Hewlett Packard 419A Level Meter
Manufacturer:
Model:
419A
Date:
Category:
Group:
Description:
DC Null Voltmeter

Information

The Model 419A is housed in a standard -hp-1/2 module case. A rechargeable battery Power supply allows operation independent of ac line. Range and function switching is accomplished by front panel controls. The Model 419A provides 18 end scale dc voltage ranges in a 1, 3, 10 sequence from 3 microvolts to 1000 volts. The Model 419A also provides 7 end scale dc current ranges from 30 picoamps to 30 nanoamps. An internal bucking supply allows voltages up to 300 millivolts to be measured with infinite input impedance. The input impedance for the higher ranges is 100 MΩ

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Service and User Manual
Manual type:
Service and User Manual
Pages:
44
Size:
5.72 Mbytes (5995068 Bytes)
Language:
english
Revision:
Manual ID:
00419-90004
Date:
1972 12
Quality:
Scanned document, reading badly, partly not readable.
Upload date:
2023 07 30
MD5:
483b6623688f6b611edfec33fe264594
Downloads:
69
Service and User Manual
Manual type:
Service and User Manual
Pages:
51
Size:
4.36 Mbytes (4570856 Bytes)
Language:
english
Revision:
Manual ID:
01779-2
Date:
1966 12 01
Quality:
Scanned document, all readable.
Upload date:
2017 12 31
MD5:
cefb79893c342c3fecf25018626fbd34
Downloads:
660

Information

I GENERAL INFORMATION ... 1-1 1-1. Introduction ... 1-1 1-3. 1 E Specifications ... 1-1 i ■i 1-9. itliU X 111 • • • • • Instrument/Manual Identification. 1-1 1-11. Accessory Equipment Supplied . . 1-1 1-13. Accessory Eauinment Available . 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 £ “ I . urounumg requirements ... z-i 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. Controls, Indicators, and Connectors 3-1 3-5. Operating Instructions ... . 3-1 3-7. Turn-On Procedure (Battery One r*n finn ^ <?_1 3-8. Turn-On Procedure (AC Line Operation) ... . 3-1 3-9. DC Voltage Measurements . . . . 3-1 3-10. DC Current Measurements . . . . 3-2 3-17. Applications ... . 3-2 Section Page IV THEORY OF OPERATION ... . 4-1 4-1. Introduction ... . 4-1 4-3. General Description ... . 4-1 4-11. Detailed Description ... . 4-1 4-12. Bucking Supply (See Figure 6-3) . 4-1 4-15. Input Attenuator ... . 4-2 4-17. Input Filter ... . 4-2 4-19. Modulator/Demodulator ... . 4-2 4-23. AC Amplifier ... . 4-2 4-26. 4-30. DC Amplifier ... Meter Circuit ... . 4-2 . 4-2 4-33. Feedback Control ... . 4-2 4-35. Power Supply and Neon Driver (Figure 6-4) ... . 4-3 V MAINTENANCE ... 5-1 5-1. Introduction ... 5-1 5-3. c r Test Equipment ... 5-1 U“U* 5-7. Voltmeter Accuracy Test ... O-L 5-1 5-9. Bucking Voltage Test ... 5-1 5-11. Ammptpr Amiirnnv Tpst ... K-9! 5-13. Response Time Test ... 5-2 5-15. Superimposed AC Rejection Test 5-2 5-17. Noise Test ... 5-2 5-19. Input Resistance Test ... 5-3 5-21. Repair Procedures ... 5-3 5-22. Cover Removal ... 5-3 O-Üft. servicing Fnntea uircuit .Boards 5-3 5-29. Adjustment and Calibration ... 5-4 5-31. Mechanical Zero Adjustment . . 5-4 R-S3 Phnnnpr AHiiiRtmpnt- ... 5-35. Electrical Zero Adjustment. . . 5-5 5-37. Full Scale Calibration ... 5-5 5-39. Battery Test Calibration ... 5-5 5-41. Troubleshooting ... 5-5 5-43. No Response to Input ... 5-5 5-45. Positive or Negatn& Foldover . 5-6 5-47. Excessive Noise ... 5-6 5-49. Troubleshooting the Input At- tenuator ... 5-6 Don! Q pam onf nf XT’n #->+-<"» y*tt Qnl xviiv \_i± x' aukui y Components ... 5-6 Section Page VI CIRCUIT DIAGRAMS ... 6-1 6-1. Introduction ... 6-1 6-3. Schematic Diagrams ... 6-1 6-5. Component Location Diagrams . . 6-1 Section Page VII 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 Appendix B SALES AND SERVICE OFFICES Appendix

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