3
Cl
C2
C3 thru Cl0
C11
C12
C13
C14
C15
C16, C17
C18
C19
C20
C21
C22, C23
C24
C25
C26
C27
C28, C29
C30
C31
C32 thru C40
C41
C42
C43 thru C50
C51
C52
C53, C54
C55
C56 thru C60
C61
C62
C63
C64
C65
C66
C67
C68
C69
C70
C71
CR1
CR2
CR3
CR4
CR5
CR6
CR7
CR8
CR9
CR10
CR11, CR12
CR13 thru CR16
CR17
DS1

428B-26A

428B-268

0160-0938
0131-0004

0150-0014
0180-0050
0160-0269
0140-0179
0150-0012
0160-0269
0140-0179
0150-0012

0180-0059

0170-0078
0180-0058
0150-0012
0140-0179
0150-0012

0170-0019

0140-0223
0160-2204

0160-0269
0160-0363
0140-0164
0140-0210

0180-2336
0180-2337
0160-0134

0150 .. 0012

0180-0058
0180-0104

0160-0269
0180·0104
0160-2203
0160-0134
1901-0036

1901-0036

1901-0036

1901·0036

1902-0013
1902-0211
1901-0040
1910-0016
1902-3404
1450-0049

2

1
1
1

1
1
5
3
6

1

1
2

1

1
1

1
2
1

1
1
2

2

1

4

1
1
2
4
1
1

Assembly: resistor ww

A1 includes R3 thru R6
A2 includes R7 thru R 10

Assembly: resistor ww, includes R2, Rll
C: fxd 1000 pF 5%
C: var mica 16-150 pF 175 vdcw
Not assigned
C: fxd cer .005 microfarad 500 vdcw
C: fxd 40 micro75% -10% 50 vdcw
C: fxd cer .1 microfarad 20% 500 vdcw
C: fxd mica 1000 pF 2%
C: fxd cer .01 microfarad 20% 1000 vdcw
C: fxd cer .1 microfarad 20% 500 vdcw
C: fxd mica 1000 p F 2%
C: fxd cer .01 microfarad 20% 1000 vdcw
Not assigned
C: fxd 10 micro 75% -10% 25 vdcw
Not assigned
C: fxd my .47 microfarad 5% 150 vdcw
C: fxd 50 micro75% -10% 25 vdcw
C: fxd cer .01 microfarad 20% 1000 vdcw
C: fxd mica 1000 pF 2%
C: fxd cer .01 microfarad 20% 1000 vdcw
Not assigned
C: fxd my 0.1 microfarad 5% 200 vdcw
Not assigned
C: fxd mica 260 pF 1 %
C: fxd mica 100 pF 5%
Not assigned
C: fxd cer .1 microfarad 20% 500 vdcw
C: fxd mica 620 pF 5%
C: fxd mica 6800 pF 5%
C: fxd mica 270 pF 5%
Not assigned
C: fxd my 20 micro50% -10% 450 vdcw
C: fxd my 20-20 micro50% 10% 450 vdcw
C: fxd mica 220 pF 5%
C: fxd cer .01 microfarad 20% 1000 vdcw
C: fxd 50 micro 75 -10% 25 vdcw
C: fxd 200 micro75% -10% 15 vdcw
Not assigned
C: fxd cer .1 microfarad 20% 500 vdcw
C: fxd 200 micro75% -10% 15 vdcw
C: fxd mica 91 pF 5%
C: fxd mica 220 pF 5%
Diode: si 1000 piv
Not assigned
Diode: si 1000 piv
Not assigned
Diode: si 1000 piv
Not assigned
Diode: si 1000 piv
Not assigned
Diode: breakdown 6.81 V 10%
Diode: breakdown 12.1 V 10%
Diode:  si 30 wiv 50 mA 2 pF 2ns
Diode:  germanium 60 wiv 1 microsecond Trr
Diode:  breakdown 82.5 V 5%
Light Indicator: clear

