Tektronix 576 - Looping Compensation Adjustment

f . Set
the
Ty p
e
576
V ARIABLE COLLECTOR S UP-
PLY fully counterclockwise an d t he MAX PEAK V OLTS
switch to 15 .
g . Set the Calibration F ixture Ste p Generator Loa d s
switch to 1 Κ Collector Short .
h . Set the Ty pe 576 MAX PEAK V OLTS an d VERT-
ICAL switches as shown in Table 5-9 .
TABLE 5-9
Check Collector Supply
Peak Current
i . P osition the spot to the zero vertical and
h orizontal
graticule lines of the Ty pe 576 CRT .
j . F
or
each Ty pe 576 MAX PEAK V OLTS setting, turn
the V ARIABLE
COLLECTOR S UPPLY control clockwise
until
the p eak current shown in Table 5-9 is reache d , then
return the V ARIABLE
COLLECTOR S UPPLY control to
its fully counterclockwise p osition .
α

Turn off the Ty p
e
576 .
CAUTION
Do n ot excee
d t he rating of the collector su pp ly as
shown in Table 5-9 . R eturn the V ARIABLE COL-
LECTOR S UPPLY control to its fully counterclock-
wise p
osition as soon as the maximum current h as
been obtained .
k . Set the Ty p
e
576 Calibration
F ixture Step Generator
L oads switch to Off .
34 . Check Interlock System
.
b . Disconnect the Calibration
Fixture from the Ty pe
576 and install the Stan d ard Test F ixture
.
c . Install the universal transistor ada p ter (Tektronix P art
Νο .
013-0098-00) on the Stan d ar d Test F ixture .
d . Install the p rotective box on the Standar d Test
F
ix-
ture, close the li d and turn on the Ty p
e
576 .
TABLE 5-8
C heck Collector Su p
ply Peak Voltages
P erformance Check/Calibration-Type
576
e . Set the following Ty p e 576 controls to :
VERTICAL

1 mA
H ORIZONTAL

.5 V COLLECTOR
MAX PEAK V OLTS

15
PEAK
P
OWER WATTS

220
V ARIABLE COLLECTOR

Fully Counterclockwise
SUPPLY
Terminal
Selector

B ASE T ERM STEP
G EN
(NOR M )
f . Turn the V ARIABLE COLLECTOR S UPPLY for α
trace five d
ivisions long .
g . L ift the li d of
the p
rotective box .
h . CH E CK FOR- Νο change in the trace on the CRT
an d t he yellow and re d lights off .
i .
Set
the Ty pe 576 MAX PEAK V
OLTS switch to
the
75, 350 an d 1500 p ositions . Set the H ORIZONTAL switch
to 2 V, 10 V and 100 V, res p ectively .
j . In each p osition of the MAX PEAK V OLTS switch,
lift and close the li d of the p rotective box .
k . CHECK FOR-Re d light on and trace app earing on
the CRT when the li d is close d ; yellow light on an d no trace
when the li d is o p en .
35 . A d just L oo p ing Compensation
α . Set the following Ty p e 576 controls to :
VERTICAL

1 μ , Α
H ORIZONTAL

2 V COLLECTOR
MAX PEAK V OLTS

15
V ARIABLE COLLECTOR

Fully Clockwise
SUPPLY
L OOPING COMPENSATION

Centere d
LEFT-OFF-RIGHT
LEFT
b . CHECK FOR-Trace which is α single
loop
(see F
ig .
5-12 Α ) .
c . ADJUST-C301, L OOPING B ALANCE a d justment,
on
the
left si d
e
of
the
instrument (see
F
ig .
5-13) if the trace
h as
two loo
p s .
5-
23
H ORIZONTAL MAX PEAK V OLTS Peak Volts Tolerance
2 15 7 .5 d iv, +1 .5 d iv -0 .38 d iv 15 V, +20% ο
-5°/ ο
10 75
7 .5 d iv, +1 .5
div -0 .38 div 75
V, +20% -5%
50 350 7 .5 d iv, +1 .5 d iv -0 .38 d iv 350 V, +20% -5%
200 1500 7 .5
d iv, +1 .5 d iv -0 .38 d iv 1500 V, +20% ο -5 9 /o
VERTICAL MAX PEAK V OLTS Peak Current
20 mA 1500 10 d ivisions 20 mA
.1 Α 350 10 d ivisions 1 Α
.5 Α 75
8 d ivisions 4 Α )
2
Α 15
10 d ivisions 20 Α