Keithley 610C Solid State Electrometer

The Keithley 610C Solid State Electrometer is a precision instrument for measuring extremely low currents, high resistances, small charges, and DC voltages with high sensitivity and minimal noise. Built on discrete transistor construction with MOSFET inputs, it delivers the stable, low-drift performance demanded in scientific research, materials characterization, and precision electrical testing.

– Technical Specifications

Voltage Measurement
• 11 ranges: 0.001 V to 100 V full scale (1× and 3× steps)
• Input resistance: >10¹⁴ Ω shunted by 20 pF
• Selectable input resistance: 10 Ω to 10¹¹ Ω in decade steps
• Accuracy: ±1% of full scale (exclusive of noise and drift)
• Zero offset drift: <1 mV per 24 hours; <150 µV per °C (post warm-up)
• Meter noise: ±25 µV maximum (input shorted, most sensitive range)

Current Measurement
• 28 ranges: 10⁻¹⁴ A to 0.3 A full scale
• Accuracy: ±2% of full scale (0.3 A to 10⁻¹¹ A); ±4% (3 × 10⁻¹² A to 10⁻¹⁴ A)
• Meter noise: <±3 × 10⁻¹⁵ A
• Offset current: <5 × 10⁻¹⁵ A

Resistance Measurement
• 25 linear ranges: 100 Ω to 10¹⁴ Ω full scale (1× and 3× steps)
• Accuracy: ±3% of full scale (100 Ω to 10¹⁰ Ω); ±5% (3 × 10¹⁰ Ω to 10¹⁴ Ω)

Charge Measurement
• 17 ranges: 10⁻¹³ C to 10⁻⁵ C (Ampere-seconds) full scale
• Accuracy: ±5% of full scale across all ranges
• Offset current drift: <5 × 10⁻¹⁵ C per second

Amplifier
• Selectable gain: 0.3 to 3000
• Frequency response (±3 dB): DC to 40 kHz (gain = 1); 100 Hz to unspecified upper limit (maximum gain)
• Unity gain output: DC input equals output

Power & Stability
• AC line operation with ±120 V supplies
• Line stability: 10% voltage change yields <10 µV meter deflection

– Key Features

• MOSFET input stage for ultra-low input current and noise
• Wide measurement range across voltage, current, resistance, and charge parameters
• Direct ±100 V measurement capability without input divider
• Teflon-insulated PL-259 input connector
• Dual output options: Amphenol 80-PC2F recorder connector (±3 V or ±1 mA); unity gain and chassis ground binding posts

– Physical Specifications

275 mm H × 175 mm W × 290 mm D; 4.8 kg (11 lb).

– Compatibility & Integration

Accessory compatibility details provided in associated documentation.