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6.6 CALIBRATION PROCEDURE.
6.6.1 GENERAL.
1. Resistance i s too high
-
R3 is open or i t s
value is too high.
2. R e s i s t a n c e is too low
-
R3 value i s too low
or C 1 i s leaky.
The few internal adjustments are factory s e t and
Set the DQ d i a l t o 20 on HIGH D s c a l e .
The
normally d o not require readjustment.
Procedures for
r e s i s t a n c e should be 79.70
0.
If n e c e s s a r y , reposition
readjustment are included here, but should be used
the DQ dial on its
until the resistance is 79.700
only when the operator is reasonably certain that
at a setting of 20.
Then check the DQ dial calibra-
readjustment is necessary.
tion a s given in Table 6-5.
T o reposition the d i a l ,
6.6.2
EQUIPMENT REQUIRED.
T h e .equipment n e c e s s a r y to perform t h e following
calibration procedures is listed in T a b l e 6-2.
6.6.3
ORTHONULL OPERATION.
With the switch in the OUT position, the CGRL
and DQ d i a l s must operate independently of e a c h other.
With the lever in the ORTHONULL position, the
CGRL d i a l must move the DQ d i a l but the DQ d i a l
must not move the CGRL dial; if performance i s dif-
ferent and DQ d i a l moves the CGRL d i a l or the CGRL
I
d i a l doesn't move the DQ d i a l , the ORTHONULL wire
tension i s incorrect.
Adjust tension by repositioning
the metal bracket under the ORTHONULL switch
(Figure 6-2).
remove the knob and loosen the two s e t screws on the
bushing.
Turn the d i a l t o the new position and re-
i n s t a l l the parts.
6.6.5 CGRL D l A L CHECK.
Keep the function switch s e t t o POWER O F F ,
but change the CGRL PARAMETER switch t o Lp.
T h i s connects the CGRL PARAMETER rheostat be-
tween ground and the BIAS terminals.
The resistance
measured should equal the setting of the CGRL d i a l in
kilohms, a s in Table
6-6.
6.6.4
DQ DIAL.
Set the function switch t o POWER O F F , the
CGRL PARAMETER switch t o C
,
and the DQ d i a l
fully counterclockwise (50 on H I G ~ D scale). Connect
a d c r e s i s t a n c e bridge between ground and either one
of the BIAS terminals a t jack
J4.
T h i s s e t u p allows
the bridge t o measure only the r e s i s t a n c e of the DQ
rheostat in s e r i e s with R3.
With the DQ d i a l fully
counterclockwise, i t s r e s i s t a n c e i s zero and the bridge
measures only the resistance of R3, which should b e
Resistance is either too high or too low:
31.90
0
+0.96
0,
after allowance for bridge lead r e s i s -
(1
) DQ
rheostat is out of tolerance.
tance. If the indication i s abnormal and:
(2) C7 or C8 is leaky.
I M D L L
U-i)
DO D l A L CALIBRATION
SERVICE AND MAINTENANCE 6-6
I M U L L U-U
CGRL D I A L CALIBRATION ADJUSTMENTS
TOLERANCE (*3%)
(OHMS)
30.94 to
32.86
slip DQ dial for exact reading
154.40
to
163.98
309.43 to
328.57
773.09 to
820.91
1544.24 to 1639.76
3094.30 to 3285.70
7730.90 to 8209.10
1 5442.40 t o 16397.60
DQ D I A L
(HIGH D)
50
20
10
5
2
1
0.5
0.2
0.1
DIAL
READING
2.6
1.6
1
.O
0.52
0.06
4.0
6.5
10.0
RESISTANCE
(OHMS)
31.90
79.70
1 59.20
319.00
797.00
1592.00
3190.00
7970.00
15920.00
RESISTANCE
I N OHMS
2600
1600
1000
520
60
4000
6500
I0000
ADJUST
CAM
SCREW
5
4
3
2
1
6
7
8
TOLERANCE
f
1 %
1 %
1
%
114 div
114 div
1
%
1 %
1
%
RANGE I N OHMS
2574 to 2626
1584to 1616
990 to 1010
515
to
525
55 to
65
3960 to 4040
6435 to 6565
9900 to 101 00
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