Keithley 610
The Keithley 610 Electrometer can measure voltages (with a very high input resistance), very low currents, high resistances and charge. There is a 610BR rack model as well.
The 610 is fully tube-based, with electrometer tubes at the input. The successor model, the Keithley 610B, switched to transistors for the gain stages, and the later Keithley 610C was fully solid-state.
Key Specifications
| Voltage | 10 mV to 100 V full scale in 9 ranges (×1/×3), ±2% FS |
|---|---|
| Input resistance (volts mode) | >1014 Ω // 30 pF, or selectable 1 Ω to 1011 Ω in decade steps |
| Current | 10–13 A to 3 A full scale in 28 ranges (×1/×3), ±3% FS (≤3×10−10 A: ±4% FS) |
| Resistance | 10 Ω to 1014 Ω full scale in 27 linear ranges (×1/×3), ±3% FS (≥3×1010 Ω: ±5% FS) |
| Outputs | Recorder output, 1 mA or 10 V full scale |
| Power | 100−130 V or 200−260 V, 50−60 Hz, 50 W |
Internals
At the core of the 610 is a bootstrapped operational amplifier with a pair of 5886 electrometer tubes at the input and a 12AT7 in the output stage on a +250/–265 V supply.
Links
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Pictures
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Components
Some Parts Used in the Keithley 610
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 0A2 | 154-0001-00 | Gas Discharge Tube (Voltage regulator) | 150 V voltage reference | 110 • 130 • Keithley 610 |
| 0B2 | 154-0075-00 | Gas Discharge Tube (Voltage regulator) | 105-108 V voltage reference | 110 • 190 • E • Hickok 1825 • Keithley 610 |
| 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 |
| 12AX7 | 154-043 • 154-0043-00 | Vacuum Tube (Dual Triode) | dual triode | 3C66 • 513 • 524 • 531 • 531A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 570 • 581 • 581A • 585 • 585A • E • Q • Hickok 1825 • Keithley 610 |
| 12B4 | 154-044 • 154-0044-00 | Vacuum Tube (Triode) | power triode | 126 • 310 • 310A • 316 • 317 • 502 • 502A • 524 • 526 • 541 • 541A • 535 • 535A • 545 • 545A • 546 • 547 • 570 • 549 • 551 • 555 • 513 • 581 • 581A • 585 • 585A • Keithley 610 |
| 5886 | Vacuum Tube (Pentode) | electrometer pentode | Keithley 610 • Keithley 610B | |
| 6BH8 | Vacuum Tube (Triode/Pentode) | triode-pentode combo | Keithley 610 | |
| 6CF8 | Vacuum Tube (Pentode) | low noise audio pentode | Keithley 610 |