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  TM 11-6130-385-34
watts. Repeat this procedure as required for a
p a r t i c u l a r load. Record direct current and output
a. Equipment Setup.
v o l t a g e after circuit stabilization for 15 minutes.
On.
(1)
Load
Load, unity P. F.
(2)
Load function
3-50. Short Circuit Test
AŘ
.
(3)
Wattmeter selector
a. Equipment Setup.
(4)
Monitor selector
VDC.
On.
(1) Load
b . Test Procedure.
Load, unity P. F.
(2) Load function
(1) Set input voltage to 28 vdc and adjust power
AŘ .
(3) Wattmeter selector
for 250 w. Repeat this procedure as required on table
Vdc.
(4) Monitor selector
3-8.
b . Test Procedure.
(2) Record dc, output voltages, and frequencies
(1) Set input voltage to 26 vdc and output power
as required.
to 250 watts. Repeat this procedure as required for a
( 3 ) Compute efficiency by using the following
particular load.
f o r m u l a s and record in the appropriate block.
(2) Depress short switch and record dc and
output currents; then allow unit to foldback, which
INPUT POWER=E IN X IIN
s h o u l d be between 5 and 10 seconds.
TOTAL OUTPUT POWER =3 X 250.0
( 3 ) Release the short switch and record time
r e q u i r e d to recover to full output voltage.
EFFICIENCY = TOTAL OUTPUT POWER
(4) Allow unit to stabilize for 1 minute and
INPUT POWER
record dc, output voltages, and frequencies as
r e q u i r e d table 3-9.
3-54
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