Test/review of YZXStudio USB meter ZY1273

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HKJ
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Test/review of YZXStudio USB meter ZY1273

YZXStudio USB meter ZY1273

DSC_7519

Official specifications:


  • Input voltage: DC 3.5V-24V
  • Input current: +- 5A
  • Voltage resolution: 0.0001V (0.1mV)
  • Current resolution: 0.0001A
  • Cumulative capacity: 0-99999Ah; 0-99999Wh
  • Capacity resolution: 0.0001Ah; 0.0001Wh
  • Accuracy: Voltage 0.1%+2d; Current 0.2%+2d; Ah capacity 0.5%; Wh capacity 0.5%
  • Display: 1.3” 128×104 pixel Colour TFT
  • Update rate: Every 0.36s
  • Idle current consumption: ~8mA / 6mA (with display dimmed / off)
  • Current shunt resistance: 10mOhm
  • Overall circuit resistive loss: ~42mOhm (including contact resistance on USB connectors)
  • Memory: FRAM, good for 10 billion write cycles
  • Memory operation mode: write on every update in cumulative capacity + load balancing technique

I got it from ebay dealer: flyxy2015

YZXStudio makes a series of usb meters with nearly identical specifications, there is also frequent software update with significant improvements. It is possible to install update, but it requires special tools and access to the updated software.
This version has USB 3 and USB Type-C connectors.

yzxCompare

This table compares some of the YZXStudio usb meters.



How does it look

DSC_7517

I got it in a small metal box with a Chinese (I assume) manual, because the user interface is basically the same as all other YZXStudio meters I did not have any problems using it.

DSC_7529

DSC_7520

Notice the small button, it is used for all the functions.

DSC_7522

On this side there is a usb type-c connector for power input (Only one of the inputs can be used at a time).

DSC_7530

DSC_7521DSC_7523


DSC_8210

Welcome screen, it is shown when power is applied (it can be disabled).

DSC_8202

The first screen, it shows V, A, Ah and Wh, the “0” is selected memory bank.
It do also have space for the MCU temperature.

DSC_8203

Next screen shows W and ohm, instead of Ah and Wh.

DSC_8204

On this screen Ah and Wh is with large fonts.

DSC_8205

This screen shows usb coding, voltage, current and time. It also shows the trickle current threshold, only current above this value is summed (Value is configurable).
Note: Sometimes the display will show two usb codings, because it cannot determine which one is valid.

DSC_8206

This screen is used to calculate cable resistance, to use it a constant current load is required.
First do a measure without the cable, hold down the button to set the reference. Then add the cable between the usb power source and the usb meter. The display will show the resistance.

DSC_8207

A chart of current and voltage, sample rate can be configured.

DSC_8208

First page of configuration screen.

DSC_7524

These usb meters are very easy to open, there is only 8 screws to remove.

DSC_7526


DSC_7527

The circuit is fairly simple, it has a microprocessor (32F030F4P6), a FRAM (FM24CL168G), two high resolution adc converters (CAT5), a voltage regulator and the current sense resistor (DALE R012). The microprocessor has an external 12MHz crystal, this makes timekeeping precise.

DSC_7528



Measurements

Voltage

The voltage display is fairly precise with no current flowing (Both voltage and current can be calibrated by the user, I have not changed the calibration).

Current

The current display is also fairly precise and will not change with voltage, except a little bit at very low voltage.


  • The tested usb meter uses software V3.1
  • The voltage readout is within 0.016 volt when unloaded.
  • When loaded the voltage will be closest to the usb input voltage.
  • Current is within 0.002A.
  • The usb meter uses about 12.2mA current with normal brightness, 8.5 when dim.
  • The internal resistance is about 0.085ohm (This includes both connectors).
  • Usb meter will remember measured values when power is removed.


Temp3986

M1: 35,0°C, HS1: 40,8

The above IR photo was taken after 30minutes with 3.5A, during that time the readouts changed very little.

