Author Topic: Another cheapo multimeter: 19999 count, 0.05% DC accuracy  (Read 50848 times)

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Offline joeqsmith

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #25 on: March 22, 2018, 12:16:08 am »
Same old story.  Vias in the switch pads, input routed directly to the switch with the PTC and clamp on the backside and looks like there could be problems again with the current inputs.  But is does have a CAT IV rating.  Must be good.

Offline floobydust

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #26 on: March 22, 2018, 12:57:43 am »
They brought out the serial TX pin 20  :popcorn: PT1.7 is pin 17, RX is pin 21. Have to see if the firmware sends anything out.
ZT219 using Hycon HY12P again?
 

Offline rhb

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #27 on: March 22, 2018, 01:14:02 am »
Mine arrived yesterday, took it out of the packet and fitted 2 x AA batteries - it turns on and I see stuff on the display which is nice and clear (and BIG - good for my old eyes).  I'll do some more tests and report back. Let me know if you want something specific tested - I have a calibrated 6.5 digit Keysight for comparison - LOL, a $22 (shipped) meter Vs a $1,000 meter!

How about hooking the 2 meters to a voltage reference if you have one, or a bench supply if you don't,  and post some comparisons  on all the ranges.  If you use a bench supply include a scope trace.  Same thing with other measurement modes.
 

Online Fungus

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #28 on: March 22, 2018, 06:03:31 am »
How many mA does it put through a white LED?
 

Offline Gandalf_Sr

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #29 on: March 22, 2018, 09:56:09 am »
How about hooking the 2 meters to a voltage reference if you have one, or a bench supply if you don't,  and post some comparisons  on all the ranges.  If you use a bench supply include a scope trace.  Same thing with other measurement modes.
I did that yesterday, almost spot on in comparison with my Keysight meter on volts.
If at first you don't succeed, get a bigger hammer
 

Offline Stinger

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #30 on: March 25, 2018, 07:42:33 pm »
Same old story.  Vias in the switch pads, input routed directly to the switch with the PTC and clamp on the backside and looks like there could be problems again with the current inputs.  But is does have a CAT IV rating.  Must be good.
Hello,

Thanks for your videos. :clap:

Are AN870 have bug reading like AN860 when switching DC to AC ?

https://youtu.be/4PjmFqzlfLc?t=26m00s
 

Offline TheInfernoMan

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #31 on: March 28, 2018, 10:54:12 am »
Hello I have received my AN870 today,

I checked the ac bandwith with a Sine Wave 1Vpp and so in my calculation the Vrms is 0.353V
I have measured a value of 0.367Vac with the AN870 (this error is most likely because of my frequency generator).
The -3dB point of 0.259Vac is with my AN870 at 3.02kHz not better than my Aneng AN8001.

I've also checked the diode mode and the open circuit voltage of the AN870 in diode mode is 3.255V and the short circuit current is 1.82mA.

Are there other tests I can do without special equipment?
What I am happy about the AN870 is the auto range function, I think it is faster than my Aneng AN8001, but at the moment I havent measured the speed.

Thanks in advance and sorry for my bad english,
TheInfernoMan
 
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Offline Stinger

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #32 on: March 28, 2018, 04:29:31 pm »
Hello,

Can you test if your new DMM have bug display when change DC to AC ?

https://youtu.be/4PjmFqzlfLc?t=26m00s
 

Offline TheInfernoMan

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #33 on: March 28, 2018, 06:00:33 pm »
While testing the AN870 I found a problem with the auto range function. I think this is a bug.

The first picture shows the sine wave signal (5Vpp, 50Hz, no offset) and the AN870 reads without a problem.

If I offset the sine wave with 2.5Vdc (second picture) the AN870 cant find the right range in Vac Mode. See the video for demonstration.

The AN8001 reads just fine.

