🔴 A Surprising Result ? - FNIRSI DSO-TC3 ESR Measurement Testing - No.1273

FNIRSI DSO-TC3 ESR Measurement Testing

Tony from the Tony359 channel had an odd result when using his DSO-TC3 to test capacitors, as I had a unit here which I reviewed a while ago I thought I could also test that aspect in more detail, it seems I hadn't done that in the review!

I show comparative testing on some bad capacitors between the FNIRSI DCO-TC3, the DER DE5000 and the Shannon Tweezer ST42, the results are interesting

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[TheDefpom]

I am talking with FNIRSI at the moment and have shared this video with them, hopefully they can fix this in firmware and issue an update.

[pault]

Thanks for keeping this information flowing clearly. Extremely valuable for consumers and the manufacturers. Hopefully firmware can fix these problems. Otherwise it’s a door stop.

[cambridgemart]

The very first cap you tested had Vloss of 0.2% and ESR of 0.48 Ohms, so the figures are clearly not directly related.

[pault]

Gorgeous case. Tries to do a lot of things and in the process doesn't do well at any of them. Hey Scott, thanks for the in depth demonstration of these types of devices. A little tip for calibrating with hooks, get a smooth gold plated pin, put all three hooks on the pin, press test, and when you need to isolate the probes pull out the pin - releases all three simultaneously without damage.

[johnprinos]

What version of firmware on the DSO-TC3 are you using? For reference

[karllangeveld]

I own the same fnirsi and DER devices. I came to the same conclusions. The fnirsi is ok for quick testing of small transistors, diodes etc, but I would not trust it to accurately measure caps. It is ok for the money, it can do quite a lot of things, but it does none of them really well. It is battery fed so it has a floating ground, which can be practical sometimes. Thanks!

[pksato]

ESR is not frequency dependent.
But measuring ESR is frequency dependent.
DSO-TC3 testing at unknown frequency.
Other two testing at 100Hz.
DE5000 have option to change testing frequency.
And, these testing just show the measured impedance or doing some maths?

[tony]

Thanks for double checking that! Good to hear it’s another useless tool which will go on a shelf. 🖖

[RensePosthumus]

To compare apples with apples, shouldn't the frequency, voltage from both devices match?

[fabiolucca]

What is the frequency used in the fnirsi test? Is it the same as the others?

[poormanselectronicsbench]

Although it is advertised as being able to do an ESR measurement, if you don't worry about doing an apples to apples comparison, and instead, pay attention to the Vloss value it generates from a test, it can still be a useful quick check tool to verify the status of an e-cap. I have gotten the feel for an older TC-1 tester to notice that, a higher Vloss value equates to a capacitor being faulty. The downside is the cap has to be taken out of circuit, as it does not test with the 100KHz frequency that allows for in-circuit ESR testing.

[TheEmbeddedHobbyist]

time to dive into the firmware to find the issue.
Or take it apart and see if the esr is a function the hardware can do.

[EHH-FPV]

Bah, i ordered one of these just last week. Hopefully they can fix it in firmware.

[GeorgeWMays]

Thanks. Interesting. I like these handy dandy testers. I've always taken their measurements with a grain of salt. Still, it would be really nice if they fixed these gizmos. Appreciated.

[YogeshChoudhary-nozg]

Hi brother I am your regular subscriber ❤❤😊 I watch your almost all videos.But I have magic keyboard copy that is not working what can I do please reply 😢😢😢

[MiBoxSupik-ukzs]

It's a software problem, because older DIY tester with 9V battery measuring right ESR values...

[guateque]

This was my most disappointing purchase. It is crap and can't be trusted.

[ThermalWorld_]

You need to calibrate it first then use it.

[unlokia]

SLOW DOWN, take a deep breath, speak a little slower please ❤ God bless you ☦️