I have not played with the cable resistance function but I expect it to work just as well as the ZY1270



Conclusion

This is a very precise usb meter with many interesting functions. It has good precision.
It is possible to equip the meter with Bluetooth module, this can be used to log data.



Notes

For these USB meters I used precise equipment (Keithley: DMM7510, 2280S, Keysight: 34470A).

How do I make the test

My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

djozz
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Thanks for the test, good to hear this version is good too because I recently bought one Smile

TheBo
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Thanks HKJ, also to confirm me that it has 5A max input  because somewhere it's stated 3A as the other ones.

I was also interested in YZ 1271 but i'm unsure if the extra input will be useful for me. Also some questions if you could  reply:

  1. Is this USB IF PD compliant? I've found it described just for 1271 version
  2. Is this DASH/OPPO coding charge compliant? I've found it is in some chinese sites, i do not expect you to have OPPO/DASH compliant devices (obviously i won't)  but maybe it would be nice if you have some insight, maybe from your seller
  3. Can this version force fast charge as it would with the old yellow 1230 version

Rufusbduck wrote:
Getting discouraged is normal but doesn't finish the job.
Tinderbox UK
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Great review Henrik, love the fingerprint on the second photo`s display.

I wish they would put it in a splash proof case, I suppose they could have sprayed the electronics with a protective coating at least.

 

John.

SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

HKJ
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TheBo wrote:

Thanks HKJ, also to confirm me that it has 5A max input  because somewhere it’s stated 3A as the other ones.


I was also interested in YZ 1271 but i’m unsure if the extra input will be useful for me. Also some questions if you could  reply:

  1. Is this USB IF PD compliant? I’ve found it described just for 1271 version

I doubt it do more than add a resistor.

TheBo wrote:
  • Is this DASH/OPPO coding charge compliant? I’ve found it is in some chinese sites, i do not expect you to have OPPO/DASH compliant devices (obviously i won’t)  but maybe it would be nice if you have some insight, maybe from your seller
  • I also doubt that, it requires special usb connectors.

    TheBo wrote:
  • Can this version force fast charge as it would with the old yellow 1230 version
  • No.

    My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

    maukka
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    Thanks a lot! Somehow I missed the release of this.

    maukka
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    The ZY1271 seems very interesting as well. Has the large TFT display like the 1270 but also USB-C in and out in addition to Type A and Micro-USB in.

    TheBo
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    Yep!, Seems their top of the line but it doesn't matchUSB 3.0 standard, not an issue to me since you rarely will be using this to monitor current while data transferring, IMHO and even so you can get an idea with USB2.0.

    I would have both the 1271 if it wasn't the most expensive.

     

    I would thank HKJ for this review, once again, very often when i want to buy something to feed my geek instincts i found a nice review from him.

     

    Also i would like to verify the VOOC/DASH charging thing with my OP3 once my 1273 arrives because in this table from their sit (at least what i think it should be their site) shows DASH capable. And since DASH has a max current of 4Amp, it could fit in their 5A version, but i guess on the other hand HKJ could have its point with the missing pins from the Type C connector. Don't know, I will check it out

     

    ------------------------------------------------------EDIT---------------------------------------------------------------

    Also if you check this other product https://world.taobao.com/item/522642875491.htm?fromSite=main&spm=a312a.7700824.w4004-11726212606.8.BUDA6y

    they clearly state VOOC and DASH, if someone ever trust chinese descriptions....  Smile

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    maukka
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    The new digitally controlled dc load ZL1100 is also cool. I always hated the trimmer pot of the ZL1000.

    edit: heh, you just added the ZL1100 link, oh well

    edit2: Franky also has it listed on his ebay store I’d like YZXStudio to supply it with a serial logger program much like the EB tester software that is able to program their loads.

    TheBo
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    maukka wrote:
    edit: heh, you just added the ZL1100 link, oh well

     

    it has never been an issue to share link of online shops, it is not against the rules

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    maukka
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    TheBo wrote:

    maukka wrote:
    edit: heh, you just added the ZL1100 link, oh well

     


    it has never been an issue to share link of online shops, it is not against the rules

    No of course not, I just didn’t see the mention of the ZL1100 before I started to type my message.

