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Multimeter for a beginner?  

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robotBuilder
(@robotbuilder)
Honorable Member
Joined: 2 years ago
Posts: 654
 

@sean451

I was thinking about trying the DIY O-scope kit they sell on Amazon as a way to learn about them. Have any experience with that?

Personally I don't think kits teach you much at all except maybe to practice soldering or save some money. Essentially you have an Analog to Digital converter to provide input and the values are displayed on a screen as an xy plot where the horizontal axis is the time axis.  A slow version can be seen for a single value analog input using the Arduino and the Arduino Tools/Serial Monitor display option.

So it is the software that does all the processing and displaying of the input values.

What you need to understand, both with a multimeter and oscilloscope, is how to use them.

With regards the projects for using an RPi to build an oscilloscope I don't know what their limitations are.  I don't know what their input frequency limitations are but the "understanding" is in the software.

 

 

This post was modified 1 month ago 2 times by robotBuilder

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Sean451
(@sean451)
Eminent Member
Joined: 1 month ago
Posts: 44
 
Posted by: @jfabernathy
If you have a Raspbeerry PI check this out: http://abyz.me.uk/rpi/pigpio/piscope.html

 

Is that video in the instructions supposed to have sound? That site seems suspect to me or perhaps I just don't know enough to trust it.

--->Sean

(◕(' 人 ') ◕)


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jfabernathy
(@jfabernathy)
Estimable Member
Joined: 2 months ago
Posts: 130
 
Posted by: @sean451
Posted by: @jfabernathy
If you have a Raspbeerry PI check this out: http://abyz.me.uk/rpi/pigpio/piscope.html

 

Is that video in the instructions supposed to have sound? That site seems suspect to me or perhaps I just don't know enough to trust it.

--->Sean

The person who developed that PIGPIO library solved a lot of the limitations of the RPI with respect to hardware vs. software PWM.  The PIGPIOD is a daemon that runs as a service in background so that you have a lot more high accuracy timing on the GPIO pins of the RPIs.  It's actually included with the current RPI OS but the latest rev is usually on the gitbub site for PIGPIO.  The link is weird but not a problem

If your code won't compile, have another glass of bourbon. Eventual the problem will be solved.


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Sumanta
(@sumanta)
Estimable Member
Joined: 2 months ago
Posts: 163
 

I am planning to buy the Mastech MAS830L Multimeter. It fits in my budget and it's as accurate as I need. It costs around 700-800 INR. If anyone can suggest any other better multimeter within this price range, then it would be helpful.


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