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The error sources listed above are both time and temperature dependent, so we recommend frequent "Low I
DC Calibration" - if you need accurate measurement of absolute currents at pA levels. The procedure runs
fairly quickly, so daily or weekly calibration should not be too inconvenient.
The Low I DC Calibration is not a full calibration. You must run a full DC Calibration on
your Reference 3000 before you first run the "Low I DC calibration". Remember that the
Reference 3000 must have a full DC calibration on the same type of cable you are using
for the Low I DC Calibration.
Chapter 4 -- Installation--Calibration
NOTE
4 - 16
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