Test Considerations - Agilent Technologies U1241B User's And Service Manual

Test Considerations

Error may be induced by AC signals that present on the input leads. 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:
• Ensure that the calibration ambient temperature is stable and between
• Ensure that the ambient relative humidity (RH) is less than 80%.
• Ensure that the low battery indicator does not appear during the
• During temperature performance verification test, ensure that the meter
• Allow one minute warm- up period with a Shorting Plug connected to
• Use shielded twisted pair Teflon- insulated cables to reduce settling and
• Connect the input cable shields to earth ground. Except where noted in
During DC voltage, DC current, and resistance gain verification
measurements, ensure that the calibrator's "0" output is correct. It is
recommended to set the offset for each range of the measuring function
being verified.
U1241B/U1242B User's and Service Guide
18 °C and 28 °C. Ideally the calibration should be performed at 23 °C
± 2 °C.
performance verification test. If it does, replace the batteries to avoid
any inaccurate reading.
has been switched ON and placed in the test environment for at least
one hour with J/K- type thermo- couple connected between the meter
and calibration source.
the V and COM input terminals.
noise errors. Keep the input cables as short as possible.
the procedures, connect the calibrator LO source to earth ground at the
calibrator. It is important that the LO to earth ground connection be
made at only one place in the circuit to avoid ground loops.
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