AMETEK Compact i/iX Series Software Manual - Manual (Page 18)

User Manual – Rev H California Instruments
18 Avionics Software
Sub-Tab Description
power readings.
Inrush Current (A) Displays peak current detected per phase in Amps since last
measurement was taken.
Power Factor Displays power factor for each phase. If one or more phases
is outside the allowable limits, a Fail indication is displayed.
Current Distortion
(%) Displays Total Current Distortion for each phase in percent of
fundamental current. Limits are applied when the
specification calls them out, otherwise the user can set the
limits by modifying the limits text file.
The bottom half of the Parameters tab contains user controls and a text entry field
for entering observations regarding the EUT operation.
Test Frequency
Dropdown control The frequency selection drop down control is active only for
Variable Frequency tables and can be used to set the
frequency at which data from the EUT is to be acquired. For
all other modes, it is fixed to either 400 Hz or DC.
Acquire Data at all
frequencies This button causes data to be acquired at all frequencies
available in the Test Frequency Dropdown control.
For all constant frequency, this button functions like the
Update Meas. Button located above the sub tabs.
Abort Meas. This button aborts measurements in progress. In case of
Variable Frequency Tables, acquiring data at all 12 frequency
settings can take a long time. This button allows this process
to be aborted.
Read Meas. Data
from File This button reads measurement data from disk. Each time
measurement data is acquired by the GUI, it is saved to an
ASCII text file. A separate file is used for each frequency or
DC setting. To recall data taken at a specific frequency
setting, select the desired frequency using the Test
Frequency Dropdown control before clicking on this button.
Note that all measurement data files are saved in the Reports
subdirectory of the GUI application directory using file name
convention “MeasData_option_nnn_Hz.txt” where „option‟ is
the avionics option and „nnn‟ is the frequency setting or DC.
Waveforms This tab displays the voltage and current waveform (time domain) for each phase.
The sample rate is automatically set to display about 20 msec of time.
Cur Graph This tab displays the Current harmonics in a bar graph format. Up to 50 harmonics
are displayed.
Cur Spectrum This tab displays the same current harmonics as the Current Graph tab except in a
tabular format. Data is shown in both absolute and relative from (percent of
fundamental current). A limit table is applied and a pass or fail indication is shown
in the last column. Values that exceed the allowable limits are shown with a red
background in the Pass/Fail column.
Note: Usually, the power source measurement bandwidth is less than required to
make full compliance current harmonics measurements. This feature is provided for
pre-compliance assessment purposes only. A high bandwidth power analyzer with a
100 KHz sampling rate or better is generally required. Harmonics that are outside of
the range of the measurement system are indicated with a “BWL” (bandwidth
limited) label instead of a readout.
No. Harmonic number, 1 through 40
Freq (Hz) Frequency of harmonic in Hz.
Curr (A) Absolute current (rms) in Amps.
% Fund. Relative current in percent of the fundamental current (I1).
Limit Allowable current harmonic limits per individual EUT
specifications. These limits are located in the file named
“option_Distortion_Limits.ini” where „option‟ is the avionics
option, located in the Gui application directory. They are set to
correspond with the limits called out in the applicable
standard. If there are no limits called out in the standard,
these are set to 0 and no limits will be implemented. All limits