Transformer Testing
AVTMTO3XX Rev 3 Sept 2013
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the reading is valid. Customers have the choice of saving and
continuing readings without a stable reading. Usually, this will be
after a certain amount of time, the reading is 99% stable and the
customer feels the readings are acceptable. If the Save Results
button is pushed immediately after starting a test, then data could
be saved with low stability numbers. The second thing that causes
stability readings to become low is measuring low resistance
readings with low current levels. The input signals for the
instrument will be so low that the reading fluctuate at a larger
percentage of the reading level. To help resolve this issue, test at
the highest possible current level. For very low resistances,
change the stability time duration to 180 seconds, This will
average more measurements together and effectively reduce the
noise level for really low measurement values.
e. Save Results – When the user has the readings he accepts as valid, he can
press the Save Results Button and the data
f. Finish – Shuts down the Measurement software and transfers all data back to
PowerDB.
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