Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new RUclips playback feature made the video much noisier than usual.
The unit I received had no solder on the output wires but the case screws were loose. After I soldered the wires to the circuit board the unit works. I bought it to balance lithium cells for assembly. The clock time let's me know the time the output is on.
Hi Kerry first of all thank you for your content. I was just wondering how you changed from CV to CC (current settings and output) on the interface please? Thanks
Edited: to correct manufacturer name in second paragraph. I would like to see a tear down. I’ve seen some pretty unsafe construction in some of the inexpensive Chinese power supplies. The physical power switch on the front is an indication that mains wires are running fairly close to the control board and output terminals. I’d rather see a soft power button on the front and the mains physically isolated in the rear of the instrument. The work-around is to use a plastic rod which extends from the button on the front to a switch mounted inside the cabinet near the mains power inlet on the back. If I recall, I believe I’ve seen that on some Agilent/Keysight equipment. Something that I’d like to see (wasn’t covered in this review) is the ability to program the output to resume the same state as when the unit was last powered on via the mains voltage. Hanmatek gives the option to either always power up in the OFF state for safety or to power up in the previous state. The latter choice is handy if some power supplies are going to be mounted in an automated test equipment rack and you don’t want to require the test technician to have to manually enable the power supplies each time the rack is turned on. Note: Hanmatek mounts the physical power switch on the front panel.
Thank you for the video. I really prefer those king of PS with more intuitive setup i.e, knobs for voltage and current limits. Changing current limits and else on a bench PS in device menus is not intuitive for me, and requires more actions other then troubleshooting other devices. Looks like a good PS though. Thx
My unit ut61e+ range switch is broken. It wasn't subjected to any physical abuse. First the switch lost its ability to snugly fall into each position and day by day it became worse and it doesn't work at all. Anywhere to get a replacement?
My thoughts.... 1) That USB port, is it isolated? 2) The amount of wasted space on that LCD, we know it's a power supply, the brand, the model number is on the back... I have a deja-vu moment atm 3) As someone else mentioned, the OVP & OCP in software is ... not ideal. 4) 5x second digits... that's a lot of seconds lol Unrelated, typo in the video description :P
I checked with meter USB, cabinet and ground terminal connections to output terminals. There is no connections indicated so power supply outputs are isolated from power ground and usb port. How powerful is this isolation? No information. However I couldn't get usb communication with supplied software. No idea how to set port number.
Hi. I purchased I8 n0-20 version. I had perform simple repair because output + terminal was loosy screwed. Access to this was by opening two screw at front bottom and disconnecting power line cable from switch. Cabinet cover screws are so tightly screwed that it was impossible to open there. I am trying to use control software attached on small cd. But I couldn't find how to setup COM number in software. There are some config XML files in software directory, but I couldn't find port number. In attached file with command example states: "Assume the device address is: 1". This address and com speed 9600 is set by default in device menu, but it is nothing common with COM port. Anyway I set port to COM1, but id didn't help as I expected. Anybody succeeded connestion this software to the device?" If yes pls advice.
I expect the ultra slow output voltage change is due to the use of a low frequency PWM DAC with a correspondingly slow low pass filter. The OVP looks to be done in software using the same slow PWM DAC. Pretty useless for protecting electronics but probably fine for battery charging/electrolysis etc. The quality of the firmware is rather suspect though given that it didn't occur to the developers to check the set o/p voltage is less than the OVP! Cheap but I wouldn't trust it to power anything that would be destroyed, or set the house on fire, by the application of 40V @ 7A+ due to a mains glitch/cosmic ray/nearby spark/whatever discombobulating the firmware.
Hi Kerry. First of all, thank you for your videos, they are very helpful for those of us who are just starting out and learning in the world of electronics. I'm thinking of buying a power supply that gives me at least 30V and 20A for repairing laptops and other electronic devices. I have a question about this power supply. Is this device suitable for repairing laptops or other electronic devices, for detecting short circuits, etc.? Are this OVP and OCP safe? I'm a little worried about the voltage/amperage dropping so slowly. As I said, I'm new to this world, I'm studying and learning electronics and I still don't understand many things. Thank you very much in advance and a hug.
