Products > Test Equipment

PRP1 - Low cost 2GHz power rail probe

<< < (3/13) > >>

JPortici:

--- Quote from: tszaboo on August 23, 2024, 10:49:12 am ---
--- Quote from: tautech on August 23, 2024, 10:05:33 am ---Nice, OP image needs resizing....good you've done it.

Dunno what it is but we have one coming soon too, a 4 GHz version.

Wanna know the specs of what you're up against ?

--- End quote ---
Thanks. I'm eager to find out.
There are many benefits of using a factory built probe, it tells you on the screen what the voltage you are looking at, and with the active probe it's a better interface.
Still, I hope people with low-end scopes or budget will be able to use a probe like this.

--- End quote ---

and one may wonder if there were APIs for the probe interface. Maybe siglent would be prone to provide a generic class of devices (I2C device id = 0xNN means power line probe, probe reports calibration factors in such format and responds to command in such other format)
Ah, that would be indeed wonderful.

Now back to lurking

nctnico:
Why not use a push-button electronic potmeter? I have been tinkering with the idea to add an offset to my HF differential probe and I drifted towards using an electronic potmeter. The advantage is having less noise (no wiper noise), a fine and more stable adjustment and no mechanical components.

tszaboo:

--- Quote from: JPortici on August 23, 2024, 03:47:10 pm ---and one may wonder if there were APIs for the probe interface. Maybe siglent would be prone to provide a generic class of devices (I2C device id = 0xNN means power line probe, probe reports calibration factors in such format and responds to command in such other format)
Ah, that would be indeed wonderful.

Now back to lurking

--- End quote ---
From what I've seen, everyone keeps their probe interface locked down, probably even with serial numbers. The profit margin on active probes is a magnitude more than the scope itself, it's what makes the money.


--- Quote from: nctnico on August 23, 2024, 04:08:11 pm ---Why not use a push-button electronic potmeter? I have been tinkering with the idea to add an offset to my HF differential probe and I drifted towards using an electronic potmeter. The advantage is having less noise (no wiper noise), a fine and more stable adjustment and no mechanical components.

--- End quote ---
I did consider that. I think the potentiometer is the noisiest part in the design (and sometimes the BNC connector). At least my ten turns trimmer pot was definitely making more noise than these Alps potentiometers. And it's done with that in the existing probes. For now I've shelved the idea, because I like the idea of having a product with no programmable parts.

nctnico:
There are up/down button potmeter chips which don't require any programming / software. Just hook up some buttons to pins and off you go.

tszaboo:

--- Quote from: nctnico on August 23, 2024, 05:13:48 pm ---There are up/down button potmeter chips which don't require any programming / software. Just hook up some buttons to pins and off you go.

--- End quote ---
I made a quick search and for example the MAX5450 would be suitable. It's 256 tap, that would bring the resolution of nulling to 180mV. So at least two would be needed.
So browsing through the datasheets of these, you would need to press the up/down button 256 times to swipe across the range. I don't think it would be a good user experience.
I also recall using some AD digipots, and they had quite bad tempco. These seem fine though from that point of view.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod