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The Keithley 486 is a 51/2-digit autoranging picoammeter designed for low-current applications where fast reading rates must be made. The 486 is ideal for low-level DC current applications. Selectable analog and digital filters provide optimum wide-band performance with minimum noise. Autoranging selects the most appropriate range within 100ms. The measurement buffer holds up to 512 readings for fast data acquisition. Any reading within the buffer may be displayed, or the entire buffer may be searched for the maximum and minimum values. Other important features include REL, which allows measurements to be made relative to a selectable baseline. ZERO CHECK and CORRECT functions correct for voltage offset errors using front panel or software commands. The IEEE-488 interface provides simple integration and convenient user interaction. Digital calibration can be accomplished over the bus or completely from the front panel. The display features three selectable intensities (bright, dim, and off) for use in light-sensitive environments. Specifications. Ranges: 2 nA, 20 nA, 200 nA, 2 µA, 20 µA, 200 µA and 2 mA. Lowest Range: 2 nA; Resolution: 10 fA; Accuracy (1 year), ±(%rdg+offset): 0.3 + 500 fA. Highest Range: 2 mA; Resolution: 10 nA; Accuracy (1 year), ±(%rdg+offset): 0.1 + 200 nA. Maximum Overload: 350V peak on nA ranges and 2µA range; 50V peak on 20µA, 200µA, and 2mA ranges. Higher voltage sources must be current limited at 3mA. Input Voltage Burden: <200µV (18°–28°C) for inputs <100µA; <2mV for inputs >= 100µA; 20µV/°C temperature coefficient. Temperature Coefficient (0°–18°C & 28°–50°C): ±(0.15 × applicable accuracy specification)/ °C. NMRR: >60dB at 50Hz (LINE 50Hz integration) or 60Hz (LINE 60Hz integration). Analog Output Range: ±2V for full range input (non-inverting). Analog Output Accuracy: ±(2.5% + 3mV); resistive loads >2kO; 18°–28°C. Analog Output Impedance: <100 ohm, DC–2kHz. Ranging: Automatic or manual. Autoranging Time: <200ms to final range (analog filter OFF).
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