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Model 6517B Electrometer Reference Manual
Section 3: Connections
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
6517B-901-01 Rev. C / August 2015
3-3
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