-hp

-hp
14655
72136

04222
56289
56289
14655
56289
56289
14655
56289

56289

84411
56289
56289
14655
56289

56289

14655
72136

56289
72136
14655
00853

56289
56289
14655
56289
56289
56289

56289
56289
14655
14655
04713

04713

04713

04713

04713
04713
01295
08257
04713
72765

RDM15E102J1C

obd

T51410-9

D1-4

obd

30D406G050DD2-DS
41C9285-CDH
RDM19F102G3C

obd

29C214A3-CDH
41C9285-CDH
RDM19F102G3C

obd

29C214A3-CDH

30D106G025882-DSM

663UW
30D506G025CC2-DSM
29C214A3-CDH
RDM19Fl02G3C

obd

29C214A3-CDH

192P10452-PTS

RDM15F261F3C

obd

RDM15F101J3C

obd

41C92B5-CDH
RDM15F621 J3C

obd

RDM30F682J5S

obd

RDM15F271 J3C

obd

68010168
68D20060
RDM15F221J3C

obd

29C214A3-CDH
30D506G025CC2-DSM
30D207G015DF2-DSM

41C92B5-CDH
30D207G015DF2-DSM
RDM15F910J3C

obd

RDM15F221 J3C

obd

SR1358-12

SR1358-12

SR1358-12

SR1358-12

SZ1521-7
SZ1521-79
PG512
obd
SZ10939-446
599-125( clear)

24

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Содержание 428B

Страница 1: ...ont cover OCR errors may exist and as such the user of this document should take care and use common sense when referencing this documentation Copyright Notice This documentation is copyrighted by Hewlett Packard and Jack Hudler hpdocs hudler org Permission to use and redistribute this documentation for non commercial and internal corporate purposes is hereby granted free of charge Any redistribut...

Страница 2: ...Page intentionally left blank ...

Страница 3: ......

Страница 4: ......

Страница 5: ... 428B CLIP ON DC MILLIAMMETER Serials Prefixed 995 and above Appendix A Manual Backdating Changes adapts this manual to instruments with earlier serial prefixes Copyright Hewlett Packard Company 1970 P O Box 301 Loveland Colorado 80537 U S A Printed NOV 1970 ...

Страница 6: ...5 27 POWER SUPPLY 16 5 29 MECHANICAL ZERO SET 16 5 31 DC AMPLIFIER BALANCE 16 5 34 ALIGNMENT 17 5 35 OSCILLATOR BALANCE 17 5 37 OSCILLATOR FREQUENCY 17 5 39 OSCILLATOR LEVEL 17 5 41 DETECTOR GATE 17 5 43 TUNED AMPLIFIER 17 5 44 Equipment Setup 17 5 46 Input Alignment 17 5 48 Interstage Alignment 17 5 50 DETECTOR PHASE ADJUSTMENT 17 5 53 Preliminary Adjustment 18 5 54 Preset the controls as follows...

Страница 7: ... Electrical Zero Set 14 Figure 5 3 Range Check 15 Figure 5 4 AC Overload 16 Figure 5 5 Oscillator Balance Probe 17 Figure 5 6 Detector Phase Adjustment 17 Figure 5 7 Detector Phase Display 18 Figure 5 9 Detailed Troubleshooting Tree 20 Figure 6 1 Parts Breakdown current probe 28 Figure 7 1 Block Diagram 30 Figure 7 2 Component Locator For Circuit Board Part No 00428 66501 31 Figure 7 3 Front Panel...

Страница 8: ... mA Range 5 mV rms across 1 kΩ 10 mA thru 10 A Ranges 2 mV rms across 1 kΩ Frequency Range DC to 400 Hz 3 dB point AC Rejection Signals above 5 Hz with peak value less than full scale affect meter accuracy less than 2 Except at 40 kHz carrier frequency and its harmonics On the 10 A range ac peak value is limited to 4 A Probe Insulation 300 V Max AC Power 115 or 230 V 10 50 to 60 Hz 71 W Operating ...

Страница 9: ...lip On DC Milliammeter Write to the nearest Sales and Service Office listed in Appendix C for further information At the time of publication of this manual the following accessory probe heads were available a hp Model 3528A Large Aperture 2 1 2 inch probe head b hp Model 3529A Magnetometer 1 gauss 1 amp c hp Model C11 3529A Magnetometer 1 gauss 1 mA 1 6 Write to the nearest Sales and Service Offic...

Страница 10: ...12 To operate from a 230 volt source the 115 230 switch on the rear apron must be flipped to 230 First turn the instrument off and pull the power cable from the socket Place a pointed tool such as the sharpened end of a pencil in the slot of the switch and pull down Replace the fuse with the one given in Table 6 1 for 230 volt operation 2 13 THREE CONDUCTOR POWER CABLE 2 14 The three conductor pow...

Страница 11: ...Model 428B Figure 3 1 Measurement Procedures 4 ...

Страница 12: ...edance 3 9 The probe will add a small inductance to the circuit of less than 0 5 microhenries due to the magnetic core and magnetic shield This makes it ideal for measuring current in very low impedance paths such as ground loops where other instruments would disturb the circuit 3 10 Induced Voltage 3 11 The gating signal driving the core in and out of saturation will induce a voltage in the wire ...

