3 Adjustment Procedures
42 Keysight 3458A Calibration Manual
DC Gain Adjustment
In this adjustment, the multimeter measures the standard voltage using its 10 V
range. The multimeter then adjusts its gain so that the measured value agrees
with the standard's exact value (specified using the CAL command). The
multimeter then measures its 7 V internal reference voltage using the 10 V range
and stores both the 10 V gain adjustment constant and the value of the internal 7
V reference. This adjustment also automatically performs the DCV autocalibration
with computes DC gain constants.
Equipment required: A DC voltage standard capable of providing 10 VDC (the
resultant accuracy of the 3458A depends on the accuracy of the voltage
standard).
1 Select the DC Voltage function.
2 Set the front panel Terminals switch to Front.
3 Connect the voltage standard to the multimeter's front panel HI and LO Input
terminals as shown in Figure 3-2. If using a Guard wire (as shown in
Figure 3-2). set the Guard switch to the Open position. If not using a Guard
wire, set the Guard switch to the To LO position.
4 Execute the CAL command specifying the exact output voltage of the
standard. For example, if the standard's voltage is 10.0001 VDC, execute CAL
10.0001. The multimeter automatically performs the DC gain adjustment and
the display shows each of the various steps being performed. This adjustment
takes about 2 minutes. When the adjustment is complete, the multimeter
returns to displaying DC voltage measurements.
5 Disconnect the voltage standard from the multimeter.
Voltage standards from 1 V DC to 12 V DC can be used for this procedure.
However, using a voltage standard <10 V DC will degrade the multimeter's
accuracy specifications.
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