Ac Adjustment - Agilent Technologies 3458A Calibration Manual

AC Adjustment

3. Set the front panel Terminals switch to Front.
4. Connect the resistance standard to the multimeter's front panel HI and
LO Input and HI and LO Sense terminals as shown in Figure 3. If
using a Guard wire (as shown in Figure 2), set the Guard switch to
the Open position. If not using a Guard wire, set the Guard switch to
the To LO position.
5. Execute the CAL command specifying the exact value of the
resistance standard. For example, if the standard's value is 10.003kW,
execute CAL 10.003E3. The multimeter automatically performs the
resistance and DC current adjustment and the display shows each of
the various steps being performed. This adjustment takes about
12 minutes. When the adjustment is complete, the multimeter returns
to displaying resistance readings.
6. Disconnect the resistance standard from the multimeter.
7. Execute the ACAL AC command (use the AUTO CAL key). This
autocalibrates the multimeter's AC section since the following AC
Adjustment is normally performed only once every two years or
whenever the 03458-66502 or 03458-66503 PC Assembly has been
replaced or repaired. The AC autocalibration takes about 2 minute to
complete.
Figure 3. Resistance and DC Current Adjustment Connections
This adjustment is only required once every two years or whenever the
03458-66502 PC Assembly or the 03458-66503 PC Assembly has been
replaced or repaired. This adjustment sets the internal crystal frequency for
Chapter 3 Adjustment Procedures 27