Страница 13: ...body An internal spring returns the jaws to their proper position when the flanges are released See Paragraph 3 3e 3 29 DEGAUSSING OF PROBE HEAD 3 30 To demagnetize the probe proceed as follows a Insert probe into degausser at the rear of the instrument located on front panel of rackmount models with arrow on probe in same position as arrow marked on chassis b Depress degausser switch S3 to energi...

Страница 14: ...d three times through the jaws such that the two currents oppose each other It should be remembered when making such a measurement that the absolute value of any deviations observed have been multiplied If in the above example the 0 6 A supply wavered by 01 A the change would be read as 02 A on the meter 3 46 USE OF OUTPUT JACK 3 47 The OUTPUT jack enables the 428B to be used as a dc coupled ampli...

Страница 15: ...Model 428B Figure 4 1 Block Diagram 8 ...

Страница 16: ...oportional to and magnetically almost equal to the dc current of the inserted wire is used to indicate the measured dc current 4 7 The 20 kHz oscillator has two functions First it supplies a 20 kHz signal for driving the probe head and also provides a 40 kHz second harmonic signal for gating the 40 kHz Synchronous Detector 4 8 Due to slight unbalances the probe head output contains a small 40 kHz ...

Страница 17: ...re of the current probe Figure 4 4 Basic Flux Gate 4 16 The 428B probe head is actually analogous to the flux gate shown in Figure 4 5 The energizing dc current produces flux path A Flux path A is periodically interrupted by saturation of the transformer type core a result of the two flux paths C Note that the current enters L3 and L4 from the same end and that the coils are wound in opposite dire...

Страница 18: ...level 40 kHz signal The 40 kHz output signal of the oscillator V7 passes through a tuned circuit and drives the gate amplifier V5 The output of V5 delivers a 40 kHz gate signal to the Synchronous Detector 4 28 40 kHz INPUT AMPLIFIER CIRCUIT 4 29 The 40 kHz output voltage of the probe head is resonated by a 40 kHz series resonant circuit L5 and C1 C2 Resistor R1 broadens the resonance response by l...

Страница 19: ...plete the local feedback loop of the DC Amplifier This circuit makes the output current of the DC Amplifier proportional to the voltage applied to the input grid pin 7 of V6 4 43 NEGATIVE FEEDBACK CURRENT CIRCUIT 4 44 The negative feedback current path is shown in Figure 4 8 Current divider S1 A divides the feedback current in proportion to the dc current being measured For a dc input of 10 A appr...

Страница 20: ...Resistor 50 Ohms 1 Frequency Response AC Overload hp Part No 0698 3128 0698 8155 DC Voltmeter 25 at 730 mV Output Calibration hp Model 3430A 3469B DC Digital Voltmeter AC Voltmeter Resolves 2 mV Battery operated Noise Check hp Model 4038 AC Portable Voltmeter Resistor 1 kilohm 1 Output Calibration Noise Check hp Part No 11034 82601 Volt Ohmmeter Input impedance 1 megohm Troubleshooting hp Model 42...

Страница 21: ... probe shows excessive sensitivity to the magnetic fields around it the probe jaws should be cleaned to determine excessive sensitivity see Paragraph 5 24 Step a Excessive sensitivity to external fields can be caused by foreign material between the probe jaws or by overheating see Paragraph 3 3 Step d The probe jaws should always be cleaned prior to calibration adjustment or repair of the 428B 5 9...

Страница 22: ...he meter calibrator to the 10 mA range and adjust for 10 mA of output Connect a long thin test lead to the output terminals of the meter calibrator and loop the lead ten times through the jaws of the 428B probe Read 100 mA 3 mA on the 428B Remove the test lead from the jaws of the probe one loop at a time and check the linearity of the readings Each reading should be within 3 mA of nominal e g 90 ...

Страница 23: ...rom 10 mA to 10 amps using the procedure of Step f No ac output reading should exceed 2 mV 5 25 ADJUSTMENT PROCEDURE 5 26 When the instrument shows signs of defective components use the troubleshooting procedure to find and correct the problem It is quite easy to compound a 428B trouble by misaligning the instrument in an attempt to adjust out the effects of a defective component 5 27 POWER SUPPLY...

Страница 24: ... be generated by a filament transformer as in Figure 5 6 or by an oscillator operating into its rated load as in Paragraph 5 20 Set the 428B RANGE switch to 100 mA This arrangement will be used for input interstage and detector phase adjustments Figure 5 6 Detector Phase Adjustment 5 46 Input Alignment 5 47 Short TP1 and TP2 to ground open the feedback disconnect shown in Figure 7 3 then adjust C2...

