Multicode Output (87-6002-XL1)
Installation
The XL-GPS only allows one Multicode Output module, therefore the card ID number should
be set to 1. The card ID number is set by changing the SW2 DIP switch settings. The unique
card ID number has no relation to the physical location of the card in the option bays. For the
XL-GPS, set individual switches using the following table:
Card ID
#
SW2-
1
SW2-
2
SW2-
3
SW2-
4
1 Off Off Off Off
Note: Follow good ESDprecautions when handling this board.
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 XL-GPS and retain the screws.
Install the Multicode card in the XL-GPS. Use a top slot so the output level and modulation
ratio potentiometers are accessible by removing the top cover from the XL-GPS 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.
The default factory configuration is 3Vp-p amplitude with 3:1 ratio (1Vp-p for low signal.)
Repeat steps 3-5 for OUTPUTS 2 through 4 using the following potentiometers for
amplitude and ratio:
OUTPUT1 OUTPUT2 OUTPUT3 OUTPUT4
AMPLITUDE LEVEL1 (R90) LEVEL2 (R85) LEVEL3 (R57) LEVEL4 (R41)
RATIO RATIO1 (R91) RATIO2 (R81) RATIO3 (R42) RATIO4 (R15)
098-00116-000 Rev. A............................... Page 159 of 221
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