Author Topic: Component tester on oscilloscopes  (Read 1382 times)

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Offline Axtman

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Component tester on oscilloscopes
« on: February 14, 2014, 05:27:53 AM »
I see a few oscilloscopes with a component tester feature.  Is this just a gimmick or is it a useful accessory?

Offline madires

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Re: Component tester on oscilloscopes
« Reply #1 on: February 14, 2014, 05:46:15 AM »
It's useful for a quick test and to find fishy components. You can also build such a tester yourself (quite simple) if your scope doesn't include one.

Offline Aurora

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Re: Component tester on oscilloscopes
« Reply #2 on: February 14, 2014, 06:30:07 AM »
The component tester in Hameg scopes is most definitely not a gimmick if you know how to use it.

I have several Huntron Trackers and they cost significantly more than a used Hameg scope which offers a respectable alternative.

Look up Octopus testers for the theory of operation. The one in the Hameg is not as simple as some and performs better as a result.

Offline kripton2035

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Re: Component tester on oscilloscopes
« Reply #3 on: February 14, 2014, 06:36:12 AM »
yes I compared two boards one working and one non working using the component tester of an hameg scope.
very useful for this job
useless if you want to measure a resistance or a capacitance with it.
what it lacks is the ability to store a trace, and compare it with another to find good/bad pcb
this feature is in the huntron but I wasnt able to pick one at a decent price.

Offline DC5AJ

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Re: Component tester on oscilloscopes
« Reply #4 on: February 14, 2014, 08:05:22 AM »
Alan W2AEW did a great video about component tester / octopus tester. Check it out:
Simple Component Tester using Oscilloscope - Octopus Curve Tracer
  It explains the circuit and shows the resulting patterns of various components, maybe it is interesting for you.

Online mcinque

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Re: Component tester on oscilloscopes
« Reply #5 on: February 14, 2014, 08:53:13 AM »
This is the simply schematic of Alan's video; it's a really useful adapter  :-+

« Last Edit: February 14, 2014, 08:56:29 AM by mcinque »
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Offline bsco

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Re: Component tester on oscilloscopes
« Reply #6 on: February 14, 2014, 09:03:55 AM »
That is a very simple ckt...I have a Brunelle 2988  oscilloscope and it has a built in component tester...but mine is not working...tried to get a schematic for it but couldn't find one...if anybody on this site has one that would be great...I must put this circuit together regardless as it is very simple....I have an old Eico scope that I could use it with.......Thanks for posting this....
Cheers,
Bernie

Offline mos6502

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Re: Component tester on oscilloscopes
« Reply #7 on: February 14, 2014, 05:32:57 PM »
My analog Hameg scope that I had for a few years had a component tester. IMHO: meh. There's not really much that you can test with it. Yeah, you can test pn-junctions like transistors or diodes, but a multimeter will do that better, since it also tells you the voltage drop and it's more handy for repair than a scope. As for testing caps ... maybe, if it's a very large capacitance (remember, the test frequency is only 50Hz), otherwise you just see a line.

So, I used it like maybe once every two years ... and then it didn't really help.

Now, the 99 cent ESR test adapter, that's a really useful thing to use with your scope:

http://archive.is/301HS

Offline Aurora

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Re: Component tester on oscilloscopes
« Reply #8 on: February 15, 2014, 12:14:28 AM »
I-V curves can tell you more about a semiconductor junction than a multimeter.... that is why the Huntron Tracker was such a success in industry. A Tracker can identifiy unusual situations on PCB mounted components when compared to a known good board...it can be a very efficient diagnostic tool if you use it correctly and understand the displayed images.  For those wanting an auto switching comaprison mode, the Huntron HT1005B just incorporates a SPDT relay that is driven by a simple low frequency oscillator and the relay contacts present one of the two input channels to the Trackers meaurment input. A 555 based oscillator running at 1 Hz or less and connected to a SPDT relay would be an easy implimentation of such  :)

Also these are great for seeing a worn potentiometer.....really nasty display on a poor one or one that is worn/intermittent.

I am not going to so a sales pitch on I-V display devices..... I suppose you like them and find them useful, or you don't   :)

Offline zaoka

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Re: Component tester on oscilloscopes
« Reply #9 on: February 15, 2014, 01:45:40 AM »
Component Tester must be a part of any bench. I found defective transistors many times where DMM and analog multimeter could not detect it as bad. I also own Sencore TF46, however, it also missed.

New hameg scopes also have CT built in (not all of them).

Offline GreyWoolfe

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Re: Component tester on oscilloscopes
« Reply #10 on: February 15, 2014, 02:14:43 AM »
Alan W2AEW did a great video about component tester / octopus tester. Check it out: Simple Component Tester using Oscilloscope - Octopus Curve Tracer  It explains the circuit and shows the resulting patterns of various components, maybe it is interesting for you.


His video has prompted me to build one and it does work well.  The only cost was the transformer, I had the resistors I needed.  I made a small TH PCB and stuck it in the same enclosure that I had a dual 5VDC PS. :-+
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Offline owiecc

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Re: Component tester on oscilloscopes
« Reply #11 on: February 15, 2014, 03:13:49 AM »
I had one case where it was useful. A big component looking like a diode but not behaving like one. One way quite big resistance, the other way smaller. Diode tester did not think it is a diode. When I connected it to CT you can clearly see the diode IV curve. That was 5kV diode. Forward voltage ~3V, big leakage backwards. IMO a nice feature to have but I could live without it. CT on a Hameg HMO724. Maybe more useful in a school environment.

Offline bsco

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Re: Component tester on oscilloscopes
« Reply #12 on: February 15, 2014, 04:48:32 AM »
I guess it could prove useful....like you said......not a necessity but I am going to go ahead and make one anyway....just to have it...I also repair control boards for a local company who does printing and this could be a help when I want to compare the signatures on IC chip pins  as I usually get more that one board of the same type...who knows...it may prove useful and if it don't then it didn't break the bank either...

Offline Aurora

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Re: Component tester on oscilloscopes
« Reply #13 on: February 15, 2014, 05:29:30 AM »
The Huntron Tracker 1005B1S user manual may be of interest and provides a good description of use.

http://www.ko4bb.com/Manuals/11)_Stuff_Not_Sorted/4_Miscelaneous/HUNTRON/HUNTRON-1005B1S-Operator.pdf

The Service Manual provides excellent detail of the design and how the two channel switching works.

http://www.ko4bb.com/Manuals/11)_Stuff_Not_Sorted/4_Miscelaneous/HUNTRON/HUNTRON-1005B1S-Maintenance.pdf


I have bought Hameg HM203 scopes (with built in CT) for GBP20 and that makes a pretty cheap self contained component tester ! Manual, including CT usage is here:

http://www.hameg.com/downloads/man/HM203-6_english.pdf

HM203 Schematics available here:

http://elektrotanya.com/hameg_hm203-5_oscilloscope_sch.pdf/download.html

http://www.eserviceinfo.com/index.php?what=search2&searchstring=203-6

http://www.schematicsunlimited.com/h/hameg
« Last Edit: February 15, 2014, 05:44:13 AM by Aurora »

Offline Aurora

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« Last Edit: February 15, 2014, 06:05:08 AM by Aurora »


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