I only do things in the 3.3 to 5v range and usually under a few amps so I like the fact you got to push the voltage/current selector to make changes cause I can see my little grand-daughter sneaking up on me and moving those dials.
I just toasted my second device with this power supply. If you arent super Careful while adjusting the voltage, you can instantly go to 20v then 30v directly into your device.
I have had mine for 3+ years, have used it all across the scale. A lot of Li-on charging. 4.2v to 29.8v. I have a lot of hours on it, and it keeps on doing me good l.o.l.. I was sceptical because of the price, but recommend this to any serious hobbyist or school lab. You get used to pushing the buttons really fast. Hope this helps someone.
The New multimeters have built in NCV non contact voltage, VFC variable frequency interface, VFD filter for motor signal. I'm not sure if the NCV can measure DC voltage on wires that are hidden in pipes or wooden walls or its just only for AC voltages. The VFC i don't understand what it is but I'm guessing when you switch the AC line frequency the VFC circuit can measure the AC voltage. The VFD filter is for motor signals which I don't understand also what a VFD filter would do used for what motor signals. Do you know what VFC and VFD is and used for?
NCV is only for AC. A VFD rapidly switches the voltage on and off usually at many times the fundamental frequency. The switching occurs in a special way that when averaged the output is a sine wave. Look into how a VFD works. The VFD function of the meter is a low pass filter that can reject the switching and allow the measuring of the fundamental frequency.
When you turn it off, or if the main power shuts down for a couple minutes, it will remember the Voltage and Current you set up? Or at least the voltage will go to zero?
Is you have wires running through metal pipes how can you measure to check if you have DC voltages if the NCV only measures AC voltages in wooden walls and wires in metal pipes? Yes i will look into how VFD works but I'm confused why the DVM meter needs a VFD filter when the averaged output is a sinewave. I'm guessing with noise and interference's on the motor signals averaged sinewave output.
NCV is a tool for house wiring that allows you to know if it is safe to cut a hole in a wall or drill a hole. If you hit one of those lines it may kill you. Unless it is special in some way, there are no DC setups besides low voltage DC. Damaging low voltage DC lines is annoying but not dangerous. It's not the noise but the frequency. There are two frequencies on top of each other. The fundamental sine wave and the switching frequency. The meter has no good way of knowing which one you are trying to measure. The VFD feature cuts off the high switching frequency allowing the meter to "lock on" to the fundamental sine.
@@eapbg, Why does a VFD circuit output the fundamental frequency plus the high switching frequency? A VFD circuit converts AC to DC and converts DC back to AC, but the AC output has the fundamental frequency plus the high switching frequency? I'm surprised the AC motor doesn't get confused which speed frequency to use
@@billwilliams6338 A VFD turns DC back into AC by modulating the switching in such a way that when averaged the result is roughly a sine wave. I'm stating this very generally and I would suggest reading up on VFD theory. A motor has an inductance that acts as a low pass filter. The switching frequency of the VFD is usually at least 10 times if not 100 times greater than the fundamental frequency they are trying to achieve. The low pass filter type effect averages the switching frequency only leaving the fundamental frequency.
Funny how you equate smart thinking with expensive power supplies. Smart thing shouldn't come at greater cost if you want to sell a nice product. I'm talking about the logic used in the micro controller.
Funny you should say that. Recently I've been using this supply with a Keysight 34465A 6.5 digit DMM. At 30V it is only 20mV off. Below 10V it is only 5mV off.
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I only do things in the 3.3 to 5v range and usually under a few amps so I like the fact you got to push the voltage/current selector to make changes cause I can see my little grand-daughter sneaking up on me and moving those dials.
I just toasted my second device with this power supply. If you arent super Careful while adjusting the voltage, you can instantly go to 20v then 30v directly into your device.
I have had mine for 3+ years, have used it all across the scale. A lot of Li-on charging. 4.2v to 29.8v. I have a lot of hours on it, and it keeps on doing me good l.o.l.. I was sceptical because of the price, but recommend this to any serious hobbyist or school lab. You get used to pushing the buttons really fast. Hope this helps someone.
This supply needs a snubber resistor added at the input X cap to be safe. Hope you will be able to modify it.
The New multimeters have built in NCV non contact voltage, VFC variable frequency interface, VFD filter for motor signal. I'm not sure if the NCV can measure DC voltage on wires that are hidden in pipes or wooden walls or its just only for AC voltages. The VFC i don't understand what it is but I'm guessing when you switch the AC line frequency the VFC circuit can measure the AC voltage. The VFD filter is for motor signals which I don't understand also what a VFD filter would do used for what motor signals. Do you know what VFC and VFD is and used for?
NCV is only for AC. A VFD rapidly switches the voltage on and off usually at many times the fundamental frequency. The switching occurs in a special way that when averaged the output is a sine wave. Look into how a VFD works. The VFD function of the meter is a low pass filter that can reject the switching and allow the measuring of the fundamental frequency.
When you turn it off, or if the main power shuts down for a couple minutes, it will remember the Voltage and Current you set up? Or at least the voltage will go to zero?
It remembers both the voltage and current.
SOFTWARE FOR THIS POWER SUPPLY PLEASE
Is you have wires running through metal pipes how can you measure to check if you have DC voltages if the NCV only measures AC voltages in wooden walls and wires in metal pipes? Yes i will look into how VFD works but I'm confused why the DVM meter needs a VFD filter when the averaged output is a sinewave. I'm guessing with noise and interference's on the motor signals averaged sinewave output.
NCV is a tool for house wiring that allows you to know if it is safe to cut a hole in a wall or drill a hole. If you hit one of those lines it may kill you. Unless it is special in some way, there are no DC setups besides low voltage DC. Damaging low voltage DC lines is annoying but not dangerous. It's not the noise but the frequency. There are two frequencies on top of each other. The fundamental sine wave and the switching frequency. The meter has no good way of knowing which one you are trying to measure. The VFD feature cuts off the high switching frequency allowing the meter to "lock on" to the fundamental sine.
@@eapbg, Why does a VFD circuit output the fundamental frequency plus the high switching frequency? A VFD circuit converts AC to DC and converts DC back to AC, but the AC output has the fundamental frequency plus the high switching frequency? I'm surprised the AC motor doesn't get confused which speed frequency to use
@@billwilliams6338 A VFD turns DC back into AC by modulating the switching in such a way that when averaged the result is roughly a sine wave. I'm stating this very generally and I would suggest reading up on VFD theory. A motor has an inductance that acts as a low pass filter. The switching frequency of the VFD is usually at least 10 times if not 100 times greater than the fundamental frequency they are trying to achieve. The low pass filter type effect averages the switching frequency only leaving the fundamental frequency.
Very nice. Is it accurate at 10mA steps too?
Sub 1A it is on the nose to 1mA. Above 1A it starts to slip. When showing 5A the meter reads 4.996A.
hey bro do you still have this power supply? it is still woriking? any other review after this long time? thanks nice video ....
Yup still have it and it works great. Nothing new to report.
good job
Thanks
TekPower TP3005T
Funny how you equate smart thinking with expensive power supplies. Smart thing shouldn't come at greater cost if you want to sell a nice product. I'm talking about the logic used in the micro controller.
👍👍👍
"decently accurate" LOL is superbly accurate
Funny you should say that. Recently I've been using this supply with a Keysight 34465A 6.5 digit DMM. At 30V it is only 20mV off. Below 10V it is only 5mV off.