Adjusting Amplitude And Modulation Ratio - Symmetricom XLi User Manual

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To set a unique card ID number, compare the SW2 DIP switch settings with those of the other Multicode/
N.8 Frequency Synthesizer cards present. Then set individual switches using the following table as a
guide:
1
Card ID # SW2-1 SW2-2 SW2-3 SW2-4
1 Off
2 On
3 Off
4 On
5 Off
6 On
7 Off
8 On
9 Off
10 On
11 Off
12 On
13 Off
14 On
15 Off
16 On

Adjusting Amplitude and Modulation Ratio

Perform these steps to change the Amplitude and Modulation ratio from the factory defaults. To perform
adjustments:
Remove the top lid of the XLi and retain the screws.
Install the Multicode card in the XLi. Use a top slot so the output level and modulation ratio
potentiometers are accessible by removing the top cover from the XLi chassis. See "Installing or
Removing Option Cards" on page 21.
Using a BNC "T" and coax cables, make a three-way connection between the three following items:
• OUTPUT 1 on the 87-6002-XL1 Multicode option card
• A load with the desired impedance or the target system
• The input connector on an oscilloscope
Adjust potentiometer LEVEL1 (R90) with a tweaker tool for desired voltage amplitude.
Adjust potentiometer RATIO1 (R91) with a tweaker tool for desired voltage ratio.
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Off Off Off
Off Off Off
On Off Off
On Off Off
Off On Off
Off On Off
On On Off
On On Off
Off Off On
Off Off On
On Off On
On Off On
Off On On
Off On On
On On On
On On On
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XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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