5520A
Service Manual
3-6
3-5. DC Volts Calibration (NORMAL Output)
The equipment listed in Table 3-2 is required for calibration of the dc volts function. (The
equipment is also listed in the consolidated table, Table 3-1.)
Table 3-2. Test Equipment Required for Calibrating DC Volts
Quan. Manufacturer Model Equipment
1 Fluke 5500A/LEADS Test lead set
1 Hewlett Packard 3458A with -002 Option DMM
1 Fluke 752A Reference Divider
1 Keithley 155 Null Detector
Proceed as follows to calibrate the dc voltage function:
1. On the HP 3458A, perform the ACAL (autocal) ALL and MATH NULL functions as
described in the HP 3458A user documentation.
2. Verify that the UUT (Unit Under Test) is in Standby.
3. Start 5520A calibration as described under the previous heading.
4. Perform an internal DC Zeros Calibration as prompted.
5. Connect the test equipment as shown in Figure 3-1.
6. Measure and enter the values into the UUT for steps 1 through 6 in Table 3-3 as
prompted. You will need to disconnect and reconnect the DMM as prompted during
these steps.
7. Verify that the UUT is in Standby.
8. Connect the DMM and Reference Divider to the UUT as shown in Figure 3-2.
9. For voltages 30 Vdc and above, see the next section.
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