Hi. My name is Bob Zolo of Agilent Technologies. Today I’d like to demonstrate to you the
Agilent N6705B DC Power Analyzer. The DC Power Analyzer boosts the productivity of the R&D
engineer by integrating into a single package multiple instrument functions. So for example
within this one instrument you have up to four DC power supply outputs and these are
fully programmable outputs. You have a voltmeter, ammeter, oscilloscope, arbitrary waveform
generator, and data logger. Today during this demonstration, I’ll be using two of the
supply outputs and the data logger function. The device under test that I’ll be testing
today is this CD-ROM drive out of a personal computer. What I’m going to be doing is
looking at how much power it draws by monitoring the current flowing into the device under test.
Now it requires two different supply voltages. Channel 1 will be programmed to
12 volts and supply the power to the motor that opens and closes the drive door as well as
spins the desk and Channel 2 will be programmed to 5 volts and that will be powering the 5-volt logic.
And we’ll be able to see what happens as we open and close the drive door and we
can see the motor current as well as the 5-volt logic current. Now the first thing that I
want to do is I need to set the outputs to the correct voltages. I’ve done that ahead
of time, again Channel 1 set to 12 volts and Channel 2 set to 5 volts. So in order to test it,
I have to turn it on so I’ll hit the All On button. Now the All On button allows
me to turn all four outputs on simultaneously, so I’ll go ahead and do that and you can
see all the outputs that come on. Now this is a convenience feature because if you’re
trying to turn four power supply outputs on simultaneously, you don’t have to hit four
buttons to do that and when you hit the All On button, it’s guaranteed that they all
come on at the same time. Another capability associated with the All On button is the ability
to delay or sequence the outputs. So if you have a device under test like an FPGA or something
that needs to have its core turned on before its auxiliary functions, you can program a
delay time between the channels so that they come up in the proper order. But in this case,
we just need them to come on at the same time and power up the device under test. Okay,
so I’m all powered up and running but what I really want to do is look at current versus
time using the data logger as we open and close the drive door. So let me start the
data logger. I have to push the button that says Data Logger and now I get a screen,
a grid that looks like an oscilloscope and there are two traces on it. There’s a green trace here,
which is the 5-volt logic, the current flowing into the 5-volt logic, and the yellow trace,
which is the current flowing into the 12 volts driving the motor. So when I hit
the Run/Stop button, that will start the data logger and now you can see the data’s flowing.
I’ve got the data logger set to 30 seconds. It can actually go for much longer than 30
seconds but for purposes of this demonstration, I only have it set for 30 seconds. Now as
I operate the drive door and I open it, you can see the current on the 12-volt line as
the door opens, and if I hit the Close button, you can see the current on the 12-volt line
as the door closes, but you can also see some current on the 5-volt line and the current
there is actually the current being drawn by the 5-volt logic as it looks for the disc
in the drive. There is no disc in here but it is looking for one. Okay, so 30 seconds
is up. It saved the file and now you can see the waveforms. Now once I have this data collected,
I can do different things with it. I can save this picture as a bitmap and I can import
it into a report or I can export the data as a CSV file and then analyze it with some
other software or I can interact with it directly on the screen of the instrument. By pushing
the Data Logger button again I get some markers and I can go ahead and use the markers and
take measurements off of the Data Logger. Okay, so I want to run this one more time
and I want to try something as I’m running it. So, in this case as it’s running again,
a 30-second data log, I can open the door and there’s the normal door operation.
I can close the door. There’s the normal close door operation. But this time as the door
opens I’m going to hold it back as if there’s something jamming the door and I can actually
measure the current, which is the stall current on the 12-volt line that drives the motor.
So in this case I’m able to look at the current and understand what happens when some
kind of a fault condition occurs. Therefore this allows me not only to analyze normal
operation but analyze abnormal operation or error conditions. So that was a quick demonstration
of how you can use the DC analyzer to power a device under test and a data logger to make
measurements on the device under test. Thank you.