Keithley 6517B Reference Manual

Model 6517B Electrometer Reference Manual Section 3: Connections
6517B-901-01 Rev. C / August 2015 3-3
Connecting PREAMP OUTPUT, COMMON, or 2V ANALOG OUTPUT to earth while floating the
input may damage the instrument.
Figure 11: Maximum input levels
Input protection
The Model 6517B incorporates protection circuitry against nominal overload conditions. However, a
high voltage (>250 V) and resultant current surge could damage the input circuitry. A typical test
circuit to measure the leakage current of a capacitor is shown below. When Switch S is closed, an
initial surge of charging current flows and the high voltage is seen across the input of the Model
6517B.
Figure 12: Capacitor test circuit without protection

Keithley 6517B Specifications

General

Input Impedance	>200 TΩ
Electrometer Type	Electrometer/High Resistance Meter
Current Measurement Range	20 fA to 20 mA
Display	Vacuum Fluorescent Display
Communication Interfaces	IEEE-488 (GPIB), RS-232
Power Supply	100 V / 120 V / 220 V / 240 V; 50 Hz / 60 Hz
Resistance Measurement Range	Up to 200 TΩ