5700A/5720A Series II
Operators Manual
4-62
4-68. High Frequency AC Calibration
The High Frequency AC Calibration procedure calibrates the response of the 8840A ac
voltage function from 20 kHz to 100 kHz. If the True RMS AC option is not installed,
selecting this procedure results in an error message.
The calibrator’s output used in this procedure should normally be between 90 and 100
kHz. An output of 100 kHz (nominal) is recommended. For special applications,
performance may be optimized at other frequencies. See “Optimizing AC Calibration at
Other Frequencies” in the 8840A Instruction Manual for more information.
To perform high-frequency ac calibration, proceed as follows:
1.
Ensure that offset and gain calibration has been completed for the VAC function.
2.
Select the High-Frequency AC Calibration procedure by pressing the 8840A HF AC
button. The 8840A displays the first prompt (100 mV AC). The “U” on the 8840A
display indicates the High-Frequency AC Calibration procedure has been selected.
3.
Each time the 8840A prompts you for a reference amplitude, apply this amplitude to
the HI and LO INPUT terminals, and press the STORE button. When you press
STORE, the numeric display field blanks while the 8840A performs the
necessary calculations. (Do not change the reference source while the display is
blank.) The 8840A then displays the next prompt. For reference, all prompts are
shown in Table 4-7.
4.
After the last range is calibrated, the 8840A begins taking readings in the highest
range so that you may verify its calibration. To verify the calibration for the other
ranges, push the corresponding range button. The CAL annunciator remains on.
5.
The calibration procedure is now completed. Exit the calibration mode by pressing
the 8840A CAL ENABLE switch, and attach a calibration certification sticker over
the CAL ENABLE switch.
Table 4-7. 8840A High-Frequency AC Calibration Prompts
Step 8840A Prompt
A 100.0 mV AC
B 1.000V AC
C 10.00V AC
D 100.0V AC
E 200.0V AC
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