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Page Title:
Short-Circuit Current Adjustment Test |
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  h. Repeat the instructions given in a
switch to 300 MA. Adjust R21 for a 30.5- to
through g above with the variable voltage trans-
30.7-volt reading on the voltmeter.
former first set at 103 volts, and then set at
127volts.
Set the PP-3514/U SHORT CIRCUIT CUR-
i. Adjust the output of the variable voltage
RENT MA switch to the 225 position, connect a
transformer to 115 volts.
roper wire across the output terminals, and
j. Adjust the PP-3514/U VOLTAGE AD-
bate the VOLTAGE ADJUST control fully
JUST control for a 30-volt output, and close
clockwise. Adjust R8 for a 230-ma reading on
the series TOGGLE SWITCH.
the PP-3514/U panel meter.
k. Adjust the variable voltage transformer
from 103 volts to 127 volts. The output voltage
of the PP-3514/U should not vary more than
Before performing this procedure, adjust the
0.3 percent as indicated on the ME-26B/U. At
panel meter mechanical zero as specified in
voltage below 15 volts, regulation should be with-
in ± 15 millivolts
necting multimeter TS-352/U across the PP-
l. Set the ME-30A/U to the 0.001 range and
3514/U output terminals in series with a 1,000-
measure the ripple. The ripple plus noise
ohm resistor. Rotate the PP-3514/U VOLT.
should not exceed 0.15 millivolt.
AGE ADJUST control until the TS-352/U in-
dicates 10 ma. Set the METER RANGE
6-9. Ac Internal Impedance Check
switch to 10 MA and adjust R25 until the PP-
3514/U panel meter indicates 10 ma.
Connect the equipment as shown in figure
6-2. This check is made by applying 10 ma al-
ternating current through the PP-3514/U and
Connect the equipment as shown in f igure
measuring the voltage drop across the output
terminals.
a. Set the ME-26B/ U to the 30-volt range.
a. Set the controls on the equipment as
b. Adjust the variable voltage transformer
shown in figure 6-2.
for a 115+volt output
b. Close the series TOGGLE SWITCH and
c. Adjust the PP-3514/U VOLTAGE AD-
adjust the PP3514/U VOLTAGE ADJUST con-
JUST control for a 30-volt output.
trol until the PP-3514/U panel meter indicates
d. Adjust the 1,500-ohm potentiometer until
30 volts.
battery potential is 30 volts. The battery po-
c. Adjust audio oscillator 200CD until ME-
tential is 30 volts when the ME-26B/U indi-
30A/U No. 2 indicates 10 volts. This is equal
cates 0 volt.
to 10 ma.
e. Set the ME-26B/U to the 1-volt range and
d. Observe the meter indication of ME-30C/
adjust the 1,500-ohm potentiometer until the
U No. 1.
ME-26B/U indicates approximately half scale.
e. Calculate the internal impedance, using
f. Close the toggle switch; this places a 200-
the formula:
ohm load across the output terminals of the
PP-3514/U. The voltage as indicated on the
z
ME-26B/U should not change more than 0.3
int is the internal impedance, E#1 is the
percent at the 30-volt output from the PP-3514/
voltage indicated on ME-30C/U No. 1, and Iac
U.
is the 10 volts (equal to 10 ma) indicated on
g. Repeat the procedures given in a through
ME-30C/U No. 2. The internal impedance
f above at 20 volts and 10 volts. Close one
should be less than 0.2 ohm.
toggle switch in parallel with one 66.7-ohm re-
sistor for the 20-volt check, and close the oth-
er toggle switch (both toggle switches closed)
for the 10-volt check.
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