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Hewlett Packard 427A Analog multimeter
Manufacturer:
Model:
427A
Date:
1969
Class:
Type:
SubType:
Voltmeter

Information

The Hewlett-Packard Model 427A is a versatile, compact, self-contained voltmeter. It is capable of making de measurements from 1 mV to 1000 volts, ac measurements from 0. 3 mV to 300 volts at frequencies from 10 Hz to 1 MHz, and resistance measurements from 0.2 ohms to 500 megohms. With the 01 option, the Model 427A may be powered either by a 115 or 230 volt line or by an internal 22-1/2 volt dry cell battery. 1-3, The use of solid state components throughout gives the Model 427A both ruggedness and reliability. Battery operation makes the instrument ideal for field use or isolation from common mode ground loops.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
38
Size:
1.80 Mbytes (1882537 Bytes)
Language:
english
Revision:
Manual-ID:
00427-90004
Date:
01 January 1970
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
30 December 2017
MD5:
ca34523325e050d250723e6c4205964f
Downloads:
168
Service and User Manual
Manual type:
Service and User Manual
Pages:
48
Size:
5.33 Mbytes (5592037 Bytes)
Language:
english
Revision:
Manual-ID:
00427-90004
Date:
01 January 1970
Quality:
Scanned document, all readable.
Upload date:
31 May 2020
MD5:
a742829cdc77d91f0ca17d5f3a23d2ce
Downloads:
19

Information

Serials Prefixed: 947- Appendix C, Manual Backdating Changes, adapts manual to serials prefixed 5 50-, 621-, 731- Section Page I GENERAL INFORMATION ... 1-1 1-1. Description ... 1-1 1-5. Battery ... 1-1 1-7. Instrument and Manual Identification ... 1-1 1-10. Available Accessories ... 1-1 1-12. Cables and Adapters ... 1-1 1-13. Probes ... 1-1 Section Page II INSTALLATION ... 2-1 2-1. Introduction ... 2-1 2-3. Initial Inspection ... 2-1 2-5. Power Requirements ... 2-1 2-7. Grounding Requirements ... 2-1 2-10. Installation ... 2-1 2-12. Bench Mounting ... 2-1 2-14. Rack Mounting ... 2-1 2-16. Combination Mounting ... 2-1 2-18. Repackaging for Shipment ... 2-1 Section Page III OPERATING INSTRUCTIONS ... 3-1 3-1. Introduction ... 3-1 3-3. Front and Rear Panel Description ... 3-1 3-5. Operating Instructions ... 3-1 3-6. Mechanical Zero Adjustment . 3-1 3-8. Turn-On Procedure ... 3-1 3-11. DC Measurements ... 3-1 3-12. Resistance Measurements . . 3-1 3-13. AC Measurements ... 3-2 3-16. DB Measurements ... 3-2 Section Page IV THEORY OF OPERATION ... . 4-1 4-1. General ... . 4-1 4-5. DC Operation ... . 4-1 4-7. Ohms Operation ... . 4-1 a n An A 1 4-12. Circuit Descriptions ... . 4-2 4-13. DC Amplifier (Al) ... . 4-2 4-16. DC Offset (A2) ... . 4-2 4-19. AC Metering Circuit (A2). . . . 4-3 4-23. Battery Regulator Al ... , 4-3 Section Page V MAINTENANCE ... . 5-1 5-1. Introduction ... . 5-1 5-3. Required Equipment ... . 5-1 5-5. Performance Checks ... . 5-1 Section Page V MAINTENANCE (Cont'd) 5-7. AC Accuracy and Frequency Response Check ... 5-1 5-14. Resistance Accuracy Check. . 5-2 5-16. DC Accuracy ... 5-2 5-18. AC Rejection Check ... 5-3 5-20. Input Impedance Check ... 5-3 5-25. Adjustment and Calibration Procedures ... 5-4 5-27. Cover Removal ... 5-4 5-30. Amplifier Balance and Zero Offset Adjustment ... 5-5 5-31. Regulator Adjust ... 5-5 5-32. AC Calibration ... 5-5 5-36. Resistance Infinity Adjustment 5-6 5-38. DC Calibration ... 5-6 5-40. Alternate Performance Checks and Calibration Procedures. . 5-6 5-42. AC Circuits ... 5-6 5-45. Resistance Circuits ... 5-6 5-47. DC Circuits ... 5-7 5-50. AC Rejection ... 5-7 5-52. Input Impedance Check . . . . 5-7 5-54. Battery Replacement ... 5-7 5-56. Troubleshooting ... 5-7 5-60. Power Supply ... 5-8 5-63. DC Amplifier ... 5-8 5-67. AC Metering Circuit ... 5-8 5-71. Adjustment of Factory Selected Components ... 5-8 5-73. A1R19* ... 5-8 5-75. A2C2* ... 5-9 5-77. A2R14* ... 5-9 5-80. A2R16* ... 5-9 5-82. Etched Circuit Board Repair. . . 5-9 Section Page VI CIRCUIT DIAGRAMS ... . 6-1 6-1. Introduction ... . 6-1 Section Page vn REPLACEABLE PARTS ... . 7-1 7-1. Introduction ... . 7-1 7-4. Ordering Information ... . 7-1 7-6. Non-Listed Parts ... 7-1 Appendix A CODE LIST OF MANUFACTURERS B SALES AND SERVICE OFFICES C MANUAL BACKDATING CHANGES

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