Dc Voltage Verification; Verification At 1 Mω; Verification At 50 Ω - Fluke 5500A Service Manual

6-44. DC Voltage Verification

This procedure uses the following equipment:
•
Hewlett-Packard 3458A Digital Multimeter
•
BNC(f) to Double Banana adapter
• 50 Ω feedthrough termination
•
BNC cable supplied with the SC600
For DC voltage verification, refer to Figure 6-3 for the proper setup connections.
Set the Calibrator Mainframe to SCOPE mode, with the Volt menu on the display. Then
follow these steps to verify the wave generator function.
6-45. Verification at 1 M Ω
For the 1 MΩ verification, connect the Calibrator Mainframe's SCOPE connector to the
HP 3458A input, using the cable and the BNC(f) to Double Banana adapter.
Make sure the Calibrator Mainframe impedance is set to 1 MΩ (The blue softkey under
Output @ toggles the impedance between 50 Ω and 1 MΩ).
1. Set the HP 3458A to DCV, Auto Range, NPLC = 10, FIXEDZ = on.
2. Program the Calibrator Mainframe to output the voltage listed in Table 6-19. 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 6-19.
4. Compare result to the tolerance column.
6-46. Verification at 50 Ω
For the 50 Ω verification, connect the SCOPE connector to the HP 3458A input, using
the cable and the 50 Ω termination connected to the BNC to Banana Plug adapter.
Make sure the Calibrator Mainframe impedance is set to 50 Ω (The blue softkey under
Output @ toggles the impedance between 50 Ω and 1 MΩ).
1. Set the HP 3458A to DCV, Auto Range, NPLC = 10, FIXEDZ = on.
2. Program the Calibrator Mainframe to output the voltage listed in Table 6-20. 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 6-20.
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 column.
SC600 Option 6
Verification
6-29