Digital panel meter - Voltmeter / Ammeter - made in China.

An alternative to the measure / indicator described above can be the D85-3051AG model. It is bigger (and more expensive), but in my opinion it is more readable. Of course, it also has the ability to calibrate, but "out of the box" it shows what a universal meter, although it is no ;)

The price is about PLN 30 on the Chinese portal. This is how it looks in the pictures:

When this topic has already started again, and there are more and more news on the Chinese market, I would like to ask my dear colleagues what do you think about this gem.

https://pl.aliexpress.com/item/4000111098529....scm=1007.13338.192130.0&scm_id=317.133b.1933l =&scm_id=317.133b6.1933l =&scm_id=317.133b.1933l=21 -4a92-b013-47f3fbe4e38d & _t = gps-id: pcDetailBottomMoreOtherSeller, scm-url: 1007.13338.192130.0, pvid: fbca6c31-6583-4a92-b013-47f3fbe4e38d, tpp_buckets% 2361968% 2361933% 2361968% 2361933% 2361968% 2361933% 2361968% 2361933% % 23192 130% 230_3338% 233142% 239 890% 234_668% 232 846% 238 115% 232000_668% 232 717% 237 565% 23773_668% 231000022185% 231000066059% 230_668% 233,422% 2315,392% 23,326

I have it, it works fine, but the Chinese descriptions on the front are annoying.

I have a similar one, the indications are also correct after a small calibration.

I would be more interested in indicating not the power, but the energy that has been passed through this meter in the time period I am interested in, e.g. how much energy I got from PV panels on a given day, week or month.

M.R-V4 wrote:

I have a similar one, the indications are also correct after a small calibration.

Your one is a bit different where you bought it.

On aliexpress, of course
Link

To the post by Damian. For me, the parallax error caused by the lcd display is irritating.

ElectroTom wrote:

To the post by Damian. For me, the parallax error caused by the lcd display is irritating.

Can you tell by what miracle on a digital display you can get a parallax error?

Maybe it's a 3D display?

That's how it reminded me. Parallax - the effect of incompatibility of different images of the same object observed from different directions.

Hello, I bought 2 meters like in 1 post and both show 125A at once. It turned out that the Chinese did not solder the shunts, the question is what shunt should be soldered there?

Maybe not so much the Chinese forgot, as you forgot to enter the current range. In this case, the shunt will probably not be soldered, but connected with screws. Shunt suitable for the measured current range with a 75mV output (connected to the module).

Hello, what shunt should be soldered to 10A?

Added after 7 [minutes]:

Can it be like that?

Assuming that there should be a voltage drop of 75mV on the shunt at 10A, this resistor is a bit too big and probably with its use the meter will show 10A with the actual flow of 7.5A.

What is there to solder with
to be OK?

A resistor with a voltage drop of 10A at 75mV. Just.

Added after 2 [minutes]:

Of course, you also have to take into account the power that will dissipate on this resistor during the flow of the maximum current.

I will not answer unequivocally, because I do not know what the module you have looks like and whether there is a place for soldering the shunt.
I have two types of such modules, both with 10A range. In one there is a piece of wire soldered as a shunt, and in the other one there is no such soldered wire and its role is probably played by the appropriate thickness of the tin on the path.
Judging by the shunts for such modules that I saw on the Allegro, for example 50A -75mV, i.e. with a current of 50A, there is a voltage drop of 75mV on it and this voltage drop is measured by the meter and the reader shows it as 50A - I think, because no I played these blocks with electronic meters.
So with a 10A shunt, by analogy, the resistance of this shunt should be 0.0075? (7.5 m? so that at a current of 10A there would be a drop of 75mV on it.
I admit that I cannot imagine such a precise soldering of such a shunt.

Thanks for the answers, that's my measure I trimmed the shunt with it and soldered it on Monday, I will see how the measurements will come out

Hello.
I have an ammeter.

On the 16-pin system, it says FMD B1dKBMH, I haven't drawn the schematic yet and the problem is that it slightly underestimates the measurement result. With a PR of 5K at max, it still shows too little. For now, I have only made one measurement and with a load of 160mA it shows 130mA. Can the PR be exchanged for another value?

Hello archived topic but I have a problem with these meters.

I have bought several of these meters and in each the same problem namely when only the power supply is connected the module shows 52A as in the picture.

.

Apart from the phone didn't catch the digits but the display shows voltage 00.0 by current 52A thick black and red wires not connected for now if I connect the yellow one it shows supply voltage but still current 52A

Daro1003 wrote:

Apart from the phone did not catch the digits

.
Not only that. It didn't catch the shunt either. It's probably not there, but show what board there is without covering it up with plugs. If there is no shunt then plug it in and it will show the current correctly.

Yes exactly, unfortunately there is no shunt in each piece and nothing in the packaging either. I bought the voltmeter about a year ago and it was waiting to be used and now it's gone and I have no idea why it was sent and now it's useless unless you can buy such shunts somewhere in the form of a wire for driving.

You can buy shunts, you just need to specify the current and the voltage drop across it - e.g. a 50A 75mV shunt.

Yes, I need up to 50A, not more for sure, and even up to 20A, where can I buy such a thing ? And in what form for soldering to a PCB ?

>>21367162 Actually they don't look like 10A. You should somewhere in the packaging or order history have information about what it is. Shunts for these meters can be purchased e.g. here https://pl.aliexpress.com/item/10050060539410...pcDetailBottomMoreOtherSeller%7Cquery_from%3A
There is a diagram of the connection. From the description it appears to be 50A.

And this is no longer a profitable topic for 10zł you can buy 1 piece of working on allegro. I thought I could buy the wire missing from mine somewhere.

>>21367310 Item 7 is this wire. I don't see a shunt like this on Allegro under a dozen pounds with delivery and from China. I just got a refund from Allegro because the Chinese sellers there put in whatever they can find and can't deliver.

Item 7 is a gauge I think with this soldered wire. The whole 8 zł. On allegro at 10-11zl only here again shipping or on samrta and we have multi-piece.

.

>>21367419 Well, here's a tidbit for the IT industry because with me it's correct on my computer and phone (different access)