TriPoint VertexRSI 7200, Operation And Maintenance Manual

Page: 59 / 266

INST ALLA TIO N
4 - 1 3
Refer to Tab l e 4-1 0 and connect the ana l og i nputs to J 9 (9-p i n D-connector) on the
rear pane l of the 7 2 0 0 A C U.
TAB L E 4-10
ANA L OG I N P UT CONNECT I ONS
J9 DES I GNAT I ON FUNCT I ON
1 GND S i g Ground
2 A D 1 + Channe l 1( + ) *
3 A D 1 GND Channe l 1 (GND)
4 A D 2- Channe l 2(-) *
5 SPARE No Connect i on
6 GND S i g Ground
7 A D 1- Channe l 1(-) *
8 A D 2 + Channe l 2( + ) *
9 A D 2 GND Channe l 2 (GND)
* Standard connect i on procedure.
4.3.6.1 A/D C a r d C a li b r a t i on
A ca li brat i on procedure i s norma ll y performed at the factory as part of the product
conf i gurat i on, therefore a f i e l d ca li brat i on i s on l y performed i f operat i ona l prob l ems
due to dr i ft are encountered at a l ater date, or i f d i fferent v i deo rece i vers are used
i n the A G C mode. Shou l d f i e l d ca li brat i on be necessary, refer to A ppend i x D for the
ca li brat i on procedure.
The A /D converter daughter card i s used to convert ana l og D C vo l tage l eve l s
represent i ng track i ng s i gna l l eve l s i nto a d i g i ta l format su i tab l e for the 7 2 0 0 A C U
process i ng rout i nes. It has t w o i ndependent converter channe l s, each of w h i ch has
the capab ili ty of convert i ng li near track i ng rece i ver vo l tage l eve l s or v i deo A G C
vo l tage l eve l s i nto a d i g i ta l format. Refer to eng i neer i ng dra w i ngs Sect i on 8 for a
schemat i c and p i ctor i a l v i e w of the fo ll o w i ng d i scuss i on.
S i te des i gnators i n parentheses i nd i cate the channe l 2 s i gna l path. The i nput s i gna l
i s coup l ed i nto the board through J 9R. From here the s i gna l s are routed to JP1
(JP2) w h i ch e i ther coup l es the s i gna l i nto U 4 (U 5) for A G C mode operat i on or
bypasses the operat i ona l amp li f i er cha i n. The s i gna l then goes i nto the A /D
converter U 1 (U 2) w here i t i s d i g i t i zed us i ng a dua l s l ope i ntegrat i ng converter.
TP1 (TP2) are test po i nts w h i ch w hen used i n con j unct i on w i th TP3, (ana l og
ground), enab l e the user to mon i tor the actua l vo l tage be i ng presented to the card.
TP4 (TP5) are test po i nts w h i ch w hen used i n con j unct i on w i th TP3, (ana l og
ground), enab l e the user to mon i tor the vo l tage be i ng presented to the A /D
converter. Th i s can vary from the i nput at TP1 (TP2) i f the A G C mode i s se l ected.