Electronics > Beginners

Component identification

<< < (3/6) > >>

Brumby:
Firstly, for any given type of measurement, there are 12 possible combinations (not just 4) for two terminal measurements on a 4 lead device:
1 - 2;  1 - 3;  1 - 4;  2 - 3;  2 - 4  and  3 - 4
 and their reverse:
2 - 1;  3 - 1;  4 - 1;  3 - 2;  4 - 2  and  4 - 3
This covers the six permutations of the 4 leads and the two polarities for each.

So, for a resistance check, I would be interested to see those 12 measurements.  It might also be interesting to see the 12 results for capacitance as well as the 12 results for diode check.

This is where I would start.

ArthurDent:
"Let me remind you that this is the beginners forum. So please be clear with what you want me to do."

Sorry, I thought I was being clear. I said: "if the readings 1-2 are different than the readings 2-1 with your meter in diode test mode, there might be diodes inside."  If that is what you have done in the second part of your test, and your meter actually shows forward voltage drop, it is unlikely there are any diodes inside because .2 volts is way too low. Check out any diode you have with your meter and see what the readings are forward/reverse.

Also ignore the date codes because they add nothing to the discussion.

The suggestion by drussell is good but that requires you to know what the octopus circuit is and requires a scope so it may not be useful to you.

drussell:

--- Quote from: ArthurDent on September 13, 2018, 04:55:56 pm ---The suggestion by drussell is good but that requires you to know what the octopus circuit is and requires a scope so it may not be useful to you.
--- End quote ---

Indeed, it was my assumption that the OP does not have access to an oscilloscope, so I didn't elaborate further to confuse the discussion.  I just wanted to point out that there are potentially ways of identifying things like this mystery component that may be more insightful than the readings that can be provided by a multimeter in a case like this.

Jelcke, do you have access to an oscilloscope?  Perhaps an electronics-savvy friend, local school, maker space, etc.?

Jelcke:
Yes, I have a Tektronix 485  / Tekscope 720 / siglent SDS 1102CMl+. + Der EE LCR meter + Multimeters, function generators, Counters , sweep generators etc. etc..
I can even hook it up to my AVO 160 tube tester or test the THD or freq. response with my Audio precision system one if you want ;-)
BTW My Component identifier only sees the resistance and my transistor tester (Peak atlas DCA pro) sees no device.
Second: I have 4 variants of this device and 5 of each so it is not one device that may be broken or such...

I will make the RCA octopus.

 CA4 4.5 600 76-19
Resistance:
1 - 2 : 1.259K
1 - 3 : 160R
1 - 4 : 1.265K
2 - 1 : 1.265K
2 - 3 :  1.259K
2 - 4 : 160R
3 - 1 : 160R
3 - 2 : 1.265K
3 - 4 : 1.259K
4 - 1 : 1.265K
4 - 2 : 160R
4 - 3 : 1.259K


And their reverse resistance is the same.

Voltage drop in diode mode (107MVAC) (reverse polarity is the same)

1 - 2 : 1.134V
1 - 3 : 0.204V
1 - 4 : 1.138V
2 - 1 : 1.135V
2 - 3 : 1.138V
2 - 4 : 0.204V
3 - 1 : 0.204V
3 - 2 : 1.139V
3 - 4 : 1.135V
4 - 1 : 1.138V
4 - 2 : 0.204V
4 - 3 : 1.135V

Capacitance @ 100kHz
1 - 2 : 404nF
1 - 3 : 3.76uF
1 - 4 : 386nF
2 - 1 : 355nF
2 - 3 : 3.93uF
2 - 4 : 3.42uF
3 - 1 : 3.65uF
3 - 2 : 3.66nF
3 - 4 : 375nF
4 - 1 : 378nF
4 - 2 : 3.50uF
4 - 3 : 345.6nF

Inductance  @ 100kHz
1 - 2 : 7.127uH
1 - 3 : 0.730uH
1 - 4 : 7.054uH
2 - 1 : 7.234uH
2 - 3 : 6.525uH
2 - 4 : 0.647uH
3 - 1 : 0.685uH
3 - 2 : 6.691uH
3 - 4 : 7.055uH
4 - 1 : 6.917uH
4 - 2 : 0.685uH
4 - 3 : 7.057uH


ArthurDent:
Judging from the physical size of these modules there appears there is no way there could be a nearly 4 uF capacitor inside. You appear to be misinterpreting what is inside even though you seem to have enough equipment to actually figure it out. Good luck.

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