Author Topic: Beeper on programmable resistance  (Read 467 times)

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Offline arduicTopic starter

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Beeper on programmable resistance
« on: January 18, 2025, 07:05:43 am »
There have been times in the lab where I've been looking for a set resistance on a pcb (say 10k). I would love a meter that beeps like a continuity check but for a programmable resistance so I can quickly check for a variety of values. Does such a piece of equipment exist? Bonus points if the equipment can beep on other things like voltage.
 

Offline Someone

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Online 2N3055

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Re: Beeper on programmable resistance
« Reply #2 on: January 18, 2025, 11:20:05 am »
There are many meters where you can set threshold for continuity.
Also there are meters that have pass/fail function where you set limits and meter signals Ok/not Ok
"Just hard work is not enough - it must be applied sensibly."
Dr. Richard W. Hamming
 

Offline Aldo22

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Re: Beeper on programmable resistance
« Reply #3 on: January 18, 2025, 01:50:32 pm »
There are many meters where you can set threshold for continuity.
Also there are meters that have pass/fail function where you set limits and meter signals Ok/not Ok

“Pass/fail” gave me an idea.
I wanted to see if I could do this with my cheapie scope.
For measuring 10k I used a 100R “shunt” resistor.
Then put 1VDC on it.
Since the scope beeps at a pass (or fail), it actually works.
The accuracy is not very high, but that is clear.

With Math Div and Track Cursors I managed to display the value of the resistor (AY or BY, V = kΩ).
Figure 1 shows the 10k resistor (pass).
Figure 2 shows a 5.1k resistor (fail).
This is of course very impractical, but it works.
Sorry for the disturbance! I'm just playing.   ;)

« Last Edit: January 18, 2025, 01:54:49 pm by Aldo22 »
 

Offline arduicTopic starter

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Re: Beeper on programmable resistance
« Reply #4 on: January 18, 2025, 02:41:49 pm »
Hmmm guess I should have specified.  I was really hoping for a portable meter.  Bench top would work but is not ideal given how far I sometimes need to move during testing.
 

Offline DaneLaw

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Re: Beeper on programmable resistance
« Reply #5 on: January 18, 2025, 03:57:06 pm »
most of the cheap portable milliohm meters (many labelled as batterytester) have an adjustable pass/fail-mode.
Like the AC or DC models from Yaorea YR1030/35 (AC) or YR2050 (DC) same with the models from Fnirsi HRM10. (prices from 20 to 40 bucks)
Havent tested them for sorting purposes for passive components, and to what extent they need a voltage, as the main use case for a few of the models is batteries.
 

Offline arduicTopic starter

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Re: Beeper on programmable resistance
« Reply #6 on: January 18, 2025, 06:31:55 pm »
Most of those only work up to a few hundred ohms so they won't work but clever idea. It's often things like checking for 10Kohms at multiple locations on a PCB.
 

Offline DaneLaw

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Re: Beeper on programmable resistance
« Reply #7 on: January 19, 2025, 12:22:03 am »
Your right..10K gonna be a challenge ..even though a YR2050 got a dedicated 1K range (120.000 count) it will max out at [1200.00Ohm] so 10K no dice.
 

Online ledtester

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Re: Beeper on programmable resistance
« Reply #8 on: January 19, 2025, 12:51:27 am »
The DE-5000 LCR meter has a pass/fail mode (which they call sorting). You can set the target value and tolerance from one of: ±0.25% ±0.5%, ±1%, ±2%,±5%, ±10%, ±20%, and -20%+80%.

And it will beep when a component passes.

 

Offline shabaz

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Re: Beeper on programmable resistance
« Reply #9 on: January 19, 2025, 03:12:38 am »
One other portable option, requires a tiny bit of coding though, would be to get a Bluetooth enabled Multimeter. Then it's possible to add all manner of custom functions to run from a mobile phone.
Example of a low-cost Bluetooth meter here (the code is on GitHub if anyone wanted to add a custom feature):
https://youtu.be/vf-02j6GisY

 


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