Fluke 5500A, Service Manual

Page: 210 / 296

5500A
Service Manual
6-84
Calibrator Mainframe display indicates that the next steps calibrate pulse width.
Press the OPTIONS, then STORE CONSTS blue softkeys to store the new
calibration constants.
6-111. Verification
All of the Oscilloscope Calibration functions should be verified at least once per year, or
each time the SC300 is calibrated. The verification procedures in this section provide
traceable results; however the factory uses different procedures and instruments of
higher precision than those described here. The procedures in this manual have been
developed to provide users the ability to verify the SC300 at their own site if they are
required to do so. Fluke strongly recommends that, if possible, you return your unit to
Fluke for calibration and verification.
All equipment specified for SC300 verification must be calibrated, certified traceable if
traceability is to be maintained, and operating within their normal specified operating
environment. It is also important to ensure that the equipment has had sufficient time to
warm up prior to its use. Refer to each equipment’s operating manual for details.
Before you begin verification, you may wish to review all of the procedures in advance
to ensure you have the resources to complete them.
6-112. DC Voltage Verification
This procedure uses the following equipment:
•
Hewlett-Packard 3458A Digital Multimeter
•
BNC(f) to Double Banana adapter
•
50
Ω
feedthrough termination (as required)
•
BNC cable supplied with the SC300
For DC voltage verification, refer to Figure 6-19 for the proper setup connections.
Set the Calibrator Mainframe to SCOPE mode, with the Volt menu on the display. Then
use the next sections to verify the DC Voltage function.
6-113. Verification at 1 M
Ω
For the 1 M
Ω
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 M
Ω
(The blue softkey under
Output Z 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 6-49. 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 6-49.
4. Compare result to the tolerance column.
6-114. 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.