Electronics > Projects, Designs, and Technical Stuff

DMM Lead Arc getting voltage from power strip

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DW1961:

--- Quote from: tooki on July 27, 2020, 08:44:02 pm ---It'd be interesting to see how the contacts are laid out internally. Clearly they're not designed to be probed, but then again, that's not actually a requirement for a receptacle. Given that it hasn't blown your home circuit breaker, I take it that no shorting occurs when only actual AC plugs are inserted?

--- End quote ---

No shorting when a normal plug 'was' inserted. 'Was' because the strip itself is now pushing daisies in the world's ever-growing plastic pile, and the wire (pure copper too) has just added 10 feet of what looks like 12 AWG copper wire to my collection.

ozcar:

--- Quote from: DW1961 on July 27, 2020, 10:23:50 pm ---
I can ask which fuse?


--- End quote ---

I’ll bet there is no fuse.

Your meter appears to be a re-badged BSIDE ACM81. That is the cheapest one of a trio of similar BSIDE meters, ACM81, ACM82, and ACM91. Comparison chart here: https://www.aliexpress.com/item/1970498378.html

Here is a review of the posh model: https://lygte-info.dk/review/DMMBSide%20ACM91%20UK.html

DW1961:

--- Quote from: ozcar on July 28, 2020, 07:07:05 am ---
--- Quote from: DW1961 on July 27, 2020, 10:23:50 pm ---
I can ask which fuse?


--- End quote ---

I’ll bet there is no fuse.

Your meter appears to be a re-badged BSIDE ACM81. That is the cheapest one of a trio of similar BSIDE meters, ACM81, ACM82, and ACM91. Comparison chart here: https://www.aliexpress.com/item/1970498378.html

Here is a review of the posh model: https://lygte-info.dk/review/DMMBSide%20ACM91%20UK.html

--- End quote ---

OK I'm tearing it down! The review was for an older model, so I "hope" the dude wasn't outright lying to me. The one I have does now have a diode function too. Maybe they added a fuse? lol Thanks for that link. Now I know exactly how to disassemble it.

Does this look like it has fuses? They wouldn't be under the board? Also, the reply about having fuses was by "Amazon Customer" but was worded "Our products have. . . ." When I clicked on "Amazon Customer" I got an Amazon 404 error. Something fishy going on here. I mailed the seller directly this time through the Amazon email system. We'll see what they say.

Gyro:
I see no fuses.  :)

The green blob is a PTC thermistor, to protect the Ohms, continuity, diode test etc. Q1, Q2, Q5 and Q6 are diode clamps (after the PTC).

R7A and R7B are high voltage resistors, probably the top of the voltage divider for the volts ranges. Likewise R4A and R4B (probably lower voltage range).

D1, D2, D3, and D6 will be the overload clamps for the output of the Jaw current transformer.

I can't see any evidence of current ranges on the Jacks.

Pretty much as expected, there's not a huge amount of protection on the Jacks for the Cat rating but pretty much as expected for the price range (try to avoid applying highish voltages when not on a volts range (it's always good practice to double check anyway).

Fuses are only useful for direct (on the jacks) current ranges, so it really would have been surprising if you had found any. That's what you get from generic Amazon seller advice - I'm sure he meant well though, just lacking information / knowledge, don't hold it against him.

DW1961:

--- Quote from: Gyro on July 28, 2020, 06:26:10 pm ---I see no fuses.  :)

The green blob is a PTC thermistor, to protect the Ohms, continuity, diode test etc. Q1, Q2, Q5 and Q6 are diode clamps (after the PTC).

R7A and R7B are high voltage resistors, probably the top of the voltage divider for the volts ranges. Likewise R4A and R4B (probably lower voltage range).

D1, D2, D3, and D6 will be the overload clamps for the output of the Jaw current transformer.

I can't see any evidence of current ranges on the Jacks.

Pretty much as expected, there's not a huge amount of protection on the Jacks for the Cat rating but pretty much as expected for the price range (try to avoid applying highish voltages when not on a volts range (it's always good practice to double check anyway).

Fuses are only useful for direct (on the jacks) current ranges, so it really would have been surprising if you had found any. That's what you get from generic Amazon seller advice - I'm sure he meant well though, just lacking information / knowledge, don't hold it against him.

--- End quote ---

You know I don;t know if it was the seller. It just said "Amazon Customer" but the answer started out "Our products. . . " So strange. I actually sent them an in Amazon email directly to the seller, so no way for them to avoid the question, fudge the answer.

Is there anything  can report from tearing it down that is either good or bad? I'll review it and add you analysis, if that's ok? Is it dangerous? Lacking in a way that is short lived? Anything you can think of.

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