MJLorton Solar Power and Electronic Measurement Equipment Forum
Youtube Video Episodes => YouTube Video Episodes => Topic started by: SeanB on February 19, 2014, 03:03:12 PM
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http://www.youtube.com/watch?v=j1UVd3dBRq0
Short simple explanation of the differences between digital and analogue meters. Includes how to read the meter for best resolution and least error.
Digital readouts can be more precise, but increased number of digits and fast changing signals are hard to read, while an analogue meter shows trends very easily.
Resistance as well, where the scale is cramped at the high end of the range, and easier to read at the low end.
Just note that most analogue meters are somewhat orientation sensitive, they are best if the meter movement is flat on a firm surface, and may give an offset if used at an angle unless the meter movement is very well balanced and well damped. You can easily check for this by applying a reading that will be at around 2/3 of full scale and tilting the meter and seeing if the reading stays exactly the same at various orientations of the meter. Most will have a slight variation in the displayed value.
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I have that same analog model that Martin reviewed and my biggest gripe, NO stand! Why??? You have to lay it flat or prop it on a small box or some other object to get a nice readable angle.
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I have that same analog model that Martin reviewed and my biggest gripe, NO stand! Why??? You have to lay it flat or prop it on a small box or some other object to get a nice readable angle.
I'd make a guess that its because a certain orientation is required for an accurate reading. All the analogue meters that I have used are calibrated for use when horizontal.
The scale on the meter Martin has looked rather complicated I though. Though that could be because I'm used to AvoMeters.