Страница 25: ...nt probe set R98 for a minimum ac reading at Test Point 3 Pin 7 of V2 The minimum reading should be less than 0 5 volt 5 57 Residual 40 kHz Cancellation 5 58 The residual output of the probe head is cancelled by means of the circuit discussed under Paragraph 4 45 This procedure assumes that the preliminary adjustments listed in Paragraph 5 54 have been completed a Reconnect the feedback disconnect...

Страница 26: ...arly identical and in the area of approximately 4 1 2 to 5 ohms Where a resistance measurement between any of the above pairs of pins is significantly higher than between the other pairs by about 3 times an open probe coil is indicated Any open circuit indicates a broken conductor between the plug and the bridge The broken conductor is probably a broken wire in the cable Either condition could ind...

Страница 27: ...Model 428B Figure 5 9 Detailed Troubleshooting Tree 20 ...

Страница 28: ...se checks except an oscilloscope and a wire to ground TP1 and TP2 5 80 Synchronous Detector 5 81 With TP1 and TP2 still grounded and on the 100 mA range perform the test indicated Beyond a tedious ohmmeter test of the circuitry between T3 and pin 7 of V6 little can be done to check the detector circuit It should be noted however that R46 should be able to provide the 0 5 Vdc which is required at p...

Страница 29: ...Model 428B 22 ...

Страница 30: ...nsistor conn connection mA milliampere s 10 3 amperes farads V volt s dep deposited MHz megahertz 10 6 hertz piv peak inverse voltage vacw alternating current DPDT double pole double throw MΩ megohm s 10 6 ohms p o part of working voltage DPST double pole single throw metflm metalfilm pos position s var variable elect electrolytic mfr manufacturer poly polystyrene vdcw DC working voltage encap enc...

Страница 31: ...er 01 microfarad 20 1000 vdcw Not assigned C fxd my 0 1 microfarad 5 200 vdcw Not assigned C fxd mica 260 pF 1 C fxd mica 100 pF 5 Not assigned C fxd cer 1 microfarad 20 500 vdcw C fxd mica 620 pF 5 C fxd mica 6800 pF 5 C fxd mica 270 pF 5 Not assigned C fxd my 20 microfarads 50 10 450 vdcw C fxd my 20 20 microfarads 50 10 450 vdcw C fxd mica 220 pF 5 C fxd cer 01 microfarad 20 1000 vdcw C fxd 50 ...

Страница 32: ... 681 1 1 8 W R fxd flm 2 26 kilohms 1 1 8 W R fxd flm 6 98 kilohms 1 1 8 W R fxd flm 24 9 kilohms 1 1 8 W R fxd flm 66 5 kilohms 1 1 8 W R fxd comp 130 kilohms 5 1 4 W R fxd comp 43 megohms 5 1 2 W Not assigned R fxd comp 1000 ohms 10 1 4 W R fxd comp 1 megohm 10 1 4 W R fxd comp 10 kilohms 10 1 2 W R fxd comp 150 kilohms 10 1 4 W R fxd camp 750 ohms 5 1 4 W R fxd comp 150 kilohms 10 1 4 W R fxd c...

Страница 33: ... ohms ww Not assigned R var 2 kilohms 20 ww 1 5 W R fxd comp 5 6 kilohms 10 1 4 W R fxd comp 15 kilohms 10 1 4 W Not assigned R fxd flm 32 4 kilohms 1 1 2 W R var comp 50 kilohms 30 R fxd comp 100 ohms 10 1 4 W R Fxd comp 1000 ohms 10 1 4 W R Fxd comp 470 ohms 10 1 4 W R Fxd comp 100 ohms 10 1 4 W R var 300 ohms 20 ww 1 5 W R fxd 15 kilohms 5 2 W R fxd comp 100 kiloh ms 10 1 W R fxd prec 169 ohms ...

Страница 34: ... 12B4A miniature 9 pin Tube electron 6AU6 miniature 7 pin Cable AC power MISCELLANEOUS Dust Cover rack only Probe Assembly see Figure 6 1 Escutcheon Panel cabinet only Panel rack only Assembly cabinet Bumper rubber Handle leather Bail cabinet tilt Detent cabinet bail Assembly P C Board Bezel Board P C Boot rack only Brush nylon Bushing potentiometer Fuse clip Fuse holder Heat sink Knob round brown...

Страница 35: ...Model 428B Figure 6 1 Parts Breakdown current probe 28 ...

