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Looking for a multimeter with these functions

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BillyO:

--- Quote from: tonycstech on September 28, 2024, 04:33:16 am ---live(or slightly delayed) data graph for voltage and resistances
Uses 3v to measure diode
uses 2v to measure resistance
can read as low as 0.01 ohm

and is decent overall ?

--- End quote ---

Have a look at the FNIRSI DMT-99.  It seems to come close to what you want.

Has data graph
Uses 4V to measure diodes (a bit higher than you wanted, but not ridiculous)
Uses 0.61V to measure ohms  (will not be affected by most semiconductors in circuit).
Can read to 0.01 ohm  0.1Ω
Is very solidly built.

It's also compact, light and cheap.

Edit: So, I guess it does not meet your specs after all.  I got the ohms range wrong before.

Antonio90:
Hello tonycstech.
The UT181 will put a max compliance voltage of 1.2 in the kOhm range and upwards, below that is 3.3V. The graphing is not live though, you have to record and then plot, unless you use the included IR interface.
The Metrix MTX 3282 (and I guess the rest of the series) has an around 1.2V max compliance voltage, which drops pretty quickly. It is discontinued, and a bit quirky in a few regards, but you might find one second hand. It does live graphing.
2N3055 recommended, in the third reply, a currently  produced model. Also has live graphing but it is quite expensive.

Also, the Ohms function in DMMs is designed to work with ohmic circuits, and intends to give results relative to Ohm's law. If you are using it for a different purpose and it doesn't work, it doesn't mean there is a design flaw, or that the meter is crap, you are just using it for a different purpose. The fact that some of them work is just a nice bonus with some DMMs. That's why you are getting flak.

I think what you are trying to measure is a circuit signature (not sure about that name). There are expensive curve tracers for automated test setups, which compare the traces of products with a known good sample in the production line.
In this case, that is kind of what you are doing, identifying problems with controlled test conditions by comparing with a known good sample. You might be able to use the ohms function, but the tool for this is not necessarily an ohm meter.
You might be better off modifying one of the "shorty" circuits, or using an Analog Discovery.

EDIT: The diode test voltage of both the Metrix and the UT181A is ~3.1V.

nctnico:

--- Quote from: BillyO on October 01, 2024, 03:02:21 pm ---
--- Quote from: tonycstech on September 28, 2024, 04:33:16 am ---live(or slightly delayed) data graph for voltage and resistances
Uses 3v to measure diode
uses 2v to measure resistance
can read as low as 0.01 ohm
and is decent overall ?

--- End quote ---

Have a look at the FNIRSI DMT-99.  It seems to come close to what you want.

Has data graph
Uses 4V to measure diodes (a bit higher than you wanted, but not ridiculous)
Uses 0.61V to measure ohms  (will not be affected by most semiconductors in circuit).
Can read to 0.01 ohm
Is very solidly built.

It's also compact, light and cheap.

--- End quote ---
But the specifications are ridiculously bad. Like 1.5% accuracy on resistance measurements. It has 10000 counts (0 through 9999) but it could just as well have 100 counts and still show the result with the same accuracy.

BillyO:

--- Quote from: nctnico on October 01, 2024, 03:53:04 pm ---But the specifications are ridiculously bad. Like 1.5% accuracy on resistance measurements. It has 10000 counts (0 through 9999) but it could just as well have 100 counts and still show the result with the same accuracy.

--- End quote ---
Well, he seems to hate better meters.

Another nice feature of is that it autoranges shockingly fast.  Even in auto mode it will determine what parameter you are measuring and provide a value 3 times faster than the Brymen 786, which is already switched to the correct mode (Ω for instance).

I love a 6.5 digit meter with 0.01% accuracy on ohms as much as the next guy, but repair work is not like R & D or experimentation.   Insane accuracy is not key.  You are mostly trying to see if a component has failed rather than whether a 1% resistor is 0.01% out of tolerance.

Also, try not to cherry pick or use lies of omission when you're denigrating something.  That's an untrustworthy politician's move because he thinks no one will fact check him (see Donny Trump as an example).  That 1.5% tolerance you tried to pass of as the entire story is only for the 99.99MΩ range.  Everywhere else in Ω it is 0.5%  which is fine for an inexpensive meter like this.

nctnico:
It says right here that the 1.5% is for the entire Ohm range:
https://www.toolworld.in/storage/media/product/technical_documents/DMT-99%20Multimeter.pdf

Since most circuits use 1% resistors nowadays, I'd like to have a meter with more accuracy than the components which isn't hard to achieve. I do hope you agree with the fact the DMT-99 is showing way too much digits versus its accuracy. I hope you also see that measuring 0.01 Ohm is not going to happen with a relatively simple, 2 wire DMM. Heck, most 6.5 digit DMMs will have trouble doing that even though these typically have 4 wire connections. Your best bet for measuring low resistance values is likely the Keithley DMM6500 which has a 1 Ohm range versus the usual >= 200 Ohm range being the lowest range for resistance measurements on DMMs.

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