Reproducing DC Power Transients, Using an N6705B DC Power Analyzer to Create Transients

Reproducing DC Power Transients, Using an N6705B DC Power Analyzer to Create Transients


My name’s Neil Forcier. I’m an application
engineer with Agilent Technologies, and in
this video I’m going to demonstrate how
easy it is to generate a power supply transient
with a modern high-performance power supply.
What is a power supply transient? A power
supply transient is any unintended variation
in the power supply’s output voltage or
current level. Some example causes of power
supply transients include a sudden change
in the load connected to the power supply,
such as when you turn on a car engine or start
up an aircraft engine, or an interrupt in
the power being supplied to the load, such
as when you have a handheld device you drop
and the battery momentarily loses contact.
Now, in the past, to generate or to simulate
a power supply transient required multiple
instruments and a complex set up. Today, we
can do it with just one instrument: a modern
high-performance power supply. So in this
video, I’m going to demonstrate two example
power supply transient waveforms using Agilent’s
N6705B DC power analyzer. The DC power analyzer
has three features – three key features
that make it great for simulating power supply
transients. The first is it has built-in arbitrary
waveform generation capabilities. The second
is it has output digitizers for capturing
its output voltage and current so you can
see the waveform that was generated.
And then finally, modern power supplies like
the DC power analyzer have high output bandwidth
compared to power supplies of the past. So
let’s look at our first example power supply
transient waveform. So here we see a built-in
waveform for the N6705B DC power analyzer
– a trapezoid waveform. So I’m going
to use this built-in waveform to generate
a power supply interrupt from the DO-160F
avionics test manual. Here you can see I typed
in the voltage levels as well as the rise
and fall time levels for the power supply
interrupt. I’m now going to the scope view
and we can see the DC power analyzer’s output
digitizer captured the power supply transient
– the interrupt that I had just generated.
For a second example transient, we captured
the engine turn on of a car using an oscilloscope.
We then imported the waveform onto the DC
power analyzer. Here we can see the DC power
analyzer recreated the waveform on its output,
and we captured it once again using the DC
power analyzer’s output voltage digitizers.
In this video, we looked at how easy it is
to generate a power supply transient or to
simulate a power supply transient with a modern
high-performance power supply.
In the first example, we used a built-in trapezoid
waveform inside the DC power analyzer to
create a power supply interrupt. For the second
example, we captured the waveform using an
oscilloscope from a car engine turn on, transferred
it to the DC power analyzer and recreated
it. Thanks for watching.

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