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User Manual

164

i Series / iX Series

Sub-Tab

Description

is outside the allowable limits, a Fail indication is displayed.

Current Distortion
(%)

Displays Total Current Distortion for each phase in percent of
fundamental current. No limits are applied although the user
can set a maximum limit for this parameter if needed in the
“DO160_Distortion_Limits.ini” setting file by adding “Ithd =
n.n” in either PHASES_1 or PHASES_3 sections..

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_DO160_nnn_Hz.txt” where „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 that the voltage harmonics are used to
scale the allowable current limit values per Table 16-6.

Note:

The iX Series 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 our outside of
the range of the iX 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
“DO160_Distortion_Limits.ini” located in the CIGui32
application directory. They are set to correspond with the
limits called out in Tables 16-4 and 16-5 of the 160 Standard.

P/F

Pass or Fail indication.

A phase selection is available to the left of the graphs and table, which allows each
phase to be displayed, one at a time.