Test Considerations; Input Connections - Agilent Technologies U3401A User's And Service Manual

4 Performance Test

Test Considerations

For optimum performance, all procedures should comply with the
following recommendations:
• Ensure that the calibration ambient temperature is stable and between
• Ensure ambient relative humidity is less than 80%.
• Allow a one- hour 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. Connect the calibrator
Because the instrument is capable of making very 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 full- scale error
specification.

Input Connections

Test connections to the instrument are best accomplished using the dual
banana plug with copper wire short between two terminals for
low- thermal offset measurement. Shielded, twisted- pair, Teflon
interconnect cables of minimum length are recommended between the
calibrator and the multimeter. Cable shields should be earth ground
referenced. This configuration is recommended for optimal noises and
settling time performance during calibration.
60
18°C and 28°C. Ideally the calibration should be performed at 23°C
±1°C.
the Hi and Lo input terminals.
noise errors. Keep the input cables as short as possible.
Lo source to earth ground at the calibrator except where noted in the
procedures. It is important that the Lo to earth ground connection be
made at only one place in the circuit to avoid ground loops.
U3401A User's and Service Guide