Keithley 617 User Manual

6011 CABLE
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INPUT
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MODEL 617
INPIJT
AblPLIFIER
INPVT
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SHIELD
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TO AID
CONVERTER
EQUIVALENT CIRCUT
Figure 2-9. Current Measurements
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2.7.6 Making Charge Measurements
The Model 617 is equipped with three coulombs ranges to
resolve charges as low as 1OfC (10-W) and measure as high
as 20nC (20 X 10-K). When the instrument is placed in one
of the coulombs ranges, an accurately known capacitor is
placed in the feedback loop of the amplifier so that the
voltage developed is proportional to the integral of the input
current in accordance with the formula: V = -$- j idt. The
voltage is scaled and displayed as charge.
Figure 2-10. Voltage Burden Considerations
NOTE
After measuring high voltages in volts, or
following an overload condition in ohms, it may
2-13

Keithley 617 Specifications

General

Brand	Keithley
Model	617
Category	Measuring Instruments
Language	English