I have a bunch of adjustable DC power supplies which I need to adjust to 5 VDC output, but I suspect that when I just test it with multimeter it won't show correct voltage. Would would be a simple way to test it under load? Put some kind of resistor between power supply output and multimeter?
Put some kind of resistor between power supply output and multimeter?
QuotePut some kind of resistor between power supply output and multimeter?That sounds like you're thinking in series?- I think parallel is the correct way, ie the load is across the power supply and you in turn measure the voltage across the connections. I'm no expert, but that makes more sense to me....
Yes one measures voltage in parallel with the power supply output terminals and one measures current in series with the load.
QuoteYes one measures voltage in parallel with the power supply output terminals and one measures current in series with the load.I'm bored so I drew a pic of that
If it's regulated supply (aka. switching) then it shouldn't make any difference.PS: You could always try one and see ... that's how we learn!
That's common with switching supplies. They often have good regulation under various loads, but under no-load conditions, they'll be a bit unpredictable. The output filter (converts pulses into smooth DC voltage) needs a resistive element to complete the filter. It shouldn't take much to start coming together.
Thanks! I measured it under load (actually wired to finished project), and it's strange but I'm not getting above 4.5V output when I'm using 5V input supply. No matter how far I adjusted it. Is it expected? It's rated for 4-35V, but maybe I'm hoping for too much here It has no problem giving 5V out with 6VDC and higher supply...
For some reason I thought it was a booster, I guess not..
I'm not getting above 4.5V output when I'm using 5V input supply
For some reason I thought it was a booster, I guess not..Here it is:http://www.ebay.com/itm/1pcs-DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1-23V-30V-/370772814758I use it to power my custom ATMega644P board that also has RTC, WaveShield and 32x16 LED matrix display...
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