TM 11-4920-292-15
CHECK, E2 CHECK, ∆ 180 MIN-
NOTE
UTES, and ∆ 270 MINUTES and po-
If a null cannot be obtained using only
larity determined at that time can be
the E2 VOLTS vernier, the compass
used in any subsequent calibration of
transmitter probably is out of toler-
the same compass transmitter. If these
ance.
values are available, the procedures
(8) Repeat the procedure given in (7)
given in c and d below maybe omitted.
above twice, tapping the compass transmitter
lightly before each null.
c. Determine E1 and E2 voltages for the
(9) Add the six settings recorded in table
compass transmitter as follows:
Cl of the swing data sheet and divide the sum
(1) Set the control console switches as
by 6. Set the E2 VOLTS controls to this aver-
follows :
age value and record value on line C-1 of the
(a) MODE SELECTOR: CAL
swing data sheet.
(b) HEADING SELECTOR: 90 DE-
(10) Set the control console switches as
GREES.
follows :
(c) E2 NORM.-E2 REV.: E2 NORM.
(a) E2 NORM.-E2 REV,: OFF.
(d) READOUT SELECT :0.
(b) E1 NORM.-E1 REV. : E1 REV.
(2) Rotate the turntable assembly to a
(c) READOUT SELECT : 90.
heading of 2700. Tap the compass transmitter
(11) Rotate the turntable assembly to a
lightly.
heading of 1800. Tap the compass transmitter
(3) Adjust the E2 VOLTS controls until
lightly.
the NULL INDICATOR meter indicates a null.
(12) Adjust the El VOLTS control until
Record E2 VOLTS and vernier setting in table
the NULL INDICATOR meter indicates a null.
C1 of the swing data sheet.
Record the El VOLTS and vernier setting in
NOTE
table C2 of the swing data sheet.
If the compass transmitter error at
NOTE
0 is more positive than the error at
If the compass transmitter error at
180 (table B of the swing data sheet),
90 is more positive than the error at
the E2 VOLTS vernier control setting
270 (table B), El VOLTS vernier
should be 500, or less. If the error at
control setting should be 500, or more.
180 is more positive than the error at
If the error at 2700 is more positive
0, the setting should be more than
than the error at 900, the setting
500. If setting is incorrect readjust
should be less than 500. If the setting
the E2 VOLTS (0 to 10) switch by 1
is incorrect, readjust the El VOLTS
volt to achieve the correct vernier
(O to 10) switch as required and ad-
range setting.
just vernier for a null.
(4) Repeat the procedures given in (3)
(13) Repeat the procedures given in (12)
above twice, tapping the compass transmitter
above twice, tapping the compass transmitter
lightly before each null.
lightly before each null.
(5) Rotate the turntable assembly to a
(14) Rotate the turntable assembly to a
heading of 0O. Tap the compass transmitter
heading of 90. Tap the compass transmitter
lightly.
lightly.
(15) Set the El NORM-El REV. switch
(6) Set the E2 NORM.-E2 REV. switch
to E2 REV.
to El NORM.
(16) Adjust the El VOLTS vernier control
(7) Adjust the E2 VOLTS vernier control
until the NULL INDICATOR meter indicates
until the NULL INDICATOR meter indicates
a null. Record the vernier setting in table C2
a null. Record the vernier setting in table C1
of the swing data sheet,
of the swing data sheet.
Change 2 9-9
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