You should probably do the following:?
0) Connect CAL OUTPUT signal to RF input.
1) Press GREEN BUTTON, then RECALL followed by 8.? Adjust the amplitude to -10db using AMPLITUDE ADJUST next to the RF input.
2) Press GREEN BUTTON followed by RECALL 9.? Adjust for the highest amplitude line using FREQUENCY ZERO pot on 85662 front panel next to the CRT and just below the INTENSITY control.
3) with the CAL signal still connected to the RF input press GREEN BUTTON, then FREQUENCY SPAN.
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The 8566 will run a calibration test of the gain and filters.? If it stalls with AMPL ADJ, there is a problem.? The attenuator is a possible cause, and there are others.
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Note: Test results are invalid unless 0 - 2 are done properly and the results are as expected.
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If the test completes, press BLANK on the 85662, and BLUE BUTTON followed by LINE for a list of deviation from perfect for a number of gain and BW settings.? You may need to press HOLD to remove any overwritten messages.
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This procedure is covered in the section discussing front panel diagnostics.? It gives a reasonable overview of the instruments state of calibration.? The data is stored internally and can be used to correct measurements.
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NOW you are getting to the fun part !!
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Cheers!
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Bruce
