Keithley 662 Amplifier
Manufacturer:
Model:
662
Date:
1965
Category:
Group:
Description:

Information

The Keithley model 662 Guarded dc Differential Voltmeter is an extremely precise self-contained, guarded potentiometer. It measures from 100 millivolts to 500 volts with 0,01% limit of error, and below 100 millivolts within 10 microvolts. Since the limit of error includes all stability considerations, the unit need not be periodically calibrated or manually restandardized for a full year. The 500-volt reference supply permits infinite impedance at null for measurements from 0 to 500 volts. Six dials assure that every voltage setting has at least 5-dial resolution. b. Features for convenient use include: six in-line readout dials with automatically lighted decimal points; 10 to 25-millivolt recorder output; input polarity switch; floating operation up to 500 volts off chassis ground; line frequency rejection greater than 45 db. Also, full guarding minimizes leakage problems. OPERATING MODES. The model 662 can be used as a potentiometer or as a conventional vacuum tube voltmeter. As a potentiometer, it measures from 100 millivolts full scale to 500 volts with +/-0.01% limit of error and from 100 microvolts full scale to 100 millivolts within 10 microvolts. As a VTVM, the model 662 measures from 1 millivolt full scale to 500 volts with an accuracy of +/- 3% of full scale. It can also measure resistances from 1 megohm to 100,000 megohms within +/- 5%.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
49
Size:
3.51 Mbytes (3677370 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1965 01 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2020 07 24
MD5:
5cba3597bd6589e1978a4cded0b354a2
Downloads:
333

Information

1. GENERAL DESCRIPTION ... 1-1. Description ... . 1 1-2. . 1 1-3. Applications ... . 1 1-4. Specifications ... . 2 1-5. Accessories ... . 3 1-6. Equipment Shipped ... 2. OPERATION . • ... . 5 2-1. Front Panel Controls . 5 2-2. Rear Controls and Terminals ... . 5 2-3. Preliminary Procedures. . . . 6 2-4. Operating Procedures. . . . . 6 2-5. Recorder Output ... . 8 2-6. Effects Due to Kelvin- Varley Divider Out- put Resistance ... . 9 2-7. Effective Input Resis- tcinc^ « ••••»■«** . 9 2-8. Thermal EMF Precau- . 10 2-9. AC Effects on Measurement . . 10 3. APPLICATIONS ... . 11 3-1. Procedures for Measuring Resistances ... . 11 3-2. Theory of Measuring Resis- . U 4. CIRCUIT DESCRIPTION ... 13 4-1. . 13 4-2. Reference Voltage Supply. . . 13 4-3. Kelvin-Varley Divider . . . . 14 4-4. Null Detector ... . 14 4-5. . 15 5. SERVICING ... 17 5-1. . 17 5-2. Servicing Schedule ... . 17 5-3. . 17 5~4. Troubleshooting ... . 17 5-5. Adjusting Hum Bal Control . . 19 5-6. Zener Diode Replacement , . . 19 5-7. Meter Adjustment ... . 19 6. CALIBRATION ... . 21 6-1. General ... . 21 6-2. Calibration Schedule. . . . . 22 6-3. Kelvin-Varley Divider . . . Verification ... . , . 23' 6-5. Reference Voltage Supply Stability Test ... . 25 6-6. Oscillator Adjustment . . . . 27 7. ACCESSORIES ... . 35 7-1. Model 6601A High Voltage Divider ... . 35 7-2. Rack Mounting ... 7-3. Placing in Rack ... . 36 8. REPLACEABLE PARTS ... . 37 8-1. Replaceable Parts List. . . . 37 8-2. How to Order Parts ... . 37 model 662 Replaceable Parts List ... . 38 Model 6601A Replaceable Farts List ... model 662 Schematic Diagram 1855 IE ... . 47 Model 6601A Schematic Diagram 16321B ... , 49 Change Last Page

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