Keithley 263 Calibrator Source With GPIB Interface

The Keithley 263 Calibrator/Source with GPIB Interface is a precision secondary standard designed for calibrating electrometers, picoammeters, and other sensitive instruments requiring accurate low-current and high-resistance measurements. It sources voltage (5 µV to 20 V), current (10 fA to 20 mA), resistance (1 Ω to 100 GΩ), and charge with both active and passive sourcing modes. Passive (V/R) mode minimizes offset errors when voltage burden is small or known; active sourcing delivers constant current output suitable for higher burden conditions.

Technical Specifications

• Built-in range: 5 µV to 20 V; external switching to 200 V


• Ranges: 200 mV, 2 V, 20 V with 1/10/100 steps


• Resolution: 5 µV (200 mV) to 500 µV (20 V)


• Accuracy (1 year): 0.0175% + 15–500 µV depending on range


• Temperature coefficient: 0.002°C⁻¹ (0–18°C, 28–50°C) Current Sourcing


• Range: 10 fA to 20 mA (2 pA to 20 mA)


• Accuracy (1 year): 0.375% + 10 fA (2 pA) to 0.03% (20 mA active)


• Resolution: 0.00005 pA to 500 nA


• Response time: <0.5 s (2 nA–20 mA); 10¹⁴ Ω (2 nA range and above)


• Output capacitance: 12 V Resistance Standards


• Range: 1 Ω to 100 GΩ; nine precision resistors included


• Accuracy (1 year): 0.041% (1 kΩ) to 0.40% (100 GΩ)


• Zero offset: <1 Ω


• Maximum voltage (rated accuracy): 20 V (1 kΩ–10 GΩ), 100 V (100 GΩ) General


• Display: 5½-digit LED with signed 2-digit alphanumeric exponent


• Warm-up: 1 hour to rated accuracy


• Operating environment: 0–50°C; <70% RH (non-condensing to 35°C)


• Power: 105–125 V or 210–250 V AC, 50–60 Hz, 25 VA max


• Dimensions: 127 × 216 × 359 mm (5 × 8½ × 14⅛ in); 3.6 kg (8.1 lbs)

Key Features

• GPIB interface for remote control and data logging


• Dual sourcing architecture (active/passive) minimizes measurement errors across current ranges


• Extremely low output capacitance enables high-impedance measurements


• Nine integrated resistance standards eliminate external calibration artifacts


• Fast settling time on mid-to-high current ranges

Typical Applications

• Electrometers and picoammeter calibration


• Precision current and voltage verification


• High-resistance measurement validation


• Charge measurement standards

Compatibility & Integration GPIB interface enables integration into automated test systems and calibration laboratories requiring traceable voltage, current, and resistance sources.