TB 9-6625-1014-24
(15) Connect lead from resistance bridge UNKNOWN 1 terminal to center terminal
of R24 and connect lead from resistance bridge UNKNOWN 2 terminal to the center
terminal of R21 (fig. 1).
(16) Adjust resistance bridge for a null indication on dc detector. If resistance bridge
does not indicate between 993 and 1013 Ω, perform b (8) through (10) below.
(17) Replace shorting strap removed in (2) above and connect TI to ac source and energize.
b. Adjustments
(1) Remove bridge chassis from case.
(2) Loosen set screws in collar of contact and collar assembly for R25 (fig. 1).
(3) Rotate contact arm along the winding until resistance bridge indicates a
null of 10,030 Ω.
(4) Tighten the two set screws in contact and collar assembly of R25 (fig. 1) (R).
(5) Loosen the two set screws in the collar of contact and collar assembly for
R24 (fig. 1)
(6) Rotate contact arm along winding until resistance bridge indicates a
null of 66 Ω.
(7) Tighten the two set screws in the contact and collar assembly of R24 (fig. 1) (R).
(8) Loosen the two set screws in the collar of contact and collar assembly for
R21 (fig. 1)
(9) Rotate contact arm along resistance winding until resistance bridge indicates a
null of 1003 Ω.
(10) Tighten the two screws in contact and collar assembly of R21 (fig. 1) (R).
(11) Replace bridge chassis in case.
11. Oscillator
a. Performance Check
(1) Connect equipment as shown in figure 2.
(2) Position controls as listed in (a) through (h) below:
CIRCUIT SELECTOR switch to L-D-QX-100H.
(a)
LRC DIAL MULTIPLIER switch to L-100H.
(b)
D-Q dial (outer, black scale) to 10.
(c)
DETECTOR switch to INTERNAL.
(d)
GENERATOR switch to INTERNAL.
(e)
OSC GAIN control fully cw.
(f)
Shorting bar connected to EXT D-Q binding posts.
(g)
Adjust LRC outer dial off of 0.
(h)
(3) Frequency counter will indicate between 990 and 1010 Hz, and multimeter will
indicate at least 12 V ac.