Bird Technologies 3170A Series - Manual (Page 41)

Re mote mon i tor ing is ac com plished by con nect ing a re corder to the re mote me ter jack, J4. An
X-Y re corder can be used for time log ging of for ward and re flected power per FCC re quire ments
for re mote sites.
Any num ber of me ter pairs can be driven by the me ter am pli fi ers up to 1mA into a to tal load of
470 to 1400 ohms, with out ef fect ing scale shape. Long line losses are com pen sated by ad just ing
am pli fier gain and full scale me ter cur rent af ter net work is bal anced and am pli fier zero set ting.
Usually RFI pre ven tion by shield ing, us ing chokes and by-pass ca pac i tors, is nec es sary only near
the Wattcher unit.
DC Power Sup ply Con nec tions
A dc power sup ply can be con nected to al low for mo bile op er a tion of the Wattcher unit.
The pos i tive ter mi nal of the dc power sup ply must be con nected to Ter mi nal 1. The neg a tive ter -
mi nal must be con nected to ter mi nal 2. The min i mum dc volt age re quired for op er a tion is
+12.7Vdc. The max i mum dc volt age al low able is +16Vdc. The max i mum cur rent draw for this
range is 400mA.
-
B-5
Figure B-7
Re mote Mon i tors
and Me ters
Figure B-8
DC Power Sup ply