Demonstration Video: https://youtu.be/C9V6pa3hWxg
 
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Offline Johnboy

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #34 on: April 12, 2018, 04:47:20 pm »
My first reaction was "Ah - it's finally been spotted in the wild!" - see the ante-penultimate paragraph of this post:

https://www.eevblog.com/forum/beginners/opinion-on-a-bside-zt302-multimeter/msg1344853/#msg1344853

But the more I look, it seems like a 19,999-count version of the AN860B, rather than a 19,999-count version of the ZT301. It appears to have a separate holster (good), but if it's the same size as the AN860B, that's quite a large meter, as my pictures show - practically Fluke 87V size. Personally, I quite like the small size of the ZT301.

I see it's available on eBay UK for £27 - thanks for the pointer :-+

Meanwhile, has anyone seen the 19,999-count of the ZT301 yet? The BSIDE website is of little help, needless to say.


Yes, it has arrived.

http://zotektools.com/products-2/zt303/

Looks like the recent AN870 may have some "competition" in the confusingly-similar, mystical world of cheaply-built Chinese multimeters.
 

Online Fungus

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #35 on: April 12, 2018, 08:46:20 pm »
Yes, it has arrived.

http://zotektools.com/products-2/zt303/

Looks like the recent AN870 may have some "competition" in the confusingly-similar, mystical world of cheaply-built Chinese multimeters.

DC voltage accuracy 0.5%??  :o

(on that page and in the downloadable manual)
 

Offline Johnboy

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #36 on: April 13, 2018, 01:59:22 am »
Yikes. Well, the spec claims for accuracy are definitely on the side of the Aneng... 
 

Online Fungus

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #37 on: April 13, 2018, 09:53:30 am »
Yikes. Well, the spec claims for accuracy are definitely on the side of the Aneng...

Maybe they're just covering their asses.

ANENG and Zotek both seem to sell the exact same models, I'm betting they're branches of the same company. Anybody know the story?

In that case it might be that they want ANENG to be the main brand so they deliberately put lower specs on the Zoteks. Who knows? :-//

nb. Zotek appear to have the AN870: http://zotektools.com/products-2/zt219/

Weird that ANENG doesn't have the ZT103 equivalent yet.

-------------------------------------------------------------------------------

They do a 15B+ and a 17B+ model. I wonder where they copied those model numbers from...  :palm:

« Last Edit: April 13, 2018, 09:58:37 am by Fungus »
 

Offline HKJ

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #38 on: April 13, 2018, 10:00:18 am »
When you look at the circuit board of these meters they have a ZTxxx type number, probably because they are all made by Zotek.
 

Offline 001

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #39 on: April 13, 2018, 10:06:30 am »
What about speed of this new 19999 count beauty?
 

Offline precaud

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #40 on: April 13, 2018, 12:11:43 pm »
When you look at the circuit board of these meters they have a ZTxxx type number, probably because they are all made by Zotek.

I agree. The facts on this and other meters suggest that Zotek is the manufacturer; and Aneng, Bside, and others are sales and marketing companies.
 

Online Fungus

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #41 on: April 13, 2018, 12:25:03 pm »
When you look at the circuit board of these meters they have a ZTxxx type number, probably because they are all made by Zotek.

I agree. The facts on this and other meters suggest that Zotek is the manufacturer; and Aneng, Bside, and others are sales and marketing companies.

I've noticed that there's a weird dull patch on the plastic just below the "OFF" position on my AN860B+. It's also present on the other brands, eg. You can see it here in joe's review of the Kasuntest variant:



This makes me think they all come out of the same machine.


Edit: Yep, it's on the Zoteks, too. I can see it in Youtube videos:

(OK, not easy to see in that frame but it's very obvious in the video. I wanted a frame where you could see the splodge and the Zotek branding at the top which isn't easy when the cameraman is insane).

DoubleEdit: Also Zhiaoxin brand:

« Last Edit: April 13, 2018, 01:04:52 pm by Fungus »
 

Offline Johnboy

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #42 on: April 13, 2018, 02:56:33 pm »
In a side-by-side comparison, the ZT219's claimed accuracy specs trump the ZT303's in every respect but Megohms at the top of the range. The ZT303 is only rated up to 10A, while the ZT219 covers twice that. The position of the ZT219 on Zotek's product page suggests that it is their current "flagship" product (cough, cough) and probably their newest design. The ZT303 is being offered at the same price point by the Zoyi brand, but my suspicion is that most of the sellers (Aneng and others) decided to pass on the ZT303 and brand the ZT219 instead (it also has an additional dedicated voltage switch position and temperature measurement). Under the hood, the AN870 will almost certainly have "ZT219" printed on the circuit board.
 

