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Hewlett Packard 413AR Level Meter
Manufacturer:
Model:
413AR
Date:
1962
Class:
Type:
SubType:
DC Null Voltmeter

Information

The Model 413A DC Null Voltmeter is a zero-center dc voltmeter with end scale ranges from 1 mv to 1000 volts in a 1-3-10 sequence. Input impedance varies from 10 megohms to 200 megohms depending on the setting of the RANGE (VOLTS) switch. The input terminals are isolated from the cabinet and ground permitting operation from references up to 500 volts dc or 130 volts ac from ground potential. INDICATORS. In addition to the conventional meter, which has both a normal (± 10% of full scale) and expanded (± full scale) range of zero adjustment, the Model 413A has Amplifier output connectors which provide an output voltage proportional to meter deflection. This feature makes it possible to use the Model 413A as a dc Amplifier for use with thermocouples, etc., or to use it in conjunction with a recorder to obtain permanent records without the need for constant monitoring. USES. The Model 413A may be used for any application that calls for a dc null voltmeter. High input impedance of the instrument makes it especially valuable for resistance bridge measurements. The high voltage gain and the exceedingly low drift and noise make the Model 413A an ideal instrument for many control applications, particularly where the system must be left unattended for long periods of time.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
41
Size:
5.90 Mbytes (6186348 Bytes)
Language:
english
Revision:
Manual-ID:
00413-90003 and/or 01138-5
Date:
01 November 1966
Quality:
Scanned document, all readable.
Upload date:
31 May 2020
MD5:
17bb1f889d72107ffdc26cbfbee9792b
Downloads:
59

Information

Serial Prefix 315- * Appendix C, Manual Backdating Changes, adapts this manual to serial prefix 139-, Serials Below 315-02311. Section Page I GENERAL INFORMATION ... 1-1 1-1. Introduction ... 1-1 1-4. Description ... 1-1 Section Page E 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. Repackaging for Shipment ... 2-1 Section Page HI OPERATING INSTRUCTIONS ... , 3-1 3-1. Introduction ... , 3-1 3-5. Controls ... , 3-1 3-7. Operating Instructions ... , 3-1 Section Page IV THEORY OF OPERATION ... 4-1. General ... 4-1 , 4-1 4-3. DC Input Circuits ... , 4-1 4-5. AC Circuits ... , 4-1 4-9. DC Output Circuits ... , 4-2 4-11. Power supply ... , 4-2 Section Page V MAINTENANCE ... . 5-1 5-1. Introduction ... 5-3. Test Instruments Required ... 5-1 , 5-1 5-5. Cabinet Removal ... . 5-1 5-7. Troubleshooting ... 5-8. General ... , 5-1 . 5-1 5-10. Amplifier-Power Supply ... . 5-2 Section V (Cont’d) Page 5-12. Chopper Assembly ... 5-2 5-14. Modulator ... 5-2 5-16. Demodulator ... 5-3 5-18. Repair and Replacement ... 5-19. General ... 5-4 5-4 5-21. Modulator Replacement ... 5-4 5-23. Demodulator Replacement . . . . 5-4 5-25. Range (Volts) Switch Replacement 5-4 5-27. Tube Replacement ... b-4 5-29. Adjustments and Calibration . . . . 5-6 5-31. Mechanical Zero Adjustment . . . b-6 5-33. Hum Balance ... 5-34. Bias Adjust ... 5-6 5-6 5-35. Amplifier Gain Calibration . . . . 5-6 5-37. Meter Calibration ... 5-6 5-38. Performance and Verification . . . . 5-7 5-40. Voltmeter ... 5-7 5-41. AC Rejection ... 5-42. Amplifier Output ... 5-7 5-7 Section Page VI REPLACEABLE PARTS ... 6-1 6-1. Introduction ... 6-1 6-4. Ordering Information ... 6-1 6-6. Non-Listed Parts ... 6-1 Appendix A CODE LIST OF MANUFACTURERS Appendix B SALES AND SERVICE OFFICES Appendix C MANUAL BACKDATING CHANGES

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