    HKJ
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    maukka wrote:
    The new digitally controlled dc load ZL1100 is also cool. I always hated the trimmer pot of the ZL1000.

    The ZL1100 looks interesting, but is sold out. I have a couple of the ZL1000 load and all is the version without trimpot, the only one with trimpot I have is the one I reviewed and I usual do not use that one.

    My website with reviews of many chargers and batteries (More than 1000): http://lygte-info.dk/

    dodge_911
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    Nice review, once again Big Smile More stuff to put on my wanted-list for testing materials...

    But I have to say that the new ZL-1100 is pricey imho. But I'm getting one, I think.

    I'm getting a ZY1271, I think, but I'm still looking at the ZY1273 reviewd here too...

    What would be the best for testing USB-C stuff, like I use for testing my micro-usb cables?

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    TheBo
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    since it has both typeC and uUSB i think your best bet is staying with 1271

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    dodge_911
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    TheBo wrote:

    since it has both typeC and uUSB i think your best bet is staying with 1271

    Oh, I forgot to mention, I already own a 1230, 1231, 1266 and 1270, so micro-usb is not THAT important.

    But I want to do passthrough measurements, so it'll be the 1271 I guess...

    :: youtube ::
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    :: blog ::
    http://bit.ly/dodgereviewstmb
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    :: μusb cable resistance tests ::
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    :: lightning cable resistance tests ::
    http://bit.ly/drlightning
     :: type-C cable resistance tests ::
    http://bit.ly/drtypec

     

    TheBo
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    Arrived to me few moments ago, i think it was worth to share that indeed it is VOOC/DASH compliant

     

    W0GQ9RB
    image upload

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    Tinderbox UK
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    Does anybody have a link where i can buy a reasonably priced one of these usb power meters.

     

    John.

    SkyRC MC3000 – Maha C9000 – LaCrosse BC-900 – Floureon BT-C3100 V2.2 – Accumanger 10 and 20 -Thunder AC6 LiitoKala Lii-100 – Cozypony 24W Solar Panel – Soshine H4 – Soshine T2 – Soshine E4S

    TheBo
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    Imho reasonably... Nowhere. 

    The cheapest I could find mine was from ebay 19.87 usd for the meter plus few cent less than 10usd for shipping 

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    djozz
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    About 30 dollar is what I payed too.

    TheBo
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    Ok, I got few questions now, seems my unit is not able to set some of the parameters I have available in the options, to be more precise I cannot set any of the option from 14 to 19 (14 and 19 included) which are

    14.Trickle charge current

    15.Trickle charge delay

    16.Over current protection 

    17.Under voltage protection 

    18.Over voltage protection 

    19.Over temperature protection 

     

    Withouth these the meter is just a normal meter with higher resolution 

     

    My fw is 3.30 Y1273 could someone check in his for me? Also if someone has the English manual and could share it somewhere would be great... 

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    dodge_911
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    Got my YZ1271 and ZL1100 yesterday.

    Haven't got a manual yet, so I need to figure out how they work.

    But I've found something weird :

    The current on the load does not match the current on the meter undecided

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    :: lightning cable resistance tests ::
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     :: type-C cable resistance tests ::
    http://bit.ly/drtypec

     

    TheBo
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    Now that i have my zy1273 i can say i like yours much more.

    Anyway, if you have a decent multimeter and a USB plugs with terminals you could measure current and say which one is off.

    Otherwise you could roughly say it by attaching an Android phone (i don't know anything about ios) with an app called Ampere or another called Accubattery, which measures fairly well (considering that is just an approximation) how much current it is flowing through the phone. This at least, considering the big difference in numbers will tell you which one to trust and which one recalibrate (if possible)

    I don't know if yours can recalibrate i'm pretty sure 1273 is not thatconfigurable (pretty disappointed by it)

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    maukka
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    Something’s definitely up. Mine is fine with the ZY1271.

    dodge_911
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    TheBo wrote:

    Now that i have my zy1273 i can say i like yours much more.

