Tektronix 576 - Page 238

ΤΥΡΕ 576

Pap 1 of 4
Section 3

Circuit D escription
Page 3-3

Interlock
ADD : to the
end
of t he
second paragraph :
TheCOLLECTOR
S
UPPLYVOLTAGEDISABLED
light may a lso be turned on if
thermal c utoutΤΚ346 becomes open . ΤΚ 346 opens whenever the internal
h eat in the instrument becomes h ot enough to
damage
the collector
supply o r the r
eadout .
Page 3-4

Fig . 3-3
CHANGE : Callout in picture
in Fig . 3-3 which reads 1F20 (75 and 350 Bypass)
to r ead
:
P age 3-5

Fig . 3-4
ADD : The
l
ogic
symbols u sed to describe the operation
o f
t
he
clock circuit are
1F2 (75
to 350 B ypass)
TEXT CORRECTION
Σν <g-ti τ e Input

NOR .

Inverter
AND

-
C4/369
(Revised)