Author Topic: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF  (Read 18695 times)

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Offline maginnovision

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #250 on: October 09, 2019, 06:46:12 pm »
Mine showed up, dicky contact switch but ok after cleaning. Matches specs just fine. See if any others show up. Few more checks, multimeter functions seems within specs too. The 24V is also 23.192, so pretty much same as amspire.

For the contact switch it needed to be 100% cleaned as the grease was conductive. After cleaning I tried and it was still poor likely due to the small switch contact(middle) moving around. I lubed the board contacts with good quality grease and it works perfectly fine. I did clean any and all residue from the PCB. Pretty dirty and not just flux, seems the grease they used was all over the bottom half of PCB on display/button side.
« Last Edit: October 09, 2019, 08:36:22 pm by maginnovision »
 
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Offline Xenoamor

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #251 on: October 09, 2019, 07:55:07 pm »
Is this guy on DhGate admitting to falsely shipping an item?
 

Offline maginnovision

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #252 on: October 09, 2019, 07:59:46 pm »
Is this guy on DhGate admitting to falsely shipping an item?

See what dhgate says. I suspect I'll never order anything from there
 

Offline Xenoamor

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #253 on: October 09, 2019, 08:09:56 pm »
See what dhgate says. I suspect I'll never order anything from there

I'm giving him the benefit of the doubt and asking him to clarify.
Dhgate claim they'll give you $30 credit if a seller sends you a false shipping number so it would be interesting to see what comes of it if he has
 

Offline blargg

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #254 on: October 09, 2019, 08:57:57 pm »
Is this guy on DhGate admitting to falsely shipping an item?

Also from same seller on dhgate, two tracking numbers show up in order details. Last digits:

885CN
635YP

Do these match yours? Anyone else, did seller give the same tracking numbers to us all?
 

Offline RobertPS

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #255 on: October 09, 2019, 09:17:48 pm »
Is this guy on DhGate admitting to falsely shipping an item?
He's probably just doing what he always does: getting a shipping/tracking number, maybe preparing the box, so he can ship quickly when his supplier delivers the goods. These stores don't have stock for most items.
In this case, there's no supply anymore, so he's stuck with the tracking numbers and no product. Just like you.
 

Online beanflying

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #256 on: October 09, 2019, 09:45:28 pm »
Is this guy on DhGate admitting to falsely shipping an item?
He's probably just doing what he always does: getting a shipping/tracking number, maybe preparing the box, so he can ship quickly when his supplier delivers the goods. These stores don't have stock for most items.
In this case, there's no supply anymore, so he's stuck with the tracking numbers and no product. Just like you.

That is not correct in my case as the supposed parcel shows progress through the postal system with three stops. This is clearly a case of fake tracking numbers provided.


mine ends in 056YP for what it is worth.


Quote
tonethiny 2019-10-09 17:25

Dear friends
very sorry
We have found a lot of homes
They all said that this product is out of stock now.
Ali and Taobao are also out of stock
We can only give you a refund now.
May I?
Please understand
Thank you
« Last Edit: October 09, 2019, 10:29:54 pm by beanflying »
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Offline RobertPS

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #257 on: October 09, 2019, 10:55:41 pm »
Is this guy on DhGate admitting to falsely shipping an item?
He's probably just doing what he always does: getting a shipping/tracking number, maybe preparing the box, so he can ship quickly when his supplier delivers the goods. These stores don't have stock for most items.
In this case, there's no supply anymore, so he's stuck with the tracking numbers and no product. Just like you.

That is not correct in my case as the supposed parcel shows progress through the postal system with three stops. This is clearly a case of fake tracking numbers provided.


I stand corrected. A google search reveals that Yanwen seems to be widely associated with fake tracking.
 

Online amspire

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #258 on: October 10, 2019, 12:54:28 am »
Just had a quick look at the serial output of the meter. It is actually very well isolated, and so this meter is a cheap way of data logging.

It appears the Semico CS7721CN chip is outputting data at 2400 baud in packages of 12 to 16 bytes - I haven't put a logic analyser on it yet. The sample rate period is about 700 ms.

I haven't found any data yet for the 7721 chip, so if anyone can find it, it would help.

I am expecting a format such as a range byte, 4 digits for the measures value, a function byte (volts, mA, uA, Capacitance, etc), a status byte (things like low battery), and some option bytes which include things like a bit for AC or DC mode. It appears the string ends with a linefeed byte (0x0A).

