Products > Test Equipment
Looking for a multimeter with these functions
J-R:
The graphics cards are going to have similar operating principles and similar PCB layouts. So obviously you are going to learn what to look for, even if your method is flawed from a technical standpoint. It's fine to go that route if you've got work to do. But from a "right" and "wrong" perspective, you're just flat out wrong and the more you double-down on your position, the more foolish you look unfortunately.
You already know how to inject voltage into various parts of the circuit to look for shorted components. The same principle applies with my suggestion to use a bench power supply set for the values you want.
TimFox:
--- Quote from: tonycstech on September 30, 2024, 09:54:35 pm ---i fixed nearly 100% of all devices that come to me with my inherently flawed thinking. Lucky or maybe i see what most people dont ?
I dont even have autism to be this smart :P if anything, i see my self as plain stupid |O
I knew this wouldn't go anywhere since the very 1st reply.
Why am i still here ?
For the same reason i have high success repair rate. Just cant let it go.
--- End quote ---
Even if you don’t understand the circuit you are testing, nor how your different instruments work, nor what “resistance” actually means, it is allowed to write a test procedure, based on your empirical observation, to use a specific instrument and specific connections, with the allowed range of displayed values, even if the actual measurement is not understood.
However, if your instrument is no longer available some years hence, someone will have to start over.
That’s why we are trying to educate you despite your stubbornness.
tonycstech:
Correct my theory if am wrong (am sure i am)
A: multimeter uses 2v to measure resistance and gets 300ohms because parts of the circuit it measures gets enough current from those 2v to actually do something with it, such as pass it alone down the line or the other way around. This make sense considering typical voltage any transistor gates is anywhere from 1-3v and the fact that there are semi conductors just complicates this process even more.
B: multimeter uses 0.5v to measure resistance and gets 1.2k because none of the parts of a circuit get enough current to do anything with the 0.5v and therefore resisting the current flow much less giving you higher value in Kohm range.
Thats what i think is happening here.
For that reason, i want to lower the voltage and limit the current to get the same results of a chinese meter.
Cant do it. No one can. Whats the point of this conversation ? No point.
TimFox:
--- Quote from: tonycstech on September 30, 2024, 11:25:03 pm ---Correct my theory if am wrong (am sure i am)
A: multimeter uses 2v to measure resistance and gets 300ohms because parts of the circuit it measures gets enough current from those 2v to actually do something with it, such as pass it alone down the line or the other way around. This make sense considering typical voltage any transistor gates is anywhere from 1-3v and the fact that there are semi conductors just complicates this process even more.
B: multimeter uses 0.5v to measure resistance and gets 1.2k because none of the parts of a circuit get enough current to do anything with the 0.5v and therefore resisting the current flow much less giving you higher value in Kohm range.
Thats what i think is happening here.
For that reason, i want to lower the voltage and limit the current to get the same results of a chinese meter.
Cant do it. No one can. Whats the point of this conversation ? No point.
--- End quote ---
Now you are acting like a stubborn jerk. In my first reply to your other post, I told you exactly how to lower the voltage and measure the apparent resistance.
https://www.eevblog.com/forum/testgear/lower-voltage-for-resistance-measurement-for-fluke-289/msg5658253/#msg5658253
There is a type of device that would probably work for you. It is programmable, very flexible, and rather expensive: technical name "source-measure unit".
Examples:https://www.tek.com/en/products/keithley/source-measure-units
A field engineer from Keithley could probably show you how to program it for your application.
Used, they run from roughly $3500 to $6000 USD
ArcticGeek:
I don't know if this will work for your measurement or not, but the OLD Beckman Tech 3XX meters (Tech 310,320,330) have a very low in circuit voltage of only 200mV when measuring resistance. It's an oldie but a goodie, and its the lowest voltage I've ever seen on a multimeter. The meter is not auto-ranging like today's multimeters (Fluke or otherwise), but its a low enough voltage it won't turn on silicon junctions.
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