If you mean electrical noise, there's some fast switching noise on the output as