TM 11-4920-292-15
4. E1 CHECK-E2 CHECK: OFF.
(19) Set the HEADING SELECTOR
5. ∆180 MINUTES and polarity to
switch to 270 DEGREES. Alternately syn-
value on line D-3 of swing data sheet.
chronize the compass system and adjust the
6. ∆270 MINUTES and polarity to
compensator E-W screw to remove one-half the
value on line D-4 of swing data sheet.
initial error. Record the error in table F1 of the
7. MODE SELECTOR: IND.
swing data sheet.
8. HEADING SELECTOR: 0 DE-
(20) Set the HEADING SELECTOR
GREES.
switch to 0, 90, 180, and 270 DEGREES. Syn-
9. FV SELECT:
chronize the compass system at each heading
a. For ML-1: 1.
and record the ERROR readout indications in
b. For DT-309/AJN and T-611/
table F1 of the swing data sheet.
ASN: 2.
(21) The error at 0 shall equal the error
10. READOUT SELECT: 0.
at 180 (N-S) within 12 minutes. The error
11. POWER ON-POWER OFF:
at 90 shall equal error at 2700 (E-W) within
12 minutes. If necessary, repeat compensation
POWER ON.
beginning with (15) above,
(e) Set the compass swinging switch on
the compass system amplifier power supply to
(22) Set the HEADING SELECTOR
the up position.
switch in 150 increments. Synchronize the com-
pass system at each heading and record the
(f) Rotate the HEADING SELECTOR
ERROR readout indications in table F2 of the
switch in 15 increments and observe the head-
swing data sheet.
ing indicator in the digital controller. Its opera-
tion shall be to follow the heading change and
NOTE
stop with a response characteristic of damped
Allow sufficient time for slaving signal
oscillations. If it does not, adjust the compass
to reach a null after synchronizing the
system fast swing gain (amplifier power supply,
system,
Sperry part No. 2589226-1 only).
(23) Set the POWER ON-POWER OFF
switch to POWER OFF.
NOTE
(24) Remove power to the compass system.
To adjust the fast swing gain, rotate
variable resistor 1R16, below the
(25) Remove all adapter cables and return
handle on the amplifier power supply
the system to its original configuration.
front panel, fully counterclockwise.
g. Perform one-cycle, index, transmission,
Rotate 1R16 clockwise until a 15
and system error compensation for reference
heading change causes a continued
No. 5 as follows:
oscillation in the digital controller
(1) Set up the equipment and the com-
heading indicator; then, rotate 1R16
pass system as follows:
counterclockwise until the oscillations
(a) Connect the compass calibrator to
stop. Check to see that the desired
the aircraft compass system in accordance with
operation with damped oscillation has
been achieved.
(b) Set the compass system remote mag-
(2) Determine magnetic field changes in
netic compensator controls as shown in figure
the area as follows:
(a) Set the control console switches as
(c) Apply power to compass system.
follows :
(d) Set the control console switches as
1. MODE SELECTOR: MON.
follows :
2. HEADING SELECTOR: 0
1. E1 NORM.-E1 REV. : E1 NORM.
GREES.
2. E2 NORM-E2 REV.: E2 NORM.
3. READOUT SELECT: F.V.
3. AREA COMP to value on line A-6
of swing data sheet.
(b) Adjust the VOLTS ADJUST
9-24
Previous Page
