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5
Verification and Performance Tests
Test Considerations
Test Considerations
Errors may be induced by AC signals present on the input leads during a
self- test. Long test leads can also act as an antenna causing pick- up of AC
signals.
For optimum performance, all procedures should comply with the
following recommendations:
• Assure that the calibration ambient temperature (T
• Assure that the ambient relative humidity is less than 80%.
• Allow a 60- minute
• Use shielded twisted- pair of Teflon- insulated cables to reduce settling
• Connect the input cable shields to earth ground. Except where noted in
Because the instrument is capable of making highly accurate
measurements, you must take special care to ensure that the calibration
standards and test procedures used do not introduce additional errors.
Ideally, the standards used to verify and adjust the instrument should be
an order of magnitude more accurate than each instrument range of full
scale error specification.
For the DC voltage, DC current, and resistance gain verification
measurements, you should take careful measures to ensure that the
calibrator "0" output is correct. You will need to set the offset for each
range of the measuring function being verified.
[1] 120-minute warm-up period for instrument adjustments (calibration). See
140
between 18 °C and 28 °C. Ideally the calibration should be performed
at 23 °C ± 2 °C.
[1]
the V (red) and LO (black) input terminals.
and noise errors. Keep the input cables as short as possible.
the procedures, connect the calibrator
calibrator. It is important that the
made at only one place in the circuit to avoid ground loops.
Procedures," starting on page 171 for more information on the calibration procedures.
warm- up period with a shorting plug connected to
LO
to earth ground connection be
LO
) is stable and
cal
source to earth ground at the
Chapter
6, "Calibration
U3606A User's and Service Guide
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