Unit | Reference | Measured |
|Z| | 57.589R | 57.347R |
Rs | 923.101mR | 887.992mR |
D | 0.014433 | 0.015486 |
Unit | Reference | Measured |
|Z| | 79.990mR | 73.992mR |
Rs | 21.821mR | 19.488mR |
D | 0.282733 | 0.284133 |
Hi, Jaxbird!
I'm glad they came through OK. Did they make you pay any customs duty?
First thing I notice is the SRF of your measurement appears to be at about 400 kHz, whereas the sweeps I included indicate about 750 kHz. I made sure the parts were inserted into the fixture with the absolute shortest leads possible, which typically is right up against the body of the part in the case of the capacitors. I suspect you have just a little more lead length involved in your measurement, or perhaps your compensation for the parasitics of your clips is a little off.
But, besides that, this is a really great project! Wouldn't it be nice to be able to get reasonably accurate impedance sweeps for only a few hundred dollars instead of 10's of thousands?
I hope to be able to construct and share such a device, sure, it will not be a reference device suitable for publishing datasheets, but something generally useful to get a good idea of behavior/performance.
I hope to be able to construct and share such a device, sure, it will not be a reference device suitable for publishing datasheets, but something generally useful to get a good idea of behavior/performance.
I think it's doing quite fantastic! Don't forget, by the way, especially for electrolytics, the ambient temperature effects. It's instructive to run the analyzer in continuous sweep mode and heat up a component with a "warm" air gun, or even just grasp it, and watch the ESR of an electrolytic change; of course, you can do that without needing a sweep.
People buy a DE-5000 for $100. I'd easily pay a few hundred for sweep capability. A person learns after playing with an impedance analyzer that you can tell the health of an electrolytic in an instant with a single sweep.
I hope to be able to construct and share such a device, sure, it will not be a reference device suitable for publishing datasheets, but something generally useful to get a good idea of behavior/performance.
I think it's doing quite fantastic! Don't forget, by the way, especially for electrolytics, the ambient temperature effects. It's instructive to run the analyzer in continuous sweep mode and heat up a component with a "warm" air gun, or even just grasp it, and watch the ESR of an electrolytic change; of course, you can do that without needing a sweep.
People buy a DE-5000 for $100. I'd easily pay a few hundred for sweep capability. A person learns after playing with an impedance analyzer that you can tell the health of an electrolytic in an instant with a single sweep.
This is most excellent!![]()
See that bump in the ESR and DF at about 3 MHz? The first time I saw that on a large film cap, I thought something was wrong with the analyzer or the fixture. But it's real; it looks just like that on an Agilent 4294 and on the Wayne-Kerr. I think it's an internal resonance due to the nature of the metallization sprayed on the ends of the extended foil.
Your analyzer shows it perfectly!
and the $250 of the dev board he uses could easyly be replaced with a small mcu + good adc board self made for some $50 IMHO.
the dev board helped to develop the thing faster, but is overpriced for how he uses it ?
He already has it, so its adding addtional functionality to the tool. The discovery can be had for 99 bucks, that all I paid for mine. I would be interested to see your 50 buck implementation though.
To qualify for student pricing, the customer must be a student at a US academic institution and be required to purchase the board for a class. The quantity is limited to one board per student.
That is astounding!![]()
It matches the reference curves so well it's hard to believe you can get such good performance with so little hardware.
This shows that a low priced USB based box could be sold for a few hundred dollars--certainly well under $1000!
This has got to be one of the neatest projects on the forum.
and the $250 of the dev board he uses could easyly be replaced with a small mcu + good adc board self made for some $50 IMHO.
the dev board helped to develop the thing faster, but is overpriced for how he uses it ?
Been following this interesting thread/project. Jaxbird .![]()
What's your plans when completed project. ?