It really depends on how much you are willing to spend on a power supply. Many of the entry level switching power supplies have similar issues with the OCP/OVP characteristics like what I have shown in this video. If you are looking for a 30V 20A PS with good load regulation and OCP/OVP, there are many lab power supplies out there meet your criteria but they are expensive (>$500)
@@KerryWongBlog Thank you very much for your answer, my friend. Another doubt that I have with your analysis is: The fact that the power supply is isolated from ground, or at least the current output, what does it mean? That is, what is this for? Is it galvanic isolation? Maybe it has an isolation transformer? And is this safe. Excuse my ignorance, I am quite new to electronics and although I am studying daily, many things still escape me. Thank you very much again, a hug.
Switching power supplies typically use pulse transformers for galvanic isolation. Obviously you should not let the ground float at extreme voltages. A few tens of volts should be no problem.
@@KerryWongBlogThank you very much for your answers and for your help, my friend. I don't know if you tried it, but it can supply 20V and 12A, right?. There are some laptops that need 20V-12A to be able to start, that's why I need a power supply that can reach 20A. I have a 30V-10A one, but it's not enough to start certain computers. I understand that being a 300W source it will not be able to supply more than 20V and 15A, etc. I know that to exceed those voltages and more than 15A, I will need a power supply less than 600W. Thanks in advance and a hug.
OVP & OCP should be enforced in HARDWARE, not software, ....NOT GOOD! I would never trust this kind of power supply for anything other than low cost systems. It is an inexpensive power supply, so you get what you pay for, BUT BUT BUT calling it OVP & OCP is SERIOSULY MISSLEADING!
im with you, i use linear supplies that i build or ones i saved up for. i prefer low noise but i get not everyone can afford a high-end linear supply. the uni-t one that's been making the rounds looks great but it costs more than it's worth, in canada anyway. i like their meters as well and always have ut61+ to donate to people but mod them first to make them safer and their higher end meters make no effort to be third party certified due to horrible input protection (imho), ones i know of anyway. i gave my old smps away and kept one to charge batteries in my garage.
Thank goodness there's another cheap Chinese power supply on the market. There's only about 28,000 different makes and models to choose from on eBay, Amazon and AliExpress! 🤦♂️ 😂
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Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new RUclips playback feature made the video much noisier than usual.
Thanks Kerry, I am always on the lookout for a better supply.
The unit I received had no solder on the output wires but the case screws were loose. After I soldered the wires to the circuit board the unit works. I bought it to balance lithium cells for assembly. The clock time let's me know the time the output is on.
Hi Kerry first of all thank you for your content. I was just wondering how you changed from CV to CC (current settings and output) on the interface please? Thanks
Edited: to correct manufacturer name in second paragraph.
I would like to see a tear down. I’ve seen some pretty unsafe construction in some of the inexpensive Chinese power supplies. The physical power switch on the front is an indication that mains wires are running fairly close to the control board and output terminals. I’d rather see a soft power button on the front and the mains physically isolated in the rear of the instrument. The work-around is to use a plastic rod which extends from the button on the front to a switch mounted inside the cabinet near the mains power inlet on the back. If I recall, I believe I’ve seen that on some Agilent/Keysight equipment.
Something that I’d like to see (wasn’t covered in this review) is the ability to program the output to resume the same state as when the unit was last powered on via the mains voltage. Hanmatek gives the option to either always power up in the OFF state for safety or to power up in the previous state. The latter choice is handy if some power supplies are going to be mounted in an automated test equipment rack and you don’t want to require the test technician to have to manually enable the power supplies each time the rack is turned on.
Note: Hanmatek mounts the physical power switch on the front panel.
Thank you for this video. Can it be controlled by PC? Is there any software for it? Does it show graphs?
Thank you for the video. I really prefer those king of PS with more intuitive setup i.e, knobs for voltage and current limits. Changing current limits and else on a bench PS in device menus is not intuitive for me, and requires more actions other then troubleshooting other devices. Looks like a good PS though. Thx
My unit ut61e+ range switch is broken. It wasn't subjected to any physical abuse. First the switch lost its ability to snugly fall into each position and day by day it became worse and it doesn't work at all. Anywhere to get a replacement?
My thoughts....
1) That USB port, is it isolated?
2) The amount of wasted space on that LCD, we know it's a power supply, the brand, the model number is on the back... I have a deja-vu moment atm
3) As someone else mentioned, the OVP & OCP in software is ... not ideal.
4) 5x second digits... that's a lot of seconds lol
Unrelated, typo in the video description :P
Thanks! Typo corrected :)
I checked with meter USB, cabinet and ground terminal connections to output terminals. There is no connections indicated so power supply outputs are isolated from power ground and usb port. How powerful is this isolation? No information. However I couldn't get usb communication with supplied software. No idea how to set port number.
