Errors in Low Current Measurements (3)
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One of the most common causes of error when measuring low currents (<1nA) is offset current, which can come from the test setup or the measuring instrument.
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One of the most common causes of error when measuring low currents (<1nA) is offset current, which can come from the test setup or the measuring instrument. Potential Cause: Detector Dark CurrentPhotomultiplier tubes usually have a small current flowing even when they are not illuminated.
Remedies
This current can be cancelled out from the measurement by using the
built-in zero suppression feature of the picoammeter or electrometer. |
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