Fluke 5500A, Service Manual

Page: 186 / 296

5500A
Service Manual
6-60
Set the Calibrator Mainframe to SCOPE mode, with the Overload menu on the display.
Connect the BNC cable to the Calibrator Mainframe SCOPE connector. Then follow
these steps to verify the overload function.
1. Connect the 50
Ω
feedthrough termination to the end of the BNC cable.
2. Program the Calibrator Mainframe output for 5.000 V, DC (OUT VAL blue
softkey), and time limit = 60 s (T LIMIT blue softkey).
3. Press
O
on the Calibrator Mainframe to activate the output and verify that the
OPR display timer increments.
4. Remove the 50
Ω
feedthrough termination before 60 seconds and verify that
Calibrator Mainframe goes to STBY.
5. Reconnect the 50
Ω
feedthrough termination to the end of the BNC cable.
6. Program the Calibrator Mainframe output for 5.000 V, AC (OUT VAL blue
softkey).
7. Press
O
on the Calibrator Mainframe to activate the output and verify that the
OPR display timer increments.
8. Remove the 50
Ω
feedthrough termination before 60 seconds and verify that
Calibrator Mainframe goes to STBY.
6-74. SC600 Hardware Adjustments
Hardware adjustments must be made to the leveled sine and edge functions each time the
SC600 is repaired. In addition to the adjustment procedures, this section provides lists of
the required equipment and some recommendations on models that have the capabilities
required by these procedures. Equivalent models can be substituted if necessary.
6-75. Equipment Required
The following equipment is necessary for performing the hardware adjustments
described in this section. The models listed are recommended for providing accurate
results.
•
Standard adjustment tool for adjusting the pots and trimmer caps
•
Extender Card
•
Oscilloscope Mainframe and Sampling Head (Tektronix 11801 with SD-22/26 or
Tektronix TDS 820 with 8 GHz bandwidth)
•
10 dB Attenuator (Weinschel 9-10 (SMA), or Weinschel 18W-10, or equivalent)
•
Cable provided with SC600
•
Spectrum Analyzer (Hewlett-Packard 8590A)
6-76. Adjusting the Leveled Sine Wave Function
There are two adjustment procedures that need to be made for the leveled sine wave
function. The first procedure adjusts the balance out of the LO VCO so that the signal is
balanced between the two VCOs. The second procedure adjusts the harmonics.