Hi, my name is Chuck Duey.
I'm an R&D engineer here at Keysight Technologies.
Today I will be talking about the X8712A solution with wireless connectivity, in this case using
a shield box.
Over here I have a shield box with an internal antenna that picks up the RF from our device
under test.
It also has a port so I can supply power to the device under the test.
One of the primary reasons for using a shield box is to cut out the outside interference
that might be coming in to obscure some of your measurements.
To mitigate this, you have your shield box closed during testing so you don't have any
outside RF coming into the device under test, obscuring the measurements you want to make.
The shield box antenna is connected up to one of the ports on the solution.
The other port needs to have a dummy load.
This will give you much more accurate and consistent measurements of the RF power coming
out of your device under test.
Now we will go over to the laptop, and we will take a measurement of the RF power coming
out of this to analyze when we want to trigger the solution.
Here we have the solution software.
And what we will do is do an initial trigger of this in single mode so that we can get
an idea of the RF levels coming out of the box.
So we want to be in single mode.
And we'll do an acquire.
This will give us some nice RF signals out.
You can see it's peaking right around minus seven dBm.
And it matches up with the current below.
During these transmissions, we're approximately seven milliamps.
So now what we'll want to do is actually set up a trigger on this.
The nice thing with the shield box is your background noise is down at minus 36 dBm,
very low as compared to the DUT transmission.
So it's very easy to set the threshold levels.
So we'll go down and actually change it into a triggered mode.
So we'll go triggered.
And we will want channel two, which is the RF detector.
Now, we'll want to set our trigger level at an appropriate point, somewhere between the
background noise and the peak.
So we will set it at approximately minus 20 dBm in this case, rising.
And now we will actually hit an acquire.
And now you can see the nice RF spikes matching up with the current.
The background RF is much lower than cases where you would have an external antenna just
picking it up without the shield box.
Now we'll go down here and look at the occupied time.
So for DUT transmission, we know we're peaking around minus seven dBm.
And so the background is minus 36.
So we can set our threshold right around minus 20 dBm once again and hit "Analyze."
If you take a look, approximately one percent of the time it's in transmit.
But that's using 12 percent of the total power.
So you can see during these transmissions it's using a good percentage of the power
even though it's only doing it one percent of the time.
The battery capacity for this is 240 milliamp hours.
And this is the capacity of a button cell battery.
So with that battery and this cycle, we will get approximately 471 hours of use from that
button cell battery.
So that's the setup for triggering and analyzing the device under test with wireless connectivity
using a shield box.
Thank you.
This is Chuck Duey.
We did an overview of a wireless shield box with the 8712A solution.