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Background noise change after GPIB connection to Keithley 6485

2502, 6485, 6487 - Support
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franceshu
Posts: 1
Joined: July 30th, 2021, 7:55 am
Country: United Kingdom

Background noise change after GPIB connection to Keithley 6485

Post by franceshu » July 30th, 2021, 7:57 am

Using the Keithley 488B GPIB to USB to connect the Keithley 6485 - to the computer. Using this setup we are able to take the measurement from the - however when connected through the GPIB, the - detects higher background noise (nA). This means we are unable to detect lower currents (pA) when connected to the Labview software. Without the GPIB connection the background noise level is around 2 pA, is there a method to fix this problem?

Thanks

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