Products > Test Equipment
Fnirsi -TC3
CharlotteSwiss:
Thanks friends, of course I know that the measurements on the circuit are often wrong. In the last board I'm checking, more than half of the measurements do not match, but I have to say that for 90% I know very well that the components are good. I had never thought of checking the components on the circuit with my T4. In fact, two probes with a suitable connection to the slot would be enough. Obviously only circuits not under voltage (and discharged caps).
indman:
--- Quote from: CharlotteSwiss on August 17, 2024, 12:13:55 pm ---In fact, two probes with a suitable connection to the slot would be enough. Obviously only circuits not under voltage (and discharged caps).
--- End quote ---
Yes, you are right, but even experienced users sometimes have problems with in-circuit tests when they forget to discharge the capacitances or there is still a residual charge on them, which can easily damage the measuring ports of the device. ;)
If you want to buy a relatively inexpensive($40-60) i advise to you but complete universal RLC measurement bridge XJW01.
This Chinese device can conduct in-circuit measurements, can be supplemented with convenient tweezers and Kelvin connectors, has a full-fledged 4-wire connection, has been tested by time and many users, has a high basic measurement accuracy of 0.3% and with proper calibration and adjustment can provide a small error of 0.1-0.2%. ;)
CharlotteSwiss:
--- Quote from: indman on August 17, 2024, 12:25:41 pm ---
--- Quote from: CharlotteSwiss on August 17, 2024, 12:13:55 pm ---In fact, two probes with a suitable connection to the slot would be enough. Obviously only circuits not under voltage (and discharged caps).
--- End quote ---
Yes, you are right, but even experienced users sometimes have problems with in-circuit tests when they forget to discharge the capacitances or there is still a residual charge on them, which can easily damage the measuring ports of the device. ;)
If you want to buy a relatively inexpensive($40-60) i advise to you but complete universal RLC measurement bridge XJW01.
This Chinese device can conduct in-circuit measurements, can be supplemented with convenient tweezers and Kelvin connectors, has a full-fledged 4-wire connection, has been tested by time and many users, has a high basic measurement accuracy of 0.3% and with proper calibration and adjustment can provide a small error of 0.1-0.2%. ;)
--- End quote ---
In fact, it's better that I don't invent something with the T4. In my safety notes when studying it, I wrote to download the caps well so as not to burn the Atmega.
For your advice, I write in the relevant topic (xjw01) ;)
siealex:
A question for all users of DSO-TC3. Can you perform the following actions?
1. Take an electrolytic capacitor (e. g. 100 μF) and test it on the component tester.
2. Connect a low Ohm resistor (5..10 Ohm) in SERIES to the same capacitor and test again.
Will the ESR difference correspond exactly (within ~10%) to the additional resistor?
On my device:
220 μF 63 V Samwha SD: 209.2 μF 0.08 Ohm.
The same capacitor + 8.98 Ohm 0.5% resistor: 211.3 μF 1.2 Ohm (!!!). How on Earth?
On an old ATmega based component tester:
The same capacitor itself: 206.1 μF 0.19 Ohm.
With the resistor: 208.0 μF 8.49 Ohm. Slightly low (the correct value should be around 9.1 Ohm), but still reasonably close to truth.
The resistor itself displays 9.0 Ohm on BOTH TC3 and the old tester.
W. T. F.???
Phil1977:
I can confirm it.
100μF + 15 Ohm show ESR of 2.1 Ohm at the DSO-TC3
6.8 Ohm at a supercheap T7-tester
16 Ohm at the "most original" AVR-tester I have
Seems to be better not to trust the ESR values of the TC3.
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