Hi. I purchased I8 n0-20 version. I had perform simple repair because output + terminal was loosy screwed. Access to this was by opening two screw at front bottom and disconnecting power line cable from switch. Cabinet cover screws are so tightly screwed that it was impossible to open there.
I am trying to use control software attached on small cd. But I couldn't find how to setup COM number in software. There are some config XML files in software directory, but I couldn't find port number. In attached file with command example states: "Assume the device address is: 1". This address and com speed 9600 is set by default in device menu, but it is nothing common with COM port. Anyway I set port to COM1, but id didn't help as I expected.
Anybody succeeded connestion this software to the device?" If yes pls advice.
I expect the ultra slow output voltage change is due to the use of a low frequency PWM DAC with a correspondingly slow low pass filter. The OVP looks to be done in software using the same slow PWM DAC. Pretty useless for protecting electronics but probably fine for battery charging/electrolysis etc. The quality of the firmware is rather suspect though given that it didn't occur to the developers to check the set o/p voltage is less than the OVP!
Cheap but I wouldn't trust it to power anything that would be destroyed, or set the house on fire, by the application of 40V @ 7A+ due to a mains glitch/cosmic ray/nearby spark/whatever discombobulating the firmware.
Thank you for the video!
Isopropyl alcohol will soften thread locker.
Hi Kerry. First of all, thank you for your videos, they are very helpful for those of us who are just starting out and learning in the world of electronics.
I'm thinking of buying a power supply that gives me at least 30V and 20A for repairing laptops and other electronic devices.
I have a question about this power supply. Is this device suitable for repairing laptops or other electronic devices, for detecting short circuits, etc.? Are this OVP and OCP safe? I'm a little worried about the voltage/amperage dropping so slowly.
As I said, I'm new to this world, I'm studying and learning electronics and I still don't understand many things.
Thank you very much in advance and a hug.
It really depends on how much you are willing to spend on a power supply. Many of the entry level switching power supplies have similar issues with the OCP/OVP characteristics like what I have shown in this video. If you are looking for a 30V 20A PS with good load regulation and OCP/OVP, there are many lab power supplies out there meet your criteria but they are expensive (>$500)
@@KerryWongBlog Thank you very much for your answer, my friend.
Another doubt that I have with your analysis is: The fact that the power supply is isolated from ground, or at least the current output, what does it mean? That is, what is this for? Is it galvanic isolation? Maybe it has an isolation transformer? And is this safe.
Excuse my ignorance, I am quite new to electronics and although I am studying daily, many things still escape me.
Thank you very much again, a hug.
Switching power supplies typically use pulse transformers for galvanic isolation. Obviously you should not let the ground float at extreme voltages. A few tens of volts should be no problem.
@@KerryWongBlogThank you very much for your answers and for your help, my friend.
I don't know if you tried it, but it can supply 20V and 12A, right?.
There are some laptops that need 20V-12A to be able to start, that's why I need a power supply that can reach 20A.
I have a 30V-10A one, but it's not enough to start certain computers.
I understand that being a 300W source it will not be able to supply more than 20V and 15A, etc. I know that to exceed those voltages and more than 15A, I will need a power supply less than 600W.
Thanks in advance and a hug.
@@CesarHawk1 Yes it can supply 20V 12A, the PS is smart enough to ensure the setting does not exceeds maximum voltage/current and power constraints.
OVP & OCP should be enforced in HARDWARE, not software, ....NOT GOOD! I would never trust this kind of power supply for anything other than low cost systems. It is an inexpensive power supply, so you get what you pay for, BUT BUT BUT calling it OVP & OCP is SERIOSULY MISSLEADING!
im with you, i use linear supplies that i build or ones i saved up for. i prefer low noise but i get not everyone can afford a high-end linear supply. the uni-t one that's been making the rounds looks great but it costs more than it's worth, in canada anyway. i like their meters as well and always have ut61+ to donate to people but mod them first to make them safer and their higher end meters make no effort to be third party certified due to horrible input protection (imho), ones i know of anyway. i gave my old smps away and kept one to charge batteries in my garage.
Thank goodness there's another cheap Chinese power supply on the market. There's only about 28,000 different makes and models to choose from on eBay, Amazon and AliExpress! 🤦♂️ 😂
testing inexpensive Chinese power supplies with inexpensive Chinese oscilloscope, find the error !