5560A/5550A/5540A
Service Manual
34
The volts ac calibration uses two methods. For frequencies ≤10 Hz low frequency DMM (Fluke 8588A)
is used. For frequencies >10 Hz the calibration is accomplished with Fluke 5790B AC Measurement
Standard.
1. Set the 8588A as follows: Volts ac, Range Auto, Band Wideband, Coupling: DC 10M
Ω, Guard ON
(external guard).
2. Make sure that the DUT is in Standby.
3. Connect a strap between the guard and ground terminals of the DUT.
4. Complete an internal dc zero calibration on the Product.
5. Connect the 8588A to the Product as shown in Figure 17.
Figure 17. Low frequency Volts AC Calibration
6. Start with step 1 in Table 12. Set the Product to Operate. Make a measurement with the meter and
record in the Calculated Product Output column.
7. Continue with step 2.
8. Complete all steps for low frequency (1 to 39).
9. Set the product to Standby.
10. Disconnect the present setup.
11. Connect the product to Fluke 5790B as shown in Figure 18.
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