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User Manual
10.6.3 Abn m
or al Test
From the MIL704 main menus as shown in Figure 10-2, scroll to the ABNORMAL AC entry using the
up and down cursor keys. Press the ENTER key to select the ABNORMAL screens. The screen will
appear as sho
wn in Figure 10-5.
The AB
NOR
MAL SCREEN h
1
. OVE
R VOLT GE
2
. UND
ER VO
3. OVER FREQUENCY
4. UNDER FREQUENCY
The above test can be selected by scrolling to
and the ENTER key to start the selected test.
OVER V
OLTAGE
This test will change the
For 400Hz and VFREQ:
180V for 50msec.
The voltage gradually decays with time to 125 volt b
V =
124.6 +
Stay at 125V for 93 seconds before returning to 115V.
For 60Hz only:
180V for 3.34msec
The Voltage gradually decays with time to 122 volt by the following equation:
V = 121.7 + 0.583/t. For 0.00334
Stay at 122V for 8 seconds before returning to 115V.
Note: Prior to the test, a voltage range change may take place if the power source is set for the low
voltage range. This will cause the EUT to loose power momentarily. If this is not acceptable, the power
source must be left in high range at all times.
The
key (backspace) will terminate the test at any time.
UNDER VOLTAGE
This test will change the output voltage for the selected phase in the following sequence:
For 400Hz and VFREQ:
0V for 7 seconds.
100V for 93 seconds.
For 60Hz only
California Instruments
Figure 10-5: Abnormal Screens
as
the following tests
A
LT
AGE
output voltage for the selected phase in the following sequence:
2.
77/t. F
or
0.05
t
6
:
the highlighted selection using the up and down key
y t
he following
.925
t
1.947
2253i / 2253iX
equation:
139
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