Advanced Features: LVTGO-VBS: Low Voltage Battery Simulator For EMC Standards & Robustness Testing

Hello my name is David Shaw. I’m here to
talk about the LVTGO-VBS, low voltage EMC standards and robustness test
system. I’m here today to talk about some more advanced features of the system; for
example creating CSV waveforms and delivering them to devices under test,
and also a little about how to log and analyse data. Let’s get started. the LVTGO system comes pre-programmed with a number of default waveform types that
simulate common supply disturbances. These can be found on the opening screen
of the LV-Test suite. Many of these waveform types are divided into segments,
whose voltages and durations can be randomized around values you can
configure. The system can then deliver many thousands of slightly different
waveforms to a device under test in a repeatable manner. However, if you would
rather deliver a bespoke voltage profile this is easily achieved. To do so, simply
select captured waveforms from the main menu of the LV-Test suite. From here we’ll
see a screen displaying live output set point. Of course we’re not delivering the
waveform yet so the output is a steady 12 volts. To select a custom
waveform to play, we need to hit captured import. There now follows a three-stage
process. First, your CSV file is uploaded into LV-Test. Next, its re-sampled so it’s
compatible with the LVTGO. Finally it’s downloaded to the LVTGO where it’s
stored in memory, ready to be delivered. Let’s see how this is done. If we click
import CSV files, we can select from a few pre-prepared data sets. These are
actually starting waveforms from production vehicles. If we open one of
these files up, you can see that they consist of simple pairs of values. Once
we’ve imported our custom waveform, we can move to the captured resample screen.
Here we’ll be able to select our waveform on the left, click resample, and
in a few moments a resampled file will be generated.
Finally, we move to the captured transfer screen. If we click connect and sync the
software shows all waveforms currently held in the LVTGO’s memory. Then, if we
select our sampled waveform and ‘store’, our waveform will be transferred to the
LVTGO hardware, ready for playback. Having successfully loaded our captured
waveform into memory we can now return to the waveform main screen. Under
waveform number, we just need to enter the number corresponding to our new
waveforms position in memory, click Play and our captured waveform will start. You
should note that it’s also possible to see the voltage and current actually
being generated. Should you wish to log a waveform being delivered to a device
under test, that’s also possible. To show you how this is done, we’ll start to
deliver a random cranking waveform to our device. On the right hand side of the
waveform main screen, you’ll notice the data logging option. We’ll select ‘wave
only’ for now and play our waveform. As you can see, logging begins automatically
and ends once playback is cancelled. Once playback has ended, we can click ‘save
clear log data’ to save our profile. To analyse this data, we need to select the
LV-Test tab at the base of the screen. Here we’ll find our file under related
documents. If we open this up, we can see a graph of the waveform we delivered. We
can manipulate this data here, or if it’s more convenient, export it as an image
or CSV file. Aan important final feature to touch upon is triggering. If you’re
looking to automate your testing, the LV-Test suite can be triggered by a CAN bus or a digital signal, or can send these triggers on completion of a
particular activity, such as reaching a certain time step. Settings for
triggering can be found within the triggering screen of the LV-Test suite,
both for output and import triggering. More advanced test automation can be
configured to using COM interfaces. That’s it for now. If you have any other
questions about the LVTGO, why not get in touch with us via our inquiries
address, [email protected], or give us a call we hope to hear from you soon.

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