Keithley 615

The Keithley 616 is a digital electrometer with a 3½ digit Nixie display. The analog circuits are similar to the Keithley 602.

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

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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