Shizuku / AVHzY CT-3 / Power-Z KT002 / Atorch UT18 USB Tester Тестер テスター 테스터기 測試器 Quick Demo

[@CarstenBauer]

Thank you for this demo video, it explains how to use the KT002. Question, how do you use the cable resistance tool?

[@magicmeter4064]

Hi there, It would be like this usbchargingblog.wordpress.com/2021/07/07/how-to-properly-test-a-3a-60w-or-5a-100w-usb-type-c-cable-with-any-usb-tester/

[@akmuenster]

Dear Magicmeter, thanks for your great videos!! Is it possible to 4 wire measure the IR of 18650 batterys with this device from Shizuku/AVHzY ? And is it possible to do cycle tests with 18650 cells (automatic load and unload 18650 cells in long rows (100 times)) with this device an the mounted SM-LD-00 ? Best Regards!

[@magicmeter4064]

Hello Andreas, It's probably not capable to. First, the range of Dp and Dm lines is only 3.3V. Second, the voltage measurements of Dp and Dm are not accurate enough. Have a nice one!

[@akmuenster]

@@magicmeter4064 Thanks for your answer!

[@kirilloffs]

Hi. Thanks for the video and informative review on your site. I saw in the review that you had external temperature sensor connected. But i wasn`t able to see a socked. Where is it connected? Can temperature measurements be recorded? Is temperature probe available for AVHzY CT-3?

[@magicmeter4064]

The socket is on the load module. And yes, the temperature can be recorded but it's only available if the load module is installed. The probe comes with the load module.

[@kirilloffs]

@@magicmeter4064 Thank you!

[@giedriusbev4200]

Hi, you seem to be very knowledgeable about this meter. I have the same one with the load module. Have been trying to work out what Enable Soft Dash Cable does? Also i was hoping that the load module could be used in testing cable resistance but it doesn't seem to be the case. I start load module at 1A and plug male USB A to the charger and then it does nothing. Or i can only use it with another dummy load in order to test cables? thank you.

[@magicmeter4064]

- What Enable Soft Dash Cable does? Vooc/Dash/Warp charging protocol happens only when a Dash cable presents. You may see this function as a Dash cable emulator and use it to charge your OnePlus devices when you don't have a Dash cable. - Also i was hoping that the load module could be used in testing cable resistance Yes, the Bypass (C-C Only) method works and you could just follow the instruction. Also make sure to use a cv power source or at least a power adapter with no voltage compensation, and power the meter via its PC port with a separate power supply at the same time. However, the Normal (A-C Only) method doesn't seem to be suitable for the load module.

[@giedriusbev4200]

@@magicmeter4064 thank you very much for the information. I was under impression that Enable Soft Dash would "fake" the tester port to behave as a Dash output. Meaning if input is day 100w in, it would then output Dash in the output. But from what you wrote it just simulates the cable. Thank you for the explanation on how to do the cable testing. Indeed I tried C-C works with the attached load. But have bought dummy load to do it properly for A-C tests. Great to see someone with such deep knowledge on those testers! Take care

[@gordo8189]

Hi Magicmeter, this is very informative, thanks for taking the time (and on your blog).. I can see from your demo that the meter is using D+ & D- as sense wires in a classic 4-wire resistance measurement (with D+ being the more negative, which is unfortunate). It seems it would be simple enough to short D+ to ground and D- to Vcc on the socket at the far end of the cable (also fitted with a 5 ohm resistor) and measure the combined voltage drop across both supply and ground wires, since this is a relevant metric when grading cables. This way, I could have type B, type C and microUSB sockets, each fitted with a resistor and test any type of cable - heck, I could even make adapters & grade IEC mains cables with it. As things stand, I think I'd be calculating the load resistance, but since Vcc is also measured at the meter, it should be possible to derive both supply and ground resistances in a cable. Do you know if this mode is supported by the AVHzY meter or is it something that would require a LUA script?

[@magicmeter4064]

Hello Gordo, good questions! The reason why D+ is more negative is to be compatible with other USB meters. Therefore, owners of other USB meters can use this method directly without any modification. In the case shown in the video, D+ & D- should only be connected to the ends of the R050 resistor because we only want to measure the resistance of this resistor. If we short D+ to ground and D- to Vcc on the socket at the far end of the cable, some unwanted resistance will be included. However, I guess this kzbin.info/www/bejne/nIitea2He7iSa8U may be of interest to you. You may want to make a USB 4-wire adapter, a USB Type-C module, and a USB Type-A module. For the USB Type-A module, no switch needed, you may want to short D+ and D- to the ground pin and the Vcc pin of the USB-A receptacle. That is similar to what you mentioned, and it works with any usb cable and almost any USB tester but does not require LUA scripts. There is also a LUA script dedicated to CT-3.

