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- Keithley Applications
- Posts: 2849
- Joined: June 10th, 2010, 6:22 am
- Country: United States
The effective input capacitance in coulombs mode is the
feedback capacitor times the open loop gain of the input stage.
In both meters this gain is at least 4xE6.
The 20nC and 200nC ranges of the 6514 use a 1nF capacitor,
giving an effective capacitance of 4 milli farads.
The 2uC and 20uC ranges use a 100nF capacitor, and the effective
capacitance is 400 milli farads.
On the 2nC and 20nC ranges of the 6517A use a 100pF capacitor
giving an effective capacitance of 400uF.
The 200nC and 2uC ranges use a 10nF capacitor, giving an effective capacitance
of 40 milli farads.
That doesn't answer my question. What I really need is the input imedance. Is there a resistor between the input and the integrator? If so, what is the value and does it change with range? This is important because we are looking at fast current pulses and any voltage (IR drop) across the input will reduce the voltage across the device under test.
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