Fluke 5520A - Page 224

5520A
Service Manual
6-84
2. Program the Calibrator Mainframe to output the voltage listed in Table 6-44. Press
O on the Calibrator Mainframe to activate the output.
3. Allow the HP 3458A reading to stabilize, then record the HP 3458A reading for each
voltage in Table 6-44.
Multiply the readings by (0.5 * (50 + Rload) / Rload), where Rload = the actual
feedthrough termination resistance, to correct for the resistance error. Compare result to
the tolerance (1-year spec.) column.
Table 6-43. DC Voltage Verification at 1 MΩ
Nominal Value (dc) Measured Value (dc) Deviation (mV)
1-Year Spec.
(mV)
0.0 mV 0.10
5.0 mV 0.11
-5.0 mV 0.11
22.0 mV 0.15
-22.0 mV 0.15
25.0 mV 0.16
-25.0 mV 0.16
45.0 mV 0.21
-45.0 mV 0.21
50.0 mV 0.23
-50.0 mV 0.23
220.0 mV 0.65
-220.0 mV 0.65
250.0 mV 0.72
-250.0 mV 0.72
450.0 mV 1.22
-450.0 mV 1.22
500.0 mV 1.35
-500.0 mV 1.35
3.3 V 8.35
-3.3 V 8.35
4.0 V 10.10
-4.0 V 10.10
33.0 V 82.60
-33.0 V 82.60