AMETEK Lx Series II - Manual (Page 209)

User Manual Lx / Ls Series II
205
The EUT measurement data collected for the 101 EUT performance test is divided among four
separate tabs that can be displayed by clicking on each tab at the top of the test window.
Available tabs are:
Tab Description
Parameters This tab displays parametric measurement data for all phases (three-
phase mode) or phase A only (single-phase mode). Data displayed
includes Frequency (Hz), Voltage RMS (V), Current RMS (A), Apparent
Power (VA), Inrush current (A), Power Factor and Total Current Distortion
(%). The total VA for all three phases combined is shown for three phase
EUT‟s. Any unbalance between phases is calculated and displayed next
to the total VA readout. If the unbalance exceeds the MIL-STD 704 limit
of 3%, this field will have a red background.
The current distortion is compared to the user specified ITHD limit value
shown to the right of the current distortion readout. If one of more of the
phase currents exceeds this limit, a Fail result will be displayed on the
right. The ITHD limit is set in the “MS704_Distortion_Limits.ini” text file
located in the LxGui application directory. (See paragraph 11.8.3.1)
Waveforms This tab displays at least one full cycle of both the voltage and current
waveforms. (all waveforms are for L-N voltage and phase current). In
three-phase mode, the phase to be displayed can be selected by using
the phase selection radio buttons to the left of the graph. Only one phase
is displayed at a time but all three phases are always acquired at the
same time. The test report will include data for all three phases as well.
The Settings button can be used to change display scaling and graph
colors if needed.
Curr Graph This tab displays the current harmonic spectrum in graphical form (Bar
Chart - absolute). In three-phase mode, the phase to be displayed can be
selected by using the phase selection radio buttons to the left of the
graph. Only one phase is displayed at a time but all three phases are
always acquired at the same time. The test report will include data for all
three phases as well.
The Settings button can be used to change display scaling and graph
colors if needed.
Curr Spectrum This tab displays the current harmonic spectrum in tabular form (Numeric
– absolute and relative to fundamental). In three-phase mode, the phase
to be displayed can be selected by using the phase selection radio
buttons to the left of the graph. Only one phase is displayed at a time but
all three phases are always acquired at the same time. The test report
will include data for all three phases as well.
The user can define relative limits for one or more current harmonics. If
set, the LxGui will compare actual harmonic current components against
the user defined limits and display pass or fail in the right hand column.
This data is also part of the test report.
The current harmonic limits can be set by editing the
“MS704_Distortion_Limits.ini” text file located in the LxGui application
directory. (See paragraph 11.8.3.1)
The EUT performance measurements are taken at the start of a test run and again after the
selected test or tests have been completed. If a variable frequency test group is selected, the
data will be taken at 360 Hz, 400 Hz, 600 Hz and 800 Hz. Data for each frequency is saved and
can be recalled for display if needed by using the “File Read” button in the lower left corner of the
Parameters Tab. The last measurement data taken by the LxGui program is preserved in the