[@gordo8189]

@@magicmeter4064 I wasn't aware of the D+ being negative thing; useful to know. What I'm thinking of is something along these lines.. drive.google.com/file/d/1ehgY6T5q9fld-QOAVKbR9-lV87ZnhR4T/view?usp=sharing As I understand it, the way things stand my proposed configuration would accurately measure the load resistance (Vd- minus Vd+)/I.test ignoring the resistance of the power leads, which is the opposite to what I want. The formula in the diagram would directly give the combined lead resistance, but I suspect a LUA script may be required for that. I could read the resistance of the Vcc and ground cables with no change to the code by adding a toggle switch at each end of the cable under test, but that would require additional hardware at the meter end and would provide 2 separate readings which would have to be added together. With different code, I'd require only one adaptor for each type of cable (A/B/C/micro - type A for extension cables) and could read off the cable resistance directly. I'm imagining a LUA script which allows cable length to be selected from a list then grades the cable on a scale of say, 1 to 5 depending on the combined cable resistance (a TDR built into the meter would allow the cable length to be measured, but let's start small). A bar graph along the bottom could act as a trend indicator showing resistance in real time (provided refreshes could be made frequent enough) allowing the cable to be moved in its socket to help identify cable fray faults or poor plug/socket connections. I've a few decades of application/embedded design experience but have never used LUA - can you recommend how I might get up to speed with LUA programming for the CT-3 meter. The file on your Google drive appears to be some sort of bytecode, but probably wouldn't help me anyway. I'm imagining there are data objects in LUA for querying the various voltages & currents, functions for initiating a read etc. I looked at the AVHzY website but details are sparse, so any pointers would be greatly appreciated..

[@magicmeter4064]

@@gordo8189 Your idea is definitely clear and right. However, when applying to a USB meter, it's not very reliable. The main problem lies in the USB meter itself. Here the simulation of your configuration. usbchargingblog.files.wordpress.com/2021/08/p1.png R_result = R_USB_A_CONTACT_1 + R_VCC + R_USB_C_CONTACT_1 + R_USB_A_CONTACT_2 + R_GND + R_USB_C_CONTACT_2 = 10 + 20 + 10 + 10 + 20 + 10 = 80 mOhm. (Vcc - Vdm + Vdp)/Itest = (4.966-4.929+0.047)/1.039 = 80.8 mOhm. Close enough. If you use the reading of the voltage on the USB meter as Vcc, it will be (4.989-4.929+0.047)/1.039 = 103 mOhm because SHUNT, R_PCB_1, and R_PCB_2 (22 mOhm in summary) are included. That's the unwanted resistance I mentioned before, but no problem at all since your goal is to grade the cables. The issue is the voltage at D-: it's already over range. The D+&- voltage range of many USB meters is only about 3.3V. Exceeding this range may cause reading errors, system crashes, and other weird behaviors. But I don’t know if CT-3 will still function normally in this situation. This my USB Type-A module. One module for all types of cable you'd like to test. usbchargingblog.files.wordpress.com/2021/08/p2.png It's applicable regardless of whether the USB meter has a built-in 4-wire measurement method and the result is accurate enough. usbchargingblog.files.wordpress.com/2021/08/p3.png Yes, the file with the lc extension is a bytecode file because it requires less resources to execute and is user-oriented... Below are links to the source code of two lua script examples. drive.google.com/file/d/1SwPmj9OQpya_-Zhwbg5WajYu39zzWxas/view?usp=sharing drive.google.com/file/d/1MQ1vK_r6icKb7VYDEQdJS8LIOkxF6oG6/view?usp=sharing There are more examples in the LUA tab of the PC software. It will show up when you connect your CT-3 to your PC. yk-lab.org:666/index.php/shizuku-pc-software/ It basically has some built-in methods instead of class/object to call to get the readings. LUA is similar to Python. It's very flexible and easy to learn. It's also supported by some benchtop multimeters. Execute Lua Online: www.tutorialspoint.com/execute_lua_online.php

[@gordo8189]

@@magicmeter4064 Thanks for that, all very useful. I had envisaged Vcc D+ and D- inputs being sampled by a single ADC in the meter via some kind of multiplexer and all able to read 0-26 Volts, but, of course, that may not be the case, and D+/D- could be a differential pair limited to the SoC supply voltage. Currently, I'm concentrating on the AVHzY CT-3 meter and the LUA scripting as it sounds very interesting - plus the transmitter for my drone is programmable using LUA so I need to learn a bit! I will install the AVHzY application on a Windows PC (I use Linux mostly) and check out the LUA programming examples. I have a 6.5 digit multimeter and precision voltage source, so I'll carry out some tests on the D+ and D- inputs of the CT-3 to see what they are capable of. Once I've figured it out I'll leave a comment here and let you know what I discover.

[@magicmeter4064]

@@gordo8189 Hey Gordo, Notification received but don't know why your comment doesn't show up. So I reply here. "Hi Magicmeter... I've built my cable tester add-on for the CT-3 - it can test A-mini, A-micro, A-C and C-C cables. You're right, the data lines can only measure up to 3.3V so I added a resistive divider to scale the 5V to 3.2V. I've tested a bunch of cables of varying quality and the results are similar to those of my AliExpress USB cable tester - certainly close enough to grade a cable if its length is known. Here are some photos and the schematic. drive.google.com/drive/folders/1MyEdmevf0JtP8e9pdH0h9bK0gDDh0zao?usp=sharing I would now like to write a Lua script to automate the calculation. I downloaded the PC software for the CT-3 and looked at the sample Lua scripts but I can't see any way to read the state of the scroll-wheel or, better still, create a callback when the user interacts with it. Do you know if this is doable?" Everything looks good! Sadly it cannot access the status of the scroll wheel. But there are two methods related to the scroll wheel: screen.popYesOrNo() and screen.popMenu(). Not very helpful though. Maybe try to prompt something like "Press the button to test", and then display the result after the user presses the test button, and then reset the screen when the user unplugs the cable.

[@jacek7178]

super video. Are Shizuku and AVHzY CT-3 the same? Regards

[@magicmeter4064]

Yes, they are the same.

[@jacek7178]

@@magicmeter4064 Thanks!