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TM 9-4931-378-13&P
(14) DVM shall indicate between - 14.80 Vdc
(1) Apply power to the Test Set by setting
and - 15.20 Vdc.
circuit breakers CB1 and CB2 ON. Insure
(15) If requirements of step (14) are met pro-
that 115 Vac and 28 Vdc lamps light.
ceed to step (17). If not, proceed to step
(2) Allow the Test Set to warm up for 15
(16).
minutes, before any adjustments and
(16) Adjust the -15 Vdc adjustment potenti-
alignments are made.
ometer (figure 6-6) on power supply PS2
until DVM indicates between -14.80 Vdc
and -1 5.20 Vdc.
6-9. Special Environmental Conditions
(17) DC power supply adjustments complete.
a. All adjustments and alignments are to be per-
formed in an environment, which is controlled to
b. Adjust the oscillator amplitude and frequency cir-
the extent necessary to assure measurements of
cuits as follows:
required accuracy, giving due consideration to
(1) Set TS MON/Switch S11 (16, figure 6-5)
temperature, humidity, vibration, cleanliness and
to REF OSC.
(2) Connect DVM positive lead to TP9 (15).
other controllable factors affecting precision mea-
(3) Connect DVM negative lead to TP10
surement.
(14).
(4) Connect oscilloscope positive lead to TP9
6-10. Control Settings. The Test Set front panel controls
(15).
and indicators are illustrated in figure 6-5. Adjustment in-
(5) Connect oscilloscope negative lead to
structions shall call out controls and indicators by the fig-
TP10 (14).
ure 6-5 reference numbers.
(6) Set DVM for RMS Vac and read between
6-11. Adjustment Procedures.
6.87 Vac and 7.27 Vac RMS.
Adjust the DC power supplies as follows:
a.
( 7 ) Check for indication on oscilloscope of
Set TS MON switch S11 (16, figure 6-5)
(1)
between 380 and 420 Hz.
to 5V.
(8) If the requirements of steps (6) and (7)
Connect the DVM negative lead to TP10
(2)
are met, proceed to step (12). If not, then
(14).
proceed to step (9).
(3)
Connect DVM positive lead to TP9 (15).
(9) Adjust potentiometer R7 on the Buffer
(4)
DVM shall indicate between 4.90 Vdc
and Oscillator CCA 1A3 (figure 6-7 and
and 5.10 Vdc.
If requirements of step (4) are met, pro-
indicates between 6.87 and 7.27 Vac
(5)
ceed to step (7). If not, proceed to step
RMS.
(6).
(10) Adjust potentiometer R8 on the Buffer
Adjust +5 Vdc adjustment potentiometer
(6)
and Oscillator CCA 1A3 (figure 6-7 and
DVM indicates between 4.90 Vdc and
scope indicates a frequency is between
5.10 Vdc.
380 and 420 Hz. (See figure 5-13, wave-
Connect DVM positive lead to TP11 (11,
(7)
form 3.)
NOTE
(8)
Connect DVM negative lead to TP12 (9).
Set POWER TEST switch S12 (17) to
(9)
The voltage and frequency adjustments
L A I +15V.
on the Buffer and Oscillator CCA inter-
DVM shall indicate between 14.80 Vdc
(10)
act. After adjusting either value, recheck
and 15.20 Vdc.
the other.
(11)
If requirements of step (10) are met,
proceed to step (13). If not, proceed to
(11 ) Repeat steps (9) and (10) until satisfac-
step (12).
tory results are obtained.
(12)
Adjust the +15 Vdc adjustment potenti-
(12) Oscillator adjustments complete.
ometer (figure 6-6) on power supply PS2
Perform the peak detection circuit and resolver
c.
until DVM indicates between 14.80 Vdc
alignment as follows:
and 15.20 Vdc.
(1) Ensure circuit breakers CB1 (13, figure
(13)
Set POWER TEST switch S12 (17, figure
6-19
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