[time-nuts] 5 Digit Panel meters

[DM]

I must caution all who would buy the 5-digit panel meters, thinking that they are actually capable of accuracy that you would normally expect from a 5-digit meter. 
The panel meters in question use a STM8S003F3 micro-controller, which contains a single 10-bit A/D. Depending on which eBay or AliExpress listing you look at, accuracy varies from 0.3% to 0.05%. 
Make your own deductions from this info, just be aware that all is not what you might expect of this cheap little meter. 

Cheers, 
Dave M 


From: "Perry Sandeen via time-nuts" <time-nuts at lists.febo.com> 
To: time-nuts at lists.febo.com 
Cc: "Perry Sandeen" <sandeenpa at yahoo.com> 
Sent: Monday, September 7, 2020 12:20:12 AM 
Subject: [time-nuts] 5 Digit Panel meters 

Learned List, 
>From the on and off list comments I've received I realize that I didn't provide a fuller explanation of my proposed idea for this I apologize. 
What I was proposing was to try and use the tiny panel meters fount on ebay when you use the category listed as *Digital Panel Meters*. One listing number is 203076543505. Measurement range: DC: 0.000-33.000V. for $3.83 plus free shipping. This is just one of many listings for similar items. As I stated in my original post, I have no idea if they are accurate, stable or suitable to what I proposed. 
Some of the replies mentioned temperature drift and other potential problems which may make then unsuitable for my idea. This was to measure three different voltages simultaneously and see if there was some useful correlation in the readings. 
This is an experimental concept idea which may or may not be useful..Sometimes these ideas work or we learn to go to plan *B, C, or D* 
Because of the low cost i felt that this might a useful idea. Others with more experience of these voltages and how much they do or do not change may judge my idea as impracticable. 
That's fine. 

I learn from the list comments and I'd rather hear that it's not a good idea from the members before spending the money and effort. 
I do have a Fluke/Phillips 6.5 for making precise reading when needed. 

Regards, 
Perrier 




_______________________________________________ 
time-nuts mailing list -- time-nuts at lists.febo.com 
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com 
and follow the instructions there.