User`s manual

A-Chain Alignment Procedures
Notes
4-17
b. Optical Preamplifier Adjustments
Disconnect the RTA from the left test point and connect it to the right test point
R. Then repeat Steps 12 and 13.
NOTE: The azimuth and high frequency response
must be the same at both the left and right test points.
If results are not similar, it may be necessary to
remove the lens and check for oil or contamination or
a degraded slit. Replace the lens, if necessary. Do
not proceed to the next step until the outputs at
both the left and right test points are similar.
The test in this step is performed both at the right and left channel test points of
the Cat. No. 510 card.
The frequency response must be within 1 dB to at least 12 kHz. Adjust the L high
freq and R high freq potentiometers on the Cat. No. 510 card for the most
extended high frequency response without “peaking.” If these adjustments do
not improve the frequency response, the problem may be a degraded slit or
damage to the lens.