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Operation
Clock Synthesizer 13.5 GHz User Guide
45
The next test is to check the output amplitude control. With the frequency
adjusted to some desired value, scroll the display menu to the position of
amplitude adjustment, AMP. Use the Chan button to select the desired channel
for amplitude adjustment. In this case select A3, for the amplitude adjustment
of the signal on CH3. Use the Digit button to select the digit to increment, for
this example select the 100mV position. Then use the Value button to
increment or decrement the output of CH3B. The user should verify that the
peak-to-peak signal amplitude on the scope is changing to each new
programmed value. By changing the channel to A4, the user should similarly be
able to adjust the amplitude of the signal emanating from the CH4 ports. Please
note that changing the amplitude A3, changes the amplitude on all the channel
3 ports (CH3A, CH3B and their respective complements). The same is true of
changing the amplitudes, A1, A2, A3 or A4, on any of the respective channels.
As the user is incrementing the signal level higher, the front panel Unleveled
LED may light. This is an indication that the signal output is no longer
calibrated to the front panel display value. The Unleveled LED will light when
any of the channel outputs become un-calibrated in this manner.
In this example channels 3B and 4B were sent to the DCA, and CH3B
complement as sent to the spectrum analyzer. However the experiment will
work just as well with any permutation of the channels including the front
panel channels.
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