point (mounting screw) on the tube tester
29. Plate Voltage Test
chassis.
(A, fig. 21)
e. Set the ON-OFF switch to the ON position.
a. Set the PLATE switch to position 5.
f. Adjust the SCREEN fine control, and set
b. Depress the PRESS TO TEST P4 switch
the PLATE-SCREEN RANGE switch to read
to its locked position.
its corresponding voltage on the SCREEN
c. Set the GM-SIGNAL RANGE switch to
VOLTS meter as follows:
position A and all other switches and controls
to their neutral or OFF position (vertical posi-
Voltage
PLATE-SCREEN
RANGE.
switch
position
tion for switches, extreme counterclockwise
G
225
position for controls).
H
180
J
135
d. Connect the AN/URM105 between pin 5
K
180
of the OCTAL tube test socket and a ground test
L
135
point (mounting screw) on the tube tester.
M
90
e. Set the ON-OFF switch to the ON position.
N
90
P
45
f. Adjust the PLATE fine control, and set
the PLATE-SCREEN RANGE switch to read
g. The voltages measured on the AN/URM
its corresponding voltage on the PLATE meter
105 will be equal to the voltages indicated on the
as follows:
SCREEN VOLTS meter &5 volts error at each
point.
PLATE-SCREEN RANGE switch position
Voltage
G
250
31. Signal Voltage Test
H
250
(A, fig. 22)
J
250
K
a. Set the PLATE-SCREEN RANGE switch
125
L
125
to position S.
M
125
b. Set the GM-SIGNAL RANGE switch to
N
90
position A.
O
60
62.5
c. Set the PLATE fine control fully clockwise.
Q
R
35 ac
d. Set all other switches and controls to their
S
20 ac
neutral or OFF position (vertical position for
switches, extreme counterclockwise position for
controls ).
g. The voltages measured on the AN/URM
e. Set the ON-OFF switch to the ON position.
105 will be equal to the voltages indicated on the
PLATE meter 2.5 percent error at each dc
f. Adjust the SIGNAL-V.R. fine control so
point, and 5 percent error at each ac point.
that the SIGNAL meter indicator deflects to the
redline.
30. Screen Voltage Test
g. Set the BIAS RANGE switch to position 10.
(B, fig. 21)
h. Set the GRID switch to position 5.
i. Adjust the BIAS fine control so that the
a. Set the SCREEN switch to position 4.
GRID BIAS VOLTS meter indicates 5 volts.
b. Depress the PRESS TO TEST P4 switch
j. Set the ON-OFF switch to the OFF position.
to its locked position.
k. Connect the ME-30A/U between pin 5 of
c. Set the PLATE fine control in position as
the OCTAL tube test socket and a ground test
indicated in paragraph 29 f, the GM-SIGNAL
point (mounting screw ) on the tube tester.
RANGE switch to position A, and all other
switches and controls to their neutral or OFF
i. Set the ON-OFF switch to the ON position.
position (vertical position for switches, extreme
m. Set the GM-SIGNAL RANGE switch to
counterclockwise position for controls).
position A, B, C, D, or E to read .25, .25, .25, .5,
d. Connect the AN/URM105 between pin 4
or 2.5 volts ac, respectively. The ME30A/U
of the OCTAL tube test socket and a ground test
indicates 5 percent error at each point.
AGO 1428A
37
