AMETEK Lx Series II - Manual (Page 132)

User Manual Lx / Ls Series II
128
VOLT UNBALANCE
Standard/Group RTCA A(CF) A(NF) A(WF)
Voltage offset 6 6 6 8
Frequency 400 390/410 360/650 360/800
Standard/Group Group1 Group2 Group3
Voltage offset 6 6 9
Frequency 400 360/650 360/800
Table 8-3: Normal Voltage Unbalance
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 8-3 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
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
key (backspace) will terminate the test at any time.
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 8-4. This test will last for 2 minutes.
Note that the Airbus voltage modulation test levels are specified in peak to peak voltage instead
of Vrms. Table 4-4 shows the levels for the Airbus mode versus the DO160 and EUROCAE
modes as implemented in Lx/Ls firmware revision 0.98. 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.
Modulation
Frequency (Hz)
DO160 / EUROCAE Modulation
Frequency (Hz)
AIRBUS
Volt RMS Volt RMS
1 0.18 1 0.5
1.7 0.18 1.7 0.5
10 1.24 10 3.5
25 1.24 25 3.5
70 0.18 70 0.5
100 0.18 100 0.5
200 0.18 N/A N/A
Table 8-4: Airbus mode voltage modulation.
Note: Voltage modulation levels change linearly from frequency 1.7Hz to 10Hz and again
from 25Hz to 75Hz. See Figure 8-4.