Hi. My name is David Tu. I’m a test engineer at Agilent Technologies, and in our video today,
I’m going to show you how to digitize using our 34411 DMM. The 34411 has a few additional
features that are not available in our other DMMs. It’s able to do 50,000 readings per
second. Has 1M of internal memory. It can do level triggering, as well as pre and
post triggering. So in our video today, we’re going to show you a bunch of those features.
So, what I have on my bench here is I have a function generator that’s connected to
the DMM. The function generator is outputting a waveform right now. And just a brief description
of the waveform, it has about one second of noise. Then it’s got a two volt pulse here.
A little bit of a delay. And then I’m following up with a two volt peak to peak sine wave.
So that’s currently being outputted, so what we’re going to do is we’re going
to digitize that signal using this DMM and visualize that using Excel. So in order to
do that, I’m just going to show you how to get that data using our web user interface
that’s built into the 34411.
So, first thing I want to do is I want to get the IP address of the 34411, and
I see here that the IP address is 169.254.4.10. So, I’m going to bring that up in a web browser,
and now I’m already talking to the DMM. So, I’m just going to click on
Web Browser Control and allow full control here, so that allows me to control the DMM
using this interface. Then I’m going to click on this button that says Control DMM
and open up the Control DMM window.
So, the DMM settings right now are just the default state, so we’re going to go through
the setup in order to digitize a signal. So, just in the measurement settings here,
we have DC volts, 10M input resistance. We’re actually going to set the range to be manual.
Since we have a two volt signal on there, I’m going to set the range to be a 10V range.
Autozero Off, Peak Measurement Off. And then in the Integration time you’ll
see a bunch of integration times. In the 34410, you won’t be able to see that. But with
the 34411, we have a bunch of fast integration times, so in this case I’m going to put
.002 PLC which allows us to sample pretty fast, but have fairly good accuracy.
And then here in the trigger settings is actually where I’m going to set up the digitizing
settings for the DMM. I’m going to set my Trigger Source to Internal and Positive Slope.
What I want to try to do off of this waveform, I’m going to trigger off of this pulse and
I want to maybe set it to be about 1.5V, so let’s do that here by setting the Trigger
Level to 1.5V. And I want zero Trigger Delay. And say for the Sample Count, let’s
go ahead and just take 10,000 samples. And from that Sample Count, I actually want to
get a little bit of the noise here, so since I have about one second of noise here, that’s
about 2,000 samples. And my Sample Interval, since I have a five second waveform,
I’m going to divide five seconds by 10,000 and get 500 microseconds. The Voltmeter Complete
I’m not going to care about, but I’ll set that to Positive.
So, I’m going to apply that to the DMM, and that’s basically all the setup that
you need to digitize. So, in order to visualize the data, I’m going to say View Data
and then start my measurement.
You’ll see here in the View Data window, I’ve got 10,000 readings,
so let’s go ahead and read out our 10,000 readings and get the data.
So, you’ll see here in this window we have the data, but it really doesn’t visually show
us what we’re trying to show, so I’m going to Ctrl A to select all the readings, and
Ctrl C to copy them, and then go into my Excel. And I’ve already got a couple of charts
set up to visualize the data, and I place that data in there with Ctrl V,
and here you’ll see that this waveform matches pretty close what I have outputting from my arb.
So, I’ve got about a second of noise, the pulse signal, the delay, and then our sine wave.
And then in this little window up here, I’m just showing you that I did have a nice clean
sine wave coming out of there.
So, that’s all there is to digitizing with the 34411. I don’t always digitize, but
when I do, I use a DMM. Thank you very much.