3 Adjustment Procedures
40 Keysight 3458A Calibration Manual
Front Terminal Offset Adjustment
This adjustment uses an external 4-terminal short. The multimeter makes offset
measurements and stores constants for the DCV, DCI, OHM, and OHMF functions.
These constants compensate for internal offset errors for front terminal
measurements.
Equipment required: A low-thermal short made of 12 or 14 gauge solid copper
wire as shown in Figure 3-1 on page 39.
1 Make sure you have performed the steps described previously under
“Preliminary Adjustment Procedures”.
2 Connect a 4-terminal short across the front panel HI and LO Input terminals
and the HI and LO W Sense terminals as shown in Figure 3-1 on page 39.
3 After connecting the 4-terminal short, allow 5 minutes for thermal equilibrium.
4 Execute the CAL 0 command. The multimeter automatically performs the front
terminal offset adjustment and the display shows each of the various steps
being performed. This adjustment takes about 5 minutes. When the
adjustment is complete, the multimeter returns to displaying DC voltage
measurements.
Take precautions to prevent thermal changes near the 4-wire short. You should
not touch the short after it is installed. If drafts exist, you should cover the input
terminals/short to minimize the thermal changes.
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