Hewlett Packard 428B Analógico multímetro
Manufacturer:
Model:
428B
Date:
1962
Category:
Group:
Description:
Clip-On Milliammeter

Information

The Model 428B Clip-On Milliammeter measures the magnetic field, which exists around the wire carrying dc current. Operating the instrument Is simple. After zero setting, the two jaws of the Probe are clamped around wire (arrow on Probe head indicates direction of conventional current flow) and the meter will indicate the current. There are nine current ranges starting from 1 ma to 10 amp full scale deflection. The sensitivity can be increased even further by looping the wire several times through the opening in the Probe. The current indication is virtually insensitive to super* imposed ac signals and the series loading of the circuit is less than 0.5 µh. A large amount of feedback provides great stability. With the Mode] 428B currents can be measured as easily as measuring voltages with a voltmeter.

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Serviço e Manual do Usuário
Manual type:
Serviço e Manual do Usuário
Pages:
50
Size:
15.03 Mbytes (15758016 Bytes)
Language:
english
Revision:
Manual-ID:
00428-90002 and/or 01171-4
Date:
01 October 1966
Quality:
Documento Scaned, a leitura parcialmente mal, não parcialmente legível.
Upload date:
31 May 2020
MD5:
3d0b65143cc85f5f1c599452199040ca
Downloads:
484

Information

Serial Prefixed: 131-, 601- Section Page I GENERAL ... 1-1 1-1. Introduction ... 1-1 1-4. Other Probe Heads ... 1-1 1-7. Instrument Identification ... 1-1 n PREPARATION FOR USE ... 2-1 2-1. Unpacking and Mechanical Inspection 2-1 2-4. Operation Check ... 2-1 2-6. Installation ... 2-1 2-8. Power Requirements ... 2-1 2-10. Operation on 115 or 230 Volte. . . . 2-1 2-13. Three Conductor Power Cable . . . 2-1 2-15. Rack-Mount Model ... 2-1 2-17. Preparatlonfor Storage and Shipment 2-1 2-20. Storage ... 2-1 m OPERATION ... 3-1 3-1. Turn-On Procedure ... 3-1 3-4. Mechanical Operation of Probe . . . 3-1 3-6. Electrical Zero Set ... 3-1 3-10. Degaussing of Probe Head ... 3-1 3-13. Measurement Precautions ... 3-1 3-15. Handling of Probe ... 3-1 3-21. Magnetic Fields ... 3*28. AC Fields and Superimposed AC 3-2 Current ... 3-2 3-32. Effect of Instrument on Circuit . 3-2 3-35. Effect of Circuit on Instrument . 3-2 3-37. Measurement Practices ... 3-3 3-38. Polarity of Current ... 3-3 3-40. Increasing the Absolute Sensitivity 3-3 3-42. Current Check Loops ... 3-3 3-44. Use of Output Jack ... 3-3 IV THEORY ... 4-1 4-1. Introduction ... 4-1 4-3. Overall Operation ... 4-1 4-9. Current Probe ... 4-1 4-19. 20 KC Oscillator ... 4-2 4-23. Head Drive Amplifier ... 4-2 Section Page IV THEORY (Cont'd) 4-25. Detector Gate Amplifier ... 4-2 4-28. 40-KC Input/Amplifier Circuit . . . 4-3 4-30. Synchronous Detector and Filter (C24) ... 4-3 4-36. DC Amplifier ... 4-4 4-43. Negative Feedback Current Circuit . 4-4 4-45. 40 KC Phase Shifter ... 4-5 4-48. Power supply ... 4-5 V MAINTENANCE ... 5-1 5-1 5-7. Mechanical Zero-Set ... 5-1 5-9. Cleaning of Probe Jaws ... 5-1 5-11. Test Equipment ... 5-1 5-13. Test Instruments ... 5-1 5-14. Auxiliary Equipment ... 5-1 5-15. Adjustment After Tube Replacement 5-5 5-21. Trouble Localization ... 5-5 5-26. Probe ... 5-5 5-28. Power supply ... 5-5 5-29. Oscillator-HeadDrive Amplifier. 5-5 5-30. Head Drive ... 5-6 5-31. Synchronous Detector ... 5-6 5-32. DC Amplifier ... 5-6 5-33. Adjustment After Current Probe Replacement ... 5-8 5-35. Complete Adjustment Procedure . . 5-8 5-37. Final Check ... 5-12 5-40. Range Calibration ... 5-12 5-42. Meter Tracking ... 5-13/5-14 5-45. Loop Gain ... 5-13/5-14 VI REPLACEABLE PARTS ... 6-1 6-1. Introduction ... 6-1 6-4. Ordering Information ... 6-1 Appendix A CODE LIST OF MANUFACTURERS B SALES AND SERVICE OFFICES

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