Section IV. OPERATING TEST SET
and SUPPRESSOR selector switches select the
Starting
Procedure
t e s t socket connections so that correct test volt-
Before operating the test set, perform the
ages are applied to the elements of the tube
starting procedure below to check the general
under test. For clarity, these selector switches
operation of the equipment. If the results ob-
will, in some instances, be referred to collec-
tained from the procedures in b through e b e -
tively as "the selectors". When referred to col-
low are satisfactory, the test set is ready for
lectively, they are considered in the same order
operation.
as above.
N o t e . If an abnormal indication is obtained during
b.
Setting
Controls.
the starting procedure, refer to the equipment perfor-
m a n c e checklist (par. 35) for corrective measures.
(1) Locate the type number of the tube
a. C o n n e c t t h e t e s t s e t t o a 1 1 5 - v o l t a c , 5 0 -
to be tested in the test data book (fig.
t o 1 , 0 0 0 - c y c l e p e r s e c o n d ( C P S) , p o w e r s o u r c e .
1-4).
b. S e t t h e P O W E R s w i t c h t o t h e O N p o s i -
(2) T u r n
the
FILAMENT
VOLTAGE
tion; the PILOT lamp should light.
knob to the position shown in the F i l
-
LINE
ADJ.
Ro-
c. P r e s s
pushbutton
1
column of the test data book.
tate
the
LINE
ADJUST
control
knob
until
the
Set the selectors to the letters and the
(3)
meter pointer rests over the LINE TEST mark
numbers indicated in the S e l e c t o r s
on the meter face.
column in the test data book. Be sure
- LINE ADJ.
d. R e l e a s e
pushbutton
1
the numbers indicated by the selector
e. C h e c k
the
short
test
circuit.
knobs are the same, if read from left
(1)
Set
the
left
FILAMENT
selector
at
to right, as the numbers in the test
A, the right FILAMENT selector at
data
book.
P, and the GRID, PLATE, SCREEN,
E x a m p l e : To test a tube type 6SN7, the
CATHODE,
and
SUPPRESSOR
se-
Selectors column in the test data book indi-
lectors at 0, 0, 0, 2, and 2, respectively.
cates that the selectors are to be set at
HY4-5062. Start at the left and turn the
(2)
Rotate
the
FUNCTION
SWITCH
FILAMENT (left) selector knob to H, and
through the five SHORTS positions.
the FILAMENT (right) selector knob to Y.
The
neon
SHORTS
lamp
Turn the GRID selector knob to number 4;
should glow in positions 2 and 3 of
the PLATE selector knob to number 5; the
the
FUNCTION
SWITCH
to
indicate
SCREEN selector knob to number 0; the
CATHODE selector knob to number 6; and
that the short test circuit is function-
the SUPPRESSOR selector knob to 2. The
ing properly.
sequence of letters and numbers thus se-
f. S e t t h e P O W E R s w i t c h t o t h e O F F p o s i -
lected
(HY4-5062)
is
identical
with
that
tion.
listed in the test data book. The selectors are
interconnected electrically so that two differ-
Operating Procedure
ent voltages cannot be applied to the same
The procedures below apply to single-section
tube pin at the same time. Therefore, acci-
dental shorts are avoided.
and multipurpose tubes (tubes that have more
( 4 ) Set the BIAS control to the number
than one set of elements in the same envelope).
indicated in the B i a s c o l u m n
of
the
Test each section or group of elements of a
test data book.
multipurpose tube separately. Test data for the
multipurpose tube types are listed by sections
( 5 ) Set the SHUNT control to the number
indicated in the S h u n t c o l u m n o f t h e
the test data book.
test data book. If no setting is indi-
cated, disregard this step and proceed
C a u t i o n : Do not insert a tube into a test
with the steps below.
socket until all the controls have been set in
accordance
with
the
instructions
below.
(6) Set
the
FUNCTION
SWITCH
knob
to 1.
a.
Selectors. The
FILAMENT
(left
and
right),
GRID,
PLATE,
SCREEN,
CATHODE,
( 7 ) Insert the tube to be tested in the