I have had a look at the sigrok.org site and it doesn't appear they support any CS7721CN based multimeters yet, but unfortunately half the contributors didn't bother to mention the multimeter chipset.

Richard.
« Last Edit: October 10, 2019, 12:56:03 am by amspire »
 

Offline BradC

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #259 on: October 10, 2019, 01:02:14 am »
Just had a quick look at the serial output of the meter. It is actually very well isolated, and so this meter is a cheap way of data logging.

It appears the Semico CS7721CN chip is outputting data at 2400 baud in packages of 12 to 16 bytes - I haven't put a logic analyser on it yet. The sample rate period is about 700 ms.

I haven't found any data yet for the 7721 chip, so if anyone can find it, it would help.

There was a data sheet linked up thread somewhere (too hard to locate on an iPad). The protocol in there documented sending out the LCD segments. So basically a mirror of what is on the display. Each byte was an identifier (high nybble) and 4 individual segments (the low nybble) and they were sent in sequence repeatedly.
 

Online TurboTom

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #260 on: October 10, 2019, 01:11:59 am »
Here's my message where I linked the Fortune Semiconductor equivalent of the chip used in this instrument.
 

Online amspire

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #261 on: October 10, 2019, 01:18:34 am »
Here's my message where I linked the Fortune Semiconductor equivalent of the chip used in this instrument.
If it is the same, that is great as Sigrok supports a number of Fortune 9721 multimeters like the Uni-T UT60E. I will probably have to look at the Silabs serial chip data to find out how to get X-OFF/X-ON working. If you just read the chip continuously, most of the time you just get the last 4 bytes in the data buffer that looks something like "0x61 0x67 0x33 0x0A"
« Last Edit: October 10, 2019, 01:22:19 am by amspire »
 

Offline ResistorRob

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #262 on: October 10, 2019, 02:34:56 am »
I ordered mine from Wish for $53 shipped, and today they canceled the order and refunded my money! Not cool!
I don't care about the multimeter part, and think I found something similar for about $25 so will order that instead.
I'm definitely not paying almost $300 for one of these things!
 

Online amspire

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #263 on: October 10, 2019, 06:22:34 am »
Here's my message where I linked the Fortune Semiconductor equivalent of the chip used in this instrument.
If it is the same, that is great as Sigrok supports a number of Fortune 9721 multimeters like the Uni-T UT60E. I will probably have to look at the Silabs serial chip data to find out how to get X-OFF/X-ON working. If you just read the chip continuously, most of the time you just get the last 4 bytes in the data buffer that looks something like "0x61 0x67 0x33 0x0A"
Looks like the serial protocol is nothing like the Fortune 9721 chip unfortunately.

I have the logic analyser set up and I will start a new thread. The serial packet is 2400 baud 8bit no parity LSB first. There are 14 bytes and the 4 most significant bits of each byte is the byte number in the packet - the bytes are numbered 1,2,3,4,5,6,7,8,9,A,B,C,D and E.

The lower 4 bits of each byte is the data. When I get back home, I will work out what some of the packets do. I think I have identified the ones containing the readings.

Update:
This site has some python code for a similar chip - the difference is that the multimeter this code is written for output an extra 5 bytes of unknown junk at the start.

https://sourceforge.net/projects/qm1571-multimeter/files/

Looks like the code is compatible with the Fortune FS9721 chip so I have no idea what that protocol file I got from Sigrok is on about.

The following multimeters all use a similar meter chipset:
Altronics Q1079,
Digitech QM1571,
DT4000ZC,
Harbor Freight 98674,
Mastech MS8229,
PCE-DM32,
Tecpel DMM-8061,
Tecpel DMM-8061,
Tenma 72-7745,
TP4000ZC,
UT60A,
UT60E,
Vichy VC97,
Voltcraft MT-52,
Voltcraft VC-820,
Voltcraft VC-840.
« Last Edit: October 10, 2019, 09:24:05 am by amspire »
 

Offline maginnovision

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #264 on: October 10, 2019, 07:23:29 am »
My second My Cozy Life Store meter shows shipped, however I'm not sure I believe it this time. I also tested the one I got today after I got it all working properly. Tested AC and DC up to 120V. Current 100uA to 1A. After that I wanted to check the p-p and rms noise for the outputs. However I found the output was no longer working properly. The OP296(Daves had a 297 in the same spot) was getting extremely hot. Removing it didn't fix anything, but it also didn't make anything worse. All meter readings were ok, the 24V output was unaffected(unsurprisingly), but the current and voltage outputs basically start at 0 and climb until reaching the end of the range and resetting. I didn't have time to check it further but it's pretty odd. Just to add, I didn't do those checks with the source/simulate jacks.
 

