Keithley 615

Keithley 615
Electrometer Keithley 615 frontal view Produced from 1969 to (?) Manuals Keithley 615 Manual (All manuals in PDF format unless noted otherwise)

The Keithley 615 is a digital electrometer with a 3½ digit Nixie display. The analog circuits are similar to the Keithley 602.

Key Specifications

Voltage ranges	±100 mV to ±100 V in 4 decade ranges
Voltmeter input	> 1×10¹⁴ Ω // 35 pF
Current ranges	±10^-12 A to ±100 mA in 12 decade ranges
Resistance ranges	10 kΩ to 10¹⁴ Ω FS in 11 decade ranges
Charge ranges	±10^-11 C to ±10^-5 C in 7 decade ranges
Resolution	3½ digits (1999 counts); all nominal ranges have overrange capability to 1.999×
Connections	Input: 2-lug triaxial connector Output: Unity gain output, 4 mm binding posts (equal to input voltage within 100 ppm for output currents of 100 μA or less Current output: ±1 mA FS at up to 1 V, 100% overrange except on 100.0 sensitivity Voltage output: ±1 V FS at up to 0.1 μA, 100% overrange except on 100.0 sensitivity Internal BCD outputs for 6162 Isolated Output
Power	105-125 or 210-250 V_AC, 50-60 Hz, 35 W
Options	Model 4401 Printer Output card (BCD outputs, control inputs)

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