Products > Test Equipment
PRP1 - Low cost 2GHz power rail probe
tszaboo:
--- Quote from: Martin72 on September 30, 2024, 09:28:39 pm ---What would it cost?
Since reading this article, I have become very interested in it:
https://www.siglenteu.com/power-integrity-measurement-solution/
--- End quote ---
250 EUR + Paypal and shipping fees.
Siglent is very right about those measurements. Switching noise can and will couple into passive probes. You are trying to measure ripple on a power supply rail, but those spikes make it impossible, since they superimpose and make a few millivolt ripple into hundreds of millivolts of noise spikes. Often times it's so short and it lines up with your trigger, you don't even see it on the scope screen. Plus, thats not what's on your board, it's something that couples into your 1MOhm/10MOhm passive probe as EMI.
Now, power rail probes that are made for your scope are great, and if you (your company) can afford one, buy that. It shows the DC component, tells you if the probe is in overload. Much better for reporting and design verification. And they have cable compensation, or DC calibration. But they are very expensive. The PRP1 won't show you the DC offset on the screen, or tell you if it's in overload. So you have to be aware of the limitations. On the other hand, you can see from the scope screengrabs that I posted, it's less noisy than a x10 probe, and doesn't show the EMI switching noise.
tszaboo:
I've finally had time to finish the remaining test, the second VNA measurements with a higher quality VNA (Megiq). I could do a sweep between 400MHz and 4GHz on 3600 points, so every MHz.
S11, SWR and others are just informative, this is not a pure 50 Ohm system since the source impedance is 0 Ohm and the load is 50 Ohm, and I have parts in series. But it's still tells a bit about the system performance, so I included it.
More important is the gain VS frequency. Nominal gain is 1.3:1 or -2dB. Normally scope manufacturers define the bandwidth of a probe or a scope at the -3dB point compared to the nominal gain. The -1 dB point is 2.7GHz for this probe, and the -3dB is over 4GHz, meaning that the probe fulfills the 2GHz design requirement. I doubt that there are many people with 2GHz+
scopes that would be interested in buying this.
The choice of cabling and the scope's internal 50 Ohm (or external 50 Ohm) will be the limiting factor in all cases.
tszaboo:
Cables arrived, packaging sample arrived, and it's a nice one.
I only have to order a bit more from the packaging and I'll be ready to ship out the first batch.
Martin72:
Looks really good :-+
tszaboo:
So after some family stuff and then some sickness, I'm ready to continue.
First batch is almost ready. I can send them out this weekend maybe early next week.
I'm accepting orders for the first batch now. PM me.
Price is 250 EUR + payment and shipping fee. Shipping is calculated as DHL smallest package from Netherlands.
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