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the crt base clamp and rotate the tube with the
alignment ring. When the trace and the grat
icule line are in coincidence , push the tube
forward so that it rests snugly against the
graticule.
Then tighten the crt base clamp.
Recheck the alignment after tightening the
clamp to be sure it didnit move while the
clamp was being tightened.
CRT adjustment SN 5200-up
Loosen the clamp at the base of the crt
and push the crt against the graticule , then
tighten the clamp.
Now with the red knob ,
near the bottom of the clamp, rotate the crt
until the trace runs parallel to the horizontal
lines of the graticule.
7.
Adjusting PHASE A a n d B a n d setting CRT
GEOM ADJ Control
G E O M
ADJ
Control for minimum curvature of
the vertical lines at the sides of the crt.
Disconnect the jumpers.
8. Checking Vertical Tube Balance
When the VERTICAL POSITIONING Control
is in its midrange position the dots should
be between the second and fourth division line
as measured from the bottom full graticule line.
If the dots do not lie in this area then V280
and V281 should be changed until the near
b alanced condition is obtained.
9.
VERT GAIN Adjustment and Checking M A / D I V
Switch
Turn the PLA TE-SCREEN-G RID Control to
SC REEN , the RANGE DC VOLTS Control to
1 4 0 and the INDICATION Control to + DC .
O n instruments below serial number 5 1 22 turn
the MA/DIV Control to .02 while on instru
ments above serial number 5 1 21 the control
is set to . 1 .
While observing the meter, set the + DC
Controls for exactly 140 volts , then switch the
INDIC ATION Control to HTR. Now position the
dots to the bottom full graticule line. Switch
the INDICATION Control to + DC and adjust the
V E RT GAIN Control for a deflection of 1 0
divisions.
Switch back and forth between the + DC and
H T R positions of the INDICATION Control to
remove interaction in the adjustment. B e sure
Fig. 5-4.
The waveform obtained in the
240
position
of
the STEPsl
that the dots are on the bottom graticule line
S E C Control, which i s used t o adjust the C R T GEOM
ADJ
Control.
each time you switch after setting the +
DC
Set the PLATE-GRID Control to GRID, the
VOL TS/DIV Control to 1 and connect a jumper
from the P connector on the test panel to
ground.
Adjust the STEPS/FAMILY Control
for 10 vertical lines.
Adjust the PHASE A
Control for the flatest bottom on the wave
form.
Now turn the STEPS/SEC Control to
the 1 20 clockwise position and adjust the PHASE
B Control for the flatest top on the waveform.
Turn the STEPS/SEC Control to' the 240 position
and check for alternate switching, see figure
5 - 4.
Using the display obtained i n the 240 position
of the STEPS/SEC Control, adjust the CRT
position.
To check the ±3% accuracy of the MA/DIV
Contro I, set the+ DC Controls to obtain 100 volts.
B e sure to set the INDICATION Control to the
HTR position after setting the + DC voltage.
Turn the MA/DIV Control to 50 and position
the dots to the bottom full graticule line.
Connect the lk-5w resistor between the + DC
connector and ground. The dots will have moved
up two divisions . Switch the MA/DIV switch
to 20 and check to see that the dots are 5
di visions from the originally set point (the
V ER TICAL POSITIONING Control is not reset
after it is set as above). See the table below
for the other settings of the MA/DIV Control.
AA
C alibration Procedure - Type 570
5 - 5
Summary of Contents for 570
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