Offline HKJ

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #43 on: April 13, 2018, 03:53:38 pm »
The ZT303 is only rated up to 10A, while the ZT219 covers twice that.

Only on paper, reading is not stable.

Under the hood, the AN870 will almost certainly have "ZT219" printed on the circuit board.

It have: ZT219 V0.4
 

Offline HKJ

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #44 on: April 17, 2018, 02:46:16 pm »
I put up a review of AN870: http://lygte-info.dk/review/DMMAnengAN870%20UK.html

As usual it includes my schema with functions, have measured a lot of stuff and do a tear down.
 
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Offline 001

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #45 on: April 17, 2018, 04:46:06 pm »
Thanx a lot!

Can You compare an860b+ vs An870?

An870 pros: 19999 counts
An870 contra: ac+dc voltage fail, zero cross at Hz/%


Is  an860b+ more usable unit it all?

What about continuity and autorange speed?

PS -- You sad what 860 input is not protected  and wires directly connect chip
But An8002 etc  can survive after 2kV  test
Is circuit is same ?
« Last Edit: April 17, 2018, 04:50:57 pm by 001 »
 
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Offline HKJ

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #46 on: April 17, 2018, 05:20:38 pm »
They are very similar meters, the AN870 has better resolution and this also means it has one digit extra in resolution in the lowest ranges (1uV (Below u5V is clamped to 0) & 10nA). The AN870 can measure higher ohms values and higher frequencies, but most people will probably not have anything to use that difference for. The specified tolerances are better to AN870

I have compare autorange speed for ohms, but I it is difficult to measure speed for voltage.

These meters all use basically the same protection: 10Mohm or 1Mohm (Depends on range) directly into the chip, then the chip must handle the over current/voltage. Input pins can usual handle a few mA, and 2kV is only 2mA through 1Mohm (Any capacity in the resistor is fairly bad for the chip with fast transients).
 
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Offline Candid

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #47 on: April 17, 2018, 05:45:53 pm »
I put up a review of AN870: http://lygte-info.dk/review/DMMAnengAN870%20UK.html

As usual it includes my schema with functions, have measured a lot of stuff and do a tear down.
Thank you. The first teardown big picture is missing

"Not Found

The requested URL /pic/Aneng/AN870/DSC_7490a.jpg was not found on this server."
 

Online Fungus

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #48 on: April 17, 2018, 05:54:57 pm »
They are very similar meters, the AN870 has better resolution and this also means it has one digit extra in resolution in the lowest ranges (1uV (Below u5V is clamped to 0) & 10nA).

Thanks for all the info!

They look very similar to me. The AN870 seems to have about twice the usable frequency for TrueRMS, half a digit extra on most measurements, otherwise very similar.

It costs more, you get more.  :popcorn:

For me I don't think the difference is enough to discard my 860B+, I'll keep mine for now but if/when it dies the 870 looks like a good candidate to replace it.

Protection will be about the same, too. The most important thing is to make sure it's in volts range when you do something risky.

PS: how well does the NCV tester work? Can it detect wires in walls?
 

Offline edmundopt

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Re: Another cheapo multimeter: 19999 count, 0.05% DC accuracy
« Reply #49 on: April 17, 2018, 06:06:52 pm »
so, since the price is about the same :
what to choose :
 AN870/ZT219/RM219 or
 Zeast282 / SURPEER AV4

the Zeast 282 states that is 0.05% but according to
 http://lygte-info.dk/review/DMMZeast282%20UK.html and https://lygte-info.dk/review/DMMAnengAN870%20UK.html
they are close, battery life is not important since I am interested in this for a 3rd  meter, small eletronics only
« Last Edit: April 17, 2018, 06:13:07 pm by edmundopt »
 


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