Test Considerations - Agilent Technologies U1211A User's Manual And Service Manual

6 Performance Tests and Calibration

Test Considerations

Test Considerations

Long test leads can also act as antennas that pick up AC signal noises.
For optimum performance, all procedures should comply with the
following recommendations:
• Ensure that the ambient temperature is stable between 18 °C and
• Ensure that the ambient relative humidity is less than 80%.
• Place the clamp meter with the non- compensational transfer adapter
• Allow a 5- minute warm- up period during which a shorting plug is used
• Use shielded twisted- pair PTFE- insulated cables to reduce settling and
• Connect the input cable shields to earth. Connect the calibrator LO
Please 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 full- scale error specification.
For DC voltage, DC current, and resistance gain verification
measurements, you should ensure that the calibrator's "0" output is
correct. You will need to set the offset for each range of the measurement
function being verified.
88
28 °C. Ideally, calibration should be performed at 23 °C ± 2 °C.
with miniature thermal probe connected to the input terminal in the
operating environment for at least 1 hour.
to connect the V and COM input terminals.
noise errors. Keep the input cables as short as possible.
source to earth at the calibrator, except where otherwise indicated in
the procedures. It is important that the LO- to- earth connection be
made at only one place in the circuit to avoid ground loops.
User's and Service Guide