Hello Thimios,
You have done a good diy job.
For sure, building by yourself these type of instruments
is much more rewarding that buying one.
I've myself learn a lot readind and building Elektor projects !
I've also build some time ago a DIY projects to measure low amplitude voltage.
This project is named ERMSDCV2 and you can find a link to the dedicated
thread in my signature. And, as my others projects, i can provide bare board.
The manual of the instrument can be find here.Full measurements results here.
Regards.
Frex
You have done a good diy job.
For sure, building by yourself these type of instruments
is much more rewarding that buying one.
I've myself learn a lot readind and building Elektor projects !
I've also build some time ago a DIY projects to measure low amplitude voltage.
This project is named ERMSDCV2 and you can find a link to the dedicated
thread in my signature. And, as my others projects, i can provide bare board.
The manual of the instrument can be find here.Full measurements results here.
Regards.
Frex
Excellent job!!!
I want to have such a thing,but i see a lot of difficult to find parts here.🙁
Especially now.....we are under capital control🙁
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Hello,
ERMSDCV2 is the name of my project.
You want to say that you are not able to to buy anything using
paypal because of capital control ?
I was thinking that you could not get particular components of the project.
Frex
ERMSDCV2 is the name of my project.
You want to say that you are not able to to buy anything using
paypal because of capital control ?
I was thinking that you could not get particular components of the project.
Frex
Yes up to now we can't pay using paypal no other card,but looking at Mouser i see many parts(from this project) marked as not available.
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Ok i understand.
About parts of the projects, all of them can be find using Mouser/Farnell/Radiospares resellers. Much are not specific and can be replaced by equivalent one.
FRex
About parts of the projects, all of them can be find using Mouser/Farnell/Radiospares resellers. Much are not specific and can be replaced by equivalent one.
FRex
Frex,
I have started to compile a buying list for your PCB.
Some are either very expensive or not available.
Could you add some notes for alternatives where some other semi does an equally good job. Even stating some limiting parameters rather than searching on our behalf for semi order codes.
I have started to compile a buying list for your PCB.
Some are either very expensive or not available.
Could you add some notes for alternatives where some other semi does an equally good job. Even stating some limiting parameters rather than searching on our behalf for semi order codes.
A first test using a Simpson analog voltmeter at 50μA scaling.
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Are some of those test frequencies 10Hz and 23.5Hz, or are they kHz?
Are all the others at 1kHz?
Are all the others at 1kHz?
Post #32 pictures 4 & 5 frequencies are 10kHz ,Pictures 6 & 7 are 23.5kHz.
I will post soon measurements up to 100 kHz when i find suitable voltmeter for comparison ,and measurements for low scales 200μV,600μV when i have a divider.
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Is the voltmeter reading the AC waveform?
Or is it reading a rectified and smoothed version of the waveform?
That will determine whether the voltmeter can read 100kHz reasonably accurately.
Or is it reading a rectified and smoothed version of the waveform?
That will determine whether the voltmeter can read 100kHz reasonably accurately.
A THD+N test set is ideal for measuring low voltage signals and most incorporate balanced floating/isolated input.
Useful for measuring distortion too.
Dan.
Useful for measuring distortion too.
Dan.
Checking the low scale 200 mV & 600 μV
A divider 100:1 used.
What you see on analog voltmeter is that you see on scope divided :100
Picture1,2,3,4,5 scale 200μV.
All other pictures scale 600μV.
A divider 100:1 used.
What you see on analog voltmeter is that you see on scope divided :100
Picture1,2,3,4,5 scale 200μV.
All other pictures scale 600μV.
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