Technical data

4Performance Test
60 U3401A User’s and Service Guide
Test Considerations
For optimum performance, all procedures should comply with the
following recommendations:
• Ensure that the calibration ambient temperature is stable and between
18°C and 28°C. Ideally the calibration should be performed at
23°C ±1°C.
• Ensure ambient relative humidity is less than 80%.
• Allow a 30 minutes warm- up period with a Shorting Plug connected to
the Hi and Lo input terminals.
• Use shielded twisted pair PTFE- insulated cables to reduce settling and
noise errors. Keep the input cables as short as possible.
• Connect the input cable shields to earth ground. Connect the calibrator
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.
NOTE
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.