Fluke 5820A, Service Manual

Page: 58 / 158

5820A
Service Manual
3-20
3-25. DC Voltage Verification
This procedure uses the following equipment:
•
Hewlett-Packard 3458A Digital Multimeter
•
BNC(f) to Double Banana adapter
•
50
Ω
feedthrough termination
•
N to BNC cable supplied with the
Scope Calibrator
Set the Calibrator Mainframe to the Volt menu. Follow these steps to verify the wave
generator function.
3-26. Verification at 1 M
Ω
For the 1 M
Ω
verification, connect the Calibrator Mainframe’s CHAN 1 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 M
Ω
(The blue softkey under
Output @ toggles the impedance between 50
Ω
and 1 M
Ω
).
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 3-5. Press
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 3-5.
4. Compare result to the tolerance column.
3-27. Verification at 50
Ω
For the 50
Ω
verification, connect the CHAN 1 connector to the HP 3458A input, using
the cable and the 50
Ω
termination connected to the N to 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 M
Ω
).
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 3-6. Press
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 3-6.
4. Multiply the readings by (0.5 * (50 + Rload) / Rload), where Rload = the actual
feedthrough termination resistance, to correct for the resistance error.