TM 11-4920-292-15
(2) Apply power to the compass system.
(11) Set the E1 CHECK-E2 CHECK
switch to E2 CHECK.
(3) Set the control console switches as
follows :
(12) Adjust the E2 VOLTS controls until
the NULL INDICATOR meter indicates a null.
(a) E1 NORM.-E1 REV.: E1 NORM.
Record the E2 VOLTS control settings on line
(b) E2 NORM.-E2 REV.: E2 NORM.
F-8 of the swing data sheet,
(c) AREA COMP to value on line A-6
of swing data sheet.
(13) Set the E1 CHECK-E2 CHECK
(d) E1 CHECK-E2 CHECK: OFF.
switch to OFF.
(e) ∆ 180 MINUTES and polarity to
(14) Set the control console switches as
value on line D-3 of swing data sheet.
follows :
(f) ∆ 270 MINUTES and polarity to
(a) MODE SELECTOR: IND.
value on line D-4 of swing data sheet.
(b) READOUT SELECT: EXT CX.
(g) MODE SELECTOR : MON.
(15) Set the HEADING SELECTOR
(h) HEADING SELECTOR : 0 DE-
switch to 0 DEGREES. Synchronize the com-
GREES.
pass system with the synchronizing control on
(i) FV SELECT:
the compass indicator.
1. For ML-1: 1.
2. For DT-309/AJN and T-611/
NOTE
ASN: 2.
Synchronization is accomplished by
(j) READOUT SELECT: F.V.
pressing and rotating the synchroniz-
(k) POWER ON-POWER OFF:
ing knob in the direction of the symbol
POWER ON.
appearing in the annunciator window
(4) Adjust the VOLTS ADJUST control
until the window is blank.
until the EXC VOLTS meter indicates 23.5
(16) Alternately adjust the compensator
volts.
N-S screw and synchronize the compass system
until the HEADING and ERROR readout in-
(5) Record the ERROR readout indication
dicates 0 DEGREES 15 MINUTES. Record
as monitor zero error in line F-1 of the swing
the error in table F1 of the swing data sheet.
data sheet.
(6) Determine the MISAL switch settings
NOTE
from the equation given in section F of the
Allow sufficient time for system syn-
swing data sheet. Record this value on line
chronization to settle out before re-
F-2 of the swing data sheet. Set the MISAL
cording error readings.
MINUTES and polarity switches to this value.
Use the nonmagnetic (brass) screw-
(7) Be sure that E1 CHECK, E2 CHECK,
driver from the alignment equipment
∆ 180 MINUTES, and ∆ 270 MINUTES and
to adjust compensator.
polarity settings have not been changed from
(17) Set the HEADING SELECTOR
those values recorded on lines C-3, C-4, D-3
switch to 90 DEGREES. Alternately synchro-
and D-4 of the swing data sheet. Record these
nize the compass system and adjust the com-
values on lines F-3 through F-6 of the swing
pensator E-W screw until the HEADING and
data sheet.
ERROR readout indicates 90 DEGREES 15
(8) Set the E1 CHECK-E2 CHECK
MINUTES. Record the error in table F1 of the
switch to E1 CHECK.
swing data sheet.
(9) Set the READOUT SELECT switch
(18) Set the HEADING SELECTOR
to 90.
switch to 180 DEGREES. Alternately syn-
chronize the compass system and adjust the
(10) Adjust the E1 VOLTS controls until
compensator N-S screw to remove one-half the
the NULL INDICATOR meter indicates a null.
initial error. Record the error in table F1 of the
Record the E1 VOLTS control settings on line
swing data sheet.
F-7 of the swing data sheet.
9-23
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