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Looking for a multimeter with these functions

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nctnico:

--- Quote from: tonycstech on September 30, 2024, 07:18:24 pm ---While many of you engineers can argue about my lack of knowledge how electronics work (which i will not deny i have no clue how they work) it all comes down to one problem which is:
99.9% of all meters on this planet will measure 1.2K while 0.1% will measure 300ohms or if leads are reversed, 2.5k but no where near 1.2k.

--- End quote ---
My guess is that you are trying to measure in-circuit then. In that case you need to understand that all chips have transistors, MOSFETs, ESD diodes (=semiconductors) in them which cause resistance readings to depend on the measurement direction and measurement current. There is no fixed input resistance when semiconductors are involved. IMHO this is a good thing. I have used this property to find failed chips on numerous occasions by measuring resistance in both polarities and between ground and pin and supply and pin. On pins with similar functions you should measure similar resistance values when measured using the same polarity.

I think looking for a DMM with a limited open voltage is a good thing as modern semiconductors can easely be damaged by high voltages. Unfortunately many DMMs have rather high open voltages like 8V which is way too much. I like the Vichy 8145 bench DMM I have for that reason, it measures diodes using 3.3V which is generally speaking safe.

TimFox:
A digital ohmmeter usually applies a fixed current to the resistor under test, but limits the voltage compliance to avoid semiconductor damage.
With 1 mA constant current, a 2.0 kohm resistor will measure 2.0 V and be displayed as 2.0 kohm.

tonycstech:
I am trying to measure 1.8v rail on any graphics card.
Uni-T 181 is what i was looking at the other day but i think its a fluke 289 knockoff so i expect it to act the same.
If not, it would be nice but at the same time, it still does not have live trend view.

tautech:

--- Quote from: tonycstech on September 30, 2024, 07:34:11 pm ---I am trying to measure 1.8v rail on any graphics card.
Uni-T 181 is what i was looking at the other day but i think its a fluke 289 knockoff so i expect it to act the same.
If not, it would be nice but at the same time, it still does not have live trend view.

--- End quote ---
V ?
A ?
R ?

tonycstech:
what ?

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