    Anyway, if you have a decent multimeter and a USB plugs with terminals you could measure current and say which one is off.

    Otherwise you could roughly say it by attaching an Android phone (i don't know anything about ios) with an app called Ampere or another called Accubattery, which measures fairly well (considering that is just an approximation) how much current it is flowing through the phone. This at least, considering the big difference in numbers will tell you which one to trust and which one recalibrate (if possible)

    I don't know if yours can recalibrate i'm pretty sure 1273 is not thatconfigurable (pretty disappointed by it)

    I own multiple YZXStudio's meters, which were all calibrated when I got them, and they all show the same difference between load and meter. I believe they can be recalibrated. Good thing I bought mine at Franky's eBay store, he's usually really good about these kinds of things.

    maukka wrote:
    Something's definitely up. Mine is fine with the ZY1271.

    Thanks, now I know I'm not going nuts Smile

    :: youtube ::
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    :: blog ::
    http://bit.ly/dodgereviewstmb
      :: powerbank capacity tests ::
    http://bit.ly/drpbcc
    :: μusb cable resistance tests ::
    http://bit.ly/drmicrousb
    :: lightning cable resistance tests ::
    http://bit.ly/drlightning
     :: type-C cable resistance tests ::
    http://bit.ly/drtypec

     

    TheBo
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    dodge_911 wrote:

     

    I own multiple YZXStudio's meters, which were all calibrated when I got them, and they all show the same difference between load and meter. I believe they can be recalibrated. Good thing I bought mine at Franky's eBay store, he's usually really good about these kinds of things.

    I meant user recalibrated, let's say you have proper DMM (like a top of the line Brymen, Fluke, Agilent) or a bench type you could use as reference, also a bench type Electronic load, you could recalibrate your own like some other stuff allows you to.

    dodge_911 wrote:
    they all show the same difference between load and meter

    So, must be the load?

    Rufusbduck wrote:
    Getting discouraged is normal but doesn't finish the job.
    maukka
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    The ZL1100 does allow for current calibration so you could try that to match you ZY meters if you have a stable 2.7 amp power supply.

    dodge_911
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    maukka wrote:
    The ZL1100 does allow for current calibration so you could try that to match you ZY meters if you have a stable 2.7 amp power supply.

    Haven't got that kind of precision equipment, I'm sad to say.

    We should make some kind of general chit-chat thread about these kind of things, so we don't litter this review's thread too much.

    :: youtube ::
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    :: blog ::
    http://bit.ly/dodgereviewstmb
      :: powerbank capacity tests ::
    http://bit.ly/drpbcc
    :: μusb cable resistance tests ::
    http://bit.ly/drmicrousb
    :: lightning cable resistance tests ::
    http://bit.ly/drlightning
     :: type-C cable resistance tests ::
    http://bit.ly/drtypec

     

    maukka
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    You don’t need a lab power supply for that. I bet one of your many usb chargers has enough juice to put out 2.7 amps. Just put the ZY1271 in between the charger and load like in your video to check the current. There’s a Curr ref menu option in which you enter the current you see on the 1271.

    dodge_911
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    maukka wrote:
    You don't need a lab power supply for that. I bet one of your many usb chargers has enough juice to put out 2.7 amps. Just put the ZY1271 in between the charger and load like in your video to check the current. There's a Curr ref menu option in which you enter the current you see on the 1271.

    Thanks for the advice man, this solved the issue.

    :: youtube ::
    http://bit.ly/dodgereviewsyt
    :: blog ::
    http://bit.ly/dodgereviewstmb
      :: powerbank capacity tests ::
    http://bit.ly/drpbcc
    :: μusb cable resistance tests ::
    http://bit.ly/drmicrousb
    :: lightning cable resistance tests ::
    http://bit.ly/drlightning
     :: type-C cable resistance tests ::
    http://bit.ly/drtypec