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Again, I use electrometer 6514 to measure the charge of our sample. At first, I chose 2uc range. When I connected my sample to electrometer, the reading is overflow. However, I chose 20uc range. At first few seconds, the reading changes very quickly and a few seconds latter, it goes overflow. The charge of my sample is only 1 E-8 or even less than this.
We just did the same measurement last week. And the result was fine. But this time, the reading beyond our expectation. I don't know why. I think there might be some problem with the electrometer 6514. Are there anyone who can help me?
- Keithley Applications
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Are you using the same cables?
Is the measurement being performed in the same environment?
Can you input a known voltage into the input of the Model 6514 and see if it makes the proper measurement?
2. To check the Model 6514 in Coulombs mode I suggest the following.
a. Set the Model 6514 to charge mode.
b. Charge up a 1nF(1e-9F) capacitor to 10V.
c. Connect the capacitor to the input of the Model 6514.
d. Disable zero check.
e. Model 6514 should display about 10nC on the 20nC range.
since Q=CV this should work.
If not then maybe the 6514 is in need of service.
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