BEST QUALITY DC Bench Power Supply Dr.meter 30V/5A DC Bench Power Supply PS305DM - DETAILED REVIEW

[Music] hello again this is Robert Veatch here this is my video review of a power supply called doctor meter this is a DC power supply PS - 3 0 5 DM comes with instruction manual it's not too clearly written so we're going to go over some of the features of this and independently of the manual very nice you have a voltage adjustment fine in course and it goes from 0 to 30 volts and you have a fine and coarse adjustment for current from 0 to 5 amps so that means it'll produce 30 volts at 5 m/s maximum now the power switch is right here turned it on you hear really and first thing you notice you hear a fan so I'm gonna show you the back of it has a continuous fan going to keep things running cool I think this is a linear power supply I'm going to open it up we're gonna look at the inside of it now it has a ground tab right here and that is the ground that is connected to earth ground on your 120 volt outlets you have the minus and the plus it comes with these basic alligator clips with the banana plugs on there now you can see I could have to turn the course and I could change the voltage here drop it down or increase it so when you put the fine all the way to the right of course showing 31.9 now I'm gonna also show you how to do constant current on this which is a really nice feature now before we go into the details I'm going to turn this off I'm going to show you the back of the supply there's a little bit confusion about the position of the power switch on there now if you look here I'm going to go a little closer there's that fan I mentioned by the way so this AC cord is included it says 100 10 20 20 volts so that's just telling you that's the range don't look at that as a positional information because then it would be confusing so when you click this switch to the right you see a hundred and ten volts displayed so four hundred ten volts you want to click it to the right and people are getting confused because they see the 220 there so clicking it to the right you see 110 volts written right there if you were to click this to the left it will show 220 volts in the writing right there so just kind of ignore that so for everybody in us just click that switch to the right and you'll be ok too though say 110 volts right there so the unit is quite heavy it's twelve and a half pounds of weight so what's up there look which is what I'm thinking it's a linear supply now I have some multimeters over here so the first thing I want to do is I'm going to just put them on voltage now let's take a look at the voltage here so this multimeter is showing it 19 volts 1905 has an increase it 31.9 so you can see it's tracking it quite nicely so if it was not tracking you can adjust the output voltage right there to match what you're measuring right there but I'm not going to do that because it doesn't look like it's necessary I want to mention this stop out button right here what that does is that disconnects the output from the test clips so you see how it went to zero that way you could have on your circuit and then you could essentially put the voltage there once you've got the voltage all stabilized that's nice so to do a constant current set up I turn the power supply on but first I shorted the leads right here so I'm going to slowly bring the voltage up and right now it's in milli out so you can see is 318 milliamps because it obviously can't be amps and you see the constant current light comes on now I can adjust this to what I want let's say I want to make it 1 amp so that it's never going to go above 1 amp now if I undo this short now you see I've got full holes of control right there but if I were to overload it you can see it instantly went to 1 amp current and then way you could protect your device if it has a 1 amp upper limit and that's what they're talking about the constant current now I have the meter connected with no load going to my Tektronix scope right here and we're going to just look at the ripple we can see it so I have the gain increase on the oscilloscope to 500 millivolts per division and if you look I'm gonna try and trigger that signal right there and it looks like the peak to peak there's just a little bit of noise right there the peak to peak is less than 500 millivolts which is really good now we're going to put it under load and we're going to see how much that increases I'm going to put it using that same resistor that I show down there and when I connect a resistor right now and I see under load it jumped up to five amps and what you notice is is producing six point nine seven volts at five amps it's fully loaded the current at that voltage and you can see the ripple is still less than five hundred millivolts so that's really good that means this thing under the full load it's less than five and a millivolt ripple that's what you want so that shows that it's a very clean power supply now we're going to show the regulation we're going to put this load resistor on an office supply and we're going to see when the current jumps up what happens to the voltage so there's two point six six amps seventeen point one volts let's remove the load and let's increase that now we're at the highest level thirty one point eight and it's producing five amps and it's still thirty one point eight so you can see as I put the load on there there's even a little little spark going on right here's a lot of current the power supply is not budging it's regulating perfectly and again if you want to hit the stop out button what's nice about that is it'll disconnect that power to that power resistor and then when you're ready again it'll connect it back and produce that five amps to it so you see it's got really nice regulation and it is producing the five amps through a very low ohms and which is this point getting pretty hot so the the power supply is working it's regulating and it's running cool it's not shutting down so that's really nice so I took the cover off of the dr. meter DC power supply the PS dash 3:05 diem and as I suspected is analog supply you could see this very huge AC reduction transformer very nicely built you can see the electronics you can see this large heatsink there is the fan mid change angle here so you can see that very large heatsink right there that's dissipating the output to power transistors right there and the letter e large transformer and the main circuit board and you can see all the control knobs and all the wiring right there so this is very nicely constructed I could see the wiring job right there looks really nice very clean and very solid which is what you want for a power supply so I really like this power supply the profile is nice and small it seems very well built and as you saw we opened it up and it was a linear power supply with a nice big hefty transformer with nice electronics inside there somebody give us the full 5 star rating and on my channel please remember hit the subscribe button and the bell icons are you're learning to new video uploads if you like this video please hit the like button also I hope this video review helped you with your buying decisions thanks for watching [Music]

Channel: Robert Veach

Views: 51,338

Keywords: review, Dr.meter, Dr.meter 30V/5A DC Bench Power Supply, Single-Output, PS305DM, robert veach, jeffgrave, Vparanormal1, Vparanormal, jefferson graveyard show, Constant voltage and current operation, Current limitation protection, Output constant current adjustable, continuously adjustable linear DC voltage regulator power supply, 3 digit LED voltage and current display, universal power supply, bench power supply, Thousandshores Inc

Id: IEf28jZK6QE

Length: 9min 28sec (568 seconds)

Published: Mon Dec 24 2018