172 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
1
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:
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.
Card ID # SW2-1 SW2-2 SW2-3 SW2-4
1 Off Off Off Off
2OnOffOffOff
3 Off On Off Off
4OnOnOffOff
5 Off Off On Off
6OnOffOnOff
7 Off On On Off
8 OnOnOnOff
9 Off Off Off On
10 On Off Off On
11 Off On Off On
12 On On Off On
13 Off Off On On
14 On Off On On
15 OffOnOnOn
16 On On On On
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