Keithley 616

Keithley 616
Electrometer Keithley 616 frontal view Produced from 1975 to (?) Manuals Keithley 616 Manual (1980) (All manuals in PDF format unless noted otherwise)

The Keithley 616 is a digital electrometer.

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Key Specifications

Voltage ranges	±10 mV to ±100 V in decade ranges
Voltmeter input	> 2×10¹⁴ Ω // 20 pF
Current ranges	±10^-13 A to ±100 mA in 13 decade ranges
Resistance ranges	1 kΩ to 10¹⁴ Ω FS in 12 decade ranges
Charge ranges	±10^-12 C to ±10^-5 C in 8 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 20 ppm for output currents of 1 mA or less Internal BCD outputs for 6162 Isolated Output
Power	90-125 or 180-250 V_AC, 50-60 Hz, 9 W
Options	Model 6162 Isolated Output/Control provides isolated BCD outputs, remote controls, and remote programming lines

Keithley 616 Teardown thread @ EEVBlog Forum (nice internal photos, mention of replacing the Fairchild SL35155 chip with an 68HC11 microcontroller)
Keithley 616 input stage replacement with MOSFET opamp: Thread @ EEVBlog Forum / Github

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