Hi, my name is Steven Lee. I'm a Business Development Manager at Keysight Technologies
Power and Energy Division. And in this video today, we're going to use the electronic
load function on our new N6780 series Source Measure Unit. One of the key features on our
Source Measure Units is the ability to do two-quadrant operation. What that means is
that our SMUs can act as a power supply and also an electronic load at the same time.
So, let's take a look at the setup. In the setup here, we have a simple battery. This
battery is a battery you use on a power drill but the concept applies to any type of battery,
so a laptop battery, a walkie talkie battery. I've got a set of wires running from the
battery to Channel 1 of our N6705B DC Power Analyzer. And inside Channel 1 is our N6785A
Source Measure Unit. So, let's go ahead and go to the front panel here and we'll
set up the Source Measure Unit to act as an electronic load. The first thing we're going
to do is press the Settings button. By default, the emulating mode on all SMUs as it comes
up is always two-quadrant power supply. We press the Enter button and drop down the menu.
Once we're here, we're going to select CC Load, which stands for constant current
load. At this point, the power supply is set to emulate an electronic load. Next, we jump
to the current setting. For this setup, we're going to go ahead and choose 2 amps. You'll
see a negative -2A instead of a positive 2A to indicate that current is actually going
into the power supply instead of coming out. For our current range, we're going to go
ahead and choose around four amps, which is well above what we've set the current to.
Next, we set the voltage. This is a 9.6-volt battery and we're going to go ahead and
choose a value well above that. So, let's put in 12. At this point, we're pretty much
all set to go. Let's go back to our meter view and we're going to enable the output.
So, right away you're going to see the that voltage value is dropping ever so slightly.
It's going down and it will keep going down for a really, really long time. This indicates
the discharge of the battery. If we want to speed this up, what we can do is we can set
a different, a higher current value and this will actually make things much faster. So,
instead of negative two amps, let's go ahead and push in negative four. So, once we do
that you'll notice that the value up here, the voltage value is dropping much faster
than before. When we punch in a higher and higher current value, you'll see it discharge
faster and faster. So, that's a really simple discharge function. If you want to do a deeper
analysis, what we can do is go to the Data Logger function. From an earlier setup, I've
captured the discharge profile of this battery for a few minutes and the top waveform here
is the voltage. You can see the voltage go from a high value all the way to a lower value.
The waveform down here is the current setting, and you can see it's a pretty constant value
on the current setting. So, the Data Logger is useful when you're trying to compare
your battery's actual performance to that of the manufacturer's specification. So,
this has been a video to show how to use the N6780 series SMU as an electronic load. Thank
you very much for watching. If you want to get more information, please visit www.keysight.com.
Thank you.