Страница 36: ...tionship between 7 7 COMPONENT LOCATION DIAGRAMS the assemblies of the instrument Signal flow between 7 8 The component location diagrams show the assemblies and significant portions of assemblies as well physical location of parts mounted on an assembly as major feedback paths are shown The block diagram Each part is identified by a reference designator is used to develop an understanding of the ...

Страница 37: ...Model 428B Figure 7 1 Block Diagram 30 ...

Страница 38: ...Model 428B Figure 7 2 Component Locator For Circuit Board Part No 00428 66501 Figure 7 3 Front Panel Component Locator Figure 7 4 Rear Panel Component Locator 31 ...

Страница 39: ...Model 428B Figure 7 5 Power Supply 32 ...

Страница 40: ...Model 428B Figure 7 6 Block Diagram 33 ...

Страница 41: ...Model 428B Figure 7 7 Component Locator for Circuit Board Part No 00428 66501 Figure 7 8 Front Panel Component Locator Figure 7 9 Rear Panel Component Locator 34 ...

Страница 42: ...Model 428B Figure 7 10 Metering Circuit Note This schematic has been chopped and resectioned to reduce the 11x30 page to better fit on 8 x11 paper 35 ...

Страница 43: ...which appear in this Appendix make A 2 Schematic diagrams photographs and a parts this manual applicable to those 428B Clip on DC list for the earlier instruments have been included in Milliammeters which bear serial number prefixes of this Appendix 601 or below 36 ...

Страница 44: ...Model 428B Figure A 1 428B Side Views 37 ...

Страница 45: ...Model 428B Figure A 2 Backdating Schematics for 428B 38 ...

Страница 46: ...Model 428B Figure A 3 Backdating Schematics for 428B 39 ...

Страница 47: ... L7 L8 9140 0049 9110 0025 Inductor var 16 mh Inductor degaussing C24 0170 0078 fxd my 0 47 uf 5 150 vdcw Ml 1120 0116 Meter 0 5 ma 6 10 ohms C25 0180 0058 fxd elect 50 of 10 100 25 vdcw P1 1251 0090 Connector male 4 pin C26 0150 0012 fxd cer 10K pf 20 1000 vdcw P2 8120 0050 Cable power C27 0140 0099 fxd mica 1K pf 1 500 vdcw Q1 1854 0039 Transistor Si NPN 2N3053 C28 29 0150 0012 fxd cer 10K pf 20...

Страница 48: ...6K ohms 10 1 2 W R38 thru R40 R41 thru R44 0727 0184 Not Assigned fxd dep c 28 4K ohms 1 1 2 W R86 R87 thru R90 0687 1531 fxd comp 15K ohms 10 1 2 W Not Assigned R45 0727 0244 fxd dep c 500K ohms 1 1 2 W R91 0727 0195 fxd dep c 50K ohms 1 1 2 W R46 2100 0006 var ww 5K ohms 10 2 W R92 2100 0013 var comp lin 50K ohms 20 R47 0689 3935 fxd comp 39K ohms 5 1 W R93 0687 1011 fxd comp 100 ohms 10 1 2 W R...

Страница 49: ...pin miniat T5 9120 0051 Transformer osc 1400 0008 Fuseholder T6 428A 60D Transformer head drive 1400 0084 Fuseholder T7 9100 0104 Transformer power 1450 0020 Jewel pilot light V1 2 1923 0017 Tube electron 6AH6 8520 0017 Electric shaver brush V3 4 1930 0013 Tube electron 6AL5 1205 0011 Heat dissipater semiconductor V5 1923 0017 Tube electron 6AH6 V6 7 1932 0022 Tube electron 6DJ8 ECC88 V8 1932 0029...

Страница 50: ...tage at this point should be 272 6 V if not adjust R 109 for 272 V b Measure 12 1 V dc between the cathode of CR 10 and ground c Measure 7 1 V dc between the anode of CR9 and ground Page 5 3 Paragraph 5 32 Change C10 to L10 Change C14 to C18 The 6 3 V filament supply is available at pin 4 or 5 of V6 Page 5 3 Paragraph 5 32 Replace entire paragraph with the following 5 32 Disconnect FEEDBACK DISCON...

Страница 51: ...ack only 00428 64401 Assembly cabinet 5020 6849 Bezel Page 6 6 Fig 6 1 Change Part No of Coil Spring by probe nose section to 1460 0600 and change PIN of Cable Clamp by connector plug to 00428 41201 Page 7 1 Note that resistors are in ohms and capacitors are in pF unless otherwise marked and that selected starred components marked wit an asterisk may not even be present Page 7 3 figure 7 5 TP5 is ...

Страница 52: ...Model 428B 00428 90003 PRINTED IN U S A 45 ...

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