Keithley 660A
The Keithley 660A is a differential voltmeter that includes a Kelvin-Varley divider and a reference source up to 500 V.
The Keithley 660A can be used as potentiometer or as VTVM. As potentiometer it can measure from 100 microvolts full scale to 500 volts, with an error lower than 0.02% in the ranges from 100 mV up. As VTVM it reads from 1 mV to 500 V, with a 3% accuracy, and resistances up to 100.000 megahoms. Input resistance depends upon the selected range, being 50 MOhms from 0.1 V full scale, and rises to infinity at the null. The meter includes the 500 VDC precision voltage reference, the Kelvin-Varley divider and the chopper-stabilized null detector.
Key Specifications
| Voltage ranges | ±1 mV to ±500 V in decade ranges |
|---|---|
| Voltmeter input | 50 MΩ to infinity |
| Connections |
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| Power | 105-125 or 210-250 VAC, 50-400 Hz, 45 W |
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Components
Some Parts Used in the Keithley 660A
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 0G3 | 154-0291-00 | Gas Discharge Tube (Voltage regulator) | 85 V voltage reference | 132 • 506 • 547 • 560 • 561 • 561A • 561S • 564 • 565 • 567 • 661 • TU-4 • Z • Keithley 610 • Keithley 660A |
| 12AU7 | 154-041 • 154-0041-00 • 154-0287-00 | Vacuum Tube (Dual Triode) | dual medium-μ triode | 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825 • Keithley 660A • Pentrix L20 • Pentrix L30 |
| 6CM6 | Vacuum Tube (Pentode) | 12 W beam-power pentode | Keithley 660A | |
| 6CM8 | Vacuum Tube (Triode/Pentode) | triode-pentode combo | Keithley 660A | |
| 7025 | Vacuum Tube (Dual Triode) | dual triode | Keithley 660A |