Offline Electro Detective

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #265 on: October 10, 2019, 07:54:34 am »

"Hello freind again,

is good news finally

we ship out blue meter today after salvage from sunk delivery boat, recover by harbor freight police divas after water pirate attack

lucky crew of old peoples and children wet and scare, but no harm or disgusting thing happen 


We use hair dryer and meters look ok, but no damged package or instucton is send sorry


if have problem or want improve hacks please read fix up post by VEEblogs member 'amspire' here:
www.eevblog.com/forum/blog/eevblog-1248-insane-a-0-02-process-meter-for-$9-wtf/msg2730530/?topicseen#msg2730530


next time your order is go by programs drone copter or secure donkey team relay across mountain,
no more water pirate risk and we no use winows 10 again till is fixed   


Warmest regrads from BS Team at Brightest Star Electronic on your new metre !  :)

*plz* sirs, no forgets post good ebay feedback and Like us on Facebook "

 
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Online Brumby

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #266 on: October 10, 2019, 08:12:47 am »
Classic.   ;D
 

Online beanflying

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #267 on: October 10, 2019, 08:14:21 am »
It really is shades of the Dog ate my Homework  :palm:
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline Xenoamor

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #268 on: October 10, 2019, 09:49:20 am »
mine ends in 056YP for what it is worth.

Ending 953CN here.

They've given up sending me excuses now
« Last Edit: October 10, 2019, 11:04:56 am by Xenoamor »
 

Online amspire

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #269 on: October 10, 2019, 11:36:07 am »
I just started a thread under "Test Equipment" for this meter with some basic working code for reading the USB port:

https://www.eevblog.com/forum/testgear/ampx1-process-calibrator-multimeter/msg2732286/#msg2732286
 

Online TurboTom

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #270 on: October 10, 2019, 12:11:03 pm »
This really appears to be a hit an miss business... I must have been one of the first to place an order, still before the "big hype" on 26th of september and my order was listed "shipped" but the tracing information stayed more than ten days on "waiting for pick-up by the carrier" or similar. Today I received this information:

Dear buyer,we are so sorry to tell you that we just got the information from the shipping company that your parcel was lost on the way .we want to resend it for you ,but been told by warehouse the item just sold out .In order to protect your right ,how about we refund to your paypal ?or would you like to choose other item you like in our store?sorry for the trouble and waiting for your quickly reply,nice day .

Could be the truth, could be not. But reading about the other's experiences, I rather believe the initial shipment notification was some bogus information. So you cannot be sure that being early in the queue helps to get delivery. For sure I won't agree to be refunded via PayPal while I paid via CreditCard (...I've also got my principles...). At least this means, "Cozy Life Shop" has got to admit towards AliExpress their mistake.

Considering the whole thing was more a gamble than a real need, I'm okay with that. I anyway got one of these LB-02 calibrators since rather than process control voltages, I need to simulate thermocouple signals, and these won't be generated by the "AIMOsham"...

So good luck to the other "contenders"  ;)
« Last Edit: October 10, 2019, 02:02:43 pm by TurboTom »
 

Online Kosmic

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #271 on: October 10, 2019, 12:40:16 pm »
My order was shipped yesterday. Ordered from "My Cozy Life Store" on September 26 (before the video). If something show up i'm going to be very surprise :)
 

Offline Nusa

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #272 on: October 10, 2019, 01:51:05 pm »
From USPS alerts on the tracking number, looks like my first meter is being delivered today. It will be a bit before I can actually check it out, as I'm currently 2000 miles away dealing with family matters.

(UPDATE: the person collecting my mail while I am gone has confirmed the package was delivered.)
« Last Edit: October 10, 2019, 10:19:21 pm by Nusa »
 

Offline cgroen

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #273 on: October 10, 2019, 01:56:40 pm »
Damn,
guess I was not lucky after all!!
I guess nothing to do ?

 

Online Bud

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Re: EEVblog #1248 - INSANE A 0.02% Process Meter for $9? WTF
« Reply #274 on: October 10, 2019, 02:03:29 pm »
"Security inspection"  :-DD
Facebook-free life and Rigol-free shack.
 


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