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User Manual
VOLT UNBALANCE
Standard/Group
Voltage offset
Frequency
Standard/Group
Voltage offset
Frequency
This test will change the output voltage for phase A and B to 122V and phase C to a voltage lower by
a value specified by an offset. Refer to Table 9-3 for the offset value and the Frequency. The test will
repeat with the same frequency and phase A and B volt is set to 100V and phase C set to a higher
voltage specified by the offset value. The test will last 30 minutes. The test will be repeated for a
second Frequency if applicable. The test can be terminated at any time.
The BACK key will terminate the test at any time.
WAVEFORM DISTORTION
This test will generate a 5% THD voltage distortion on the output voltage waveform at the nominal
voltage set. (115 V or 230 V) A clipped sine wave generates the required distortion. The test will last
for 30 minutes. The
VOLTAGE MODULATION
This test requires a numeric value entry equal to the modulation rate in Hz. This entry value must be
between 1 Hz and 200 Hz. The amplitude modulation is calculated based on the modulation rate as
defined in Figure 9-4. This test will last for 2 minutes.
Note that the Airbus
Vrms. Table 9-4 shows the levels for the Airbus mode versus the DO160 and EUROCAE modes as
implemented in the DO160 firmware. The actual requirement for Airbus ABD0100.8 is now specified in
Vpeak peak instead of Vrms so the Airbus mode should not be used. Use the DO160 or EURO/CAE
mode instead or use the –ABD option (See Section 11).
Modulation
Frequency (Hz)
1
1.7
10
25
70
100
200
Note: Voltage modulation levels change linearly from frequency 1.7Hz to 10Hz and again from
25Hz to 75Hz. See Figure 9-4.
California Instruments
RTCA
6
400
Group1
6
400
Table 9-3: Normal Voltage Unbalance
key (backspace) will terminate the test at any time.
voltage modulation test levels are specified in peak to
DO160 / EUROCAE
Volt RMS
0.18
0.18
1.24
1.24
0.18
0.18
0.18
Table 9-4: Airbus mode voltage modulation.
A(CF)
A(NF)
6
6
390/410
360/650
Group2
Group3
6
9
360/650
360/800
Modulation
Frequency (Hz)
1
1.7
10
25
70
100
N/A
2253i / 2253iX
A(WF)
8
360/800
peak voltage instead of
AIRBUS
Volt RMS
0.5
0.5
3.5
3.5
0.5
0.5
N/A
116
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