12
C
ALIBRA
TION
G-5500 A
Z
-E
L
R
OTATOR
Azimuth Offset Null
r
Before calibrating the Rotator, check to see that the
GS-
232A
’s DIP switch (switch 5)
is set to the “
ON
” posi-
tion.
r
From the Controller panel, set the Rotator fully counter-
clockwise (set to 0°).
r
Press [
O
]
Ž
[
↵
] (the letter “oh”, and “
E
NTER
”) on the
computer keyboard to activate the azimuth calibration
routine. The computer display should show
AZ
aaaa
=
bbbb
returned from the Interface Board, where
aaaa
and
bbbb
are four-digit numbers padded at the left with
zeroes.
r
Adjust the
AZ
trimmer (located on the bottom case of
the
GS-232A
) while watching the computer display, until
the four-digit numbers
aaaa
and
bbbb
are the same
(the precise values are not important).
r
Turn off the
GS-232A
’s
POWER
switch to exit the azi-
muth calibration routine, then turn on the
GS-232A
’s
POWER
switch again.
Azimuth A-D Calibration
r
From the Controller panel, set the Azimuth Rotator fully
clockwise (to the right).
r
Press [
F
]
Ž
[
↵
] (F and
E
NTER
) on the computer keyboard
to activate the Control Interface’s azimuth A-D converter
calibration routine. The computer’s display should show
+
aaaa
, where
aaaa
is a four-digit number which indi-
cates the azimuth heading in degrees.
r
Adjust the
OUT VOL ADJ
potentiometer on the “
A
ZI
-
MUTH
” (left) side of the Controller rear panel so as to get
a reading of “
0450
” on the computer’s display. This
reading (“
0450
: 360 d 90 degrees”) corre-
sponds to the actual beam heading you established when
you pointed the azimuth rotator fully clockwise.
r
Turn off the
GS-232A
’s
POWER
switch to exit the azi-
muth A-D converter calibration routine, then turn on the
GS-232A
’s
POWER
switch again.
