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5560A/5550A/5540A
Service Manual
To calibrate the amps ac function:
1. Set the 8588A as follows: Volts ac, Range Auto, Wide Bandwidth, Coupling: DC 10 M 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 20.
6. Make sure that the DUT is in Standby.
7. Calculate the shunt resistance in Ω from calibration records and/or regression analysis for all
shunts listed in Table 16. Use the A40B series instruction manual for guidance for how to calculate
shunt ac resistance for every point in the calibration record.
8. Record the shunt resistance for each step in Ω in the Shunt_R column in Table 16.
9. Toggle the power switch of the A40B-1 mA shunt to ON. Continue only if the power light is
illuminated and the BATT LOW is off.
10. Start with step 1. Set the output from the DUT. Measure with the 8588A and record in the DMM
Reading on Shunt Output [V] column of Table 16.
11. Continue with step 2, Table 16.
12. Complete steps 1 to 5.
5560A
42
Figure 20. Amps AC with A40B-1mA
A40B-1mA
8588A
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