Adjustment Procedures 3
Keysight 3458A Calibration Manual 47
1 Execute the ACAL AC command. Following the autocal, execute the RESET
command.
2 Set the front panel Terminals switch to Front. Set the Guard switch to the To
LO position.
3 Set the synthesizer to deliver a 3 V rms sinewave at a frequency of
100 kHz. Connect the synthesizer, the 3 V thermal converter, and the
multimeter as shown in Figure 3-4. Record the exact DC voltage measured by
the multimeter on Line A of the Adjustment Record.
The voltages referenced in this procedure are 3 V, 1 V and 100 mV rms for the
SCAL 10, SCAL 1, and SCAL .1 commands, respectively. If necessary, you can
use any value between 3 V and 10 V rms wherever 3 V is referenced, 300 mV to 1
V rms wherever 1 V is referenced, and 30 mV to 100 mV wherever 100 mV is
referenced (make sure not to exceed the voltage rating of the thermal
converters). (You still execute the SCAL 10, SCAL 1, and SCAL.1 commands
regardless of the rms voltage value used). Whenever making low-level
measurements, take precautions to minimize noise and interference in the test
setup. Refer to Test considerations in Chapter 4 for more information.
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