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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
Certainly match my requirements. Will have a look around at similar ones as well. Thanks for the recommendation. I haven’t even looked at the new MOSFETs yet properly. I’m still in ancient 2n7000 and IRF510 territory.

Sounds reasonable to me. I think shoot through was what was causing my RF PA to sling bits of MOSFETs in my general direction. I increased the gate drive and it went away. I couldn’t capture this event on the tek 465 unfortunately. Bit easier on a digital scope as it only happens a few times before smoke comes out.

Specmaster:

--- Quote from: bd139 on May 31, 2018, 09:45:27 pm ---Certainly match my requirements. Will have a look around at similar ones as well. Thanks for the recommendation. I haven’t even looked at the new MOSFETs yet properly. I’m still in ancient 2n7000 and IRF510 territory.

Sounds reasonable to me. I think shoot through was what was causing my RF PA to sling bits of MOSFETs in my general direction. I increased the gate drive and it went away. I couldn’t capture this event on the tek 465 unfortunately. Bit easier on a digital scope as it only happens a few times before smoke comes out.

--- End quote ---
Hmm, I think you just made a perfectly good argument for having both a analogue and a digital scope in you tool kit right there apart from the other things that a digital scope can do that an analogue can't do. Even if it doesn't get used that much, if you can afford it then I'd say have both. I know that I'd like to have both if only I could afford both, perhaps one day I will be able to as the price drops.

tautech:

--- Quote from: Specmaster on May 31, 2018, 10:12:20 pm ---
--- Quote from: bd139 on May 31, 2018, 09:45:27 pm ---Certainly match my requirements. Will have a look around at similar ones as well. Thanks for the recommendation. I haven’t even looked at the new MOSFETs yet properly. I’m still in ancient 2n7000 and IRF510 territory.

Sounds reasonable to me. I think shoot through was what was causing my RF PA to sling bits of MOSFETs in my general direction. I increased the gate drive and it went away. I couldn’t capture this event on the tek 465 unfortunately. Bit easier on a digital scope as it only happens a few times before smoke comes out.

--- End quote ---
Hmm, I think you just made a perfectly good argument for having both a analogue and a digital scope in you tool kit right there apart from the other things that a digital scope can do that an analogue can't do. Even if it doesn't get used that much, if you can afford it then I'd say have both. I know that I'd like to have both if only I could afford both, perhaps one day I will be able to as the price drops.

--- End quote ---
Accurate confirmation of shoot through is possible with a CRO if the FET switching is repetitive.
A good current probe makes this fairly easy to see.

Yesterdays find while searching for an hour to find a part I put down a few yards from the bench instead of on the bloody bench !  |O
Bench and surrounds are now half cleaned in the search and the prize was another Tek P6021 current probe head that I'd forgotten I owned.  ::)
That makes 3.........yes 3, I'm afflicted by P6021 TEA !
Just needing another termination for it now.  :)

bd139:

--- Quote from: Specmaster on May 31, 2018, 10:12:20 pm ---
--- Quote from: bd139 on May 31, 2018, 09:45:27 pm ---Certainly match my requirements. Will have a look around at similar ones as well. Thanks for the recommendation. I haven’t even looked at the new MOSFETs yet properly. I’m still in ancient 2n7000 and IRF510 territory.

Sounds reasonable to me. I think shoot through was what was causing my RF PA to sling bits of MOSFETs in my general direction. I increased the gate drive and it went away. I couldn’t capture this event on the tek 465 unfortunately. Bit easier on a digital scope as it only happens a few times before smoke comes out.

--- End quote ---
Hmm, I think you just made a perfectly good argument for having both a analogue and a digital scope in you tool kit right there apart from the other things that a digital scope can do that an analogue can't do. Even if it doesn't get used that much, if you can afford it then I'd say have both. I know that I'd like to have both if only I could afford both, perhaps one day I will be able to as the price drops.

--- End quote ---

Honestly if I had to have one scope or worked in a professional environment I’d use only a digital scope at this point. One with a decent memory depth. The ability to catch glitches and rare events is incredibly valuable.

I have been quite frustrated debugging a few problems recently which did motivate the purchase of the digital scope. Even this evening I was arguing with PIC WDT.

tautech:

--- Quote from: bd139 on May 31, 2018, 11:02:52 pm ---
--- Quote from: Specmaster on May 31, 2018, 10:12:20 pm ---
--- Quote from: bd139 on May 31, 2018, 09:45:27 pm ---Certainly match my requirements. Will have a look around at similar ones as well. Thanks for the recommendation. I haven’t even looked at the new MOSFETs yet properly. I’m still in ancient 2n7000 and IRF510 territory.

Sounds reasonable to me. I think shoot through was what was causing my RF PA to sling bits of MOSFETs in my general direction. I increased the gate drive and it went away. I couldn’t capture this event on the tek 465 unfortunately. Bit easier on a digital scope as it only happens a few times before smoke comes out.

--- End quote ---
Hmm, I think you just made a perfectly good argument for having both a analogue and a digital scope in you tool kit right there apart from the other things that a digital scope can do that an analogue can't do. Even if it doesn't get used that much, if you can afford it then I'd say have both. I know that I'd like to have both if only I could afford both, perhaps one day I will be able to as the price drops.

--- End quote ---

Honestly if I had to have one scope or worked in a professional environment I’d use only a digital scope at this point. One with a decent memory depth. The ability to catch glitches and rare events is incredibly valuable.

--- End quote ---
You don't need lots of memory, sampling rate, colored intensity grading and a good trigger suite are the key helpers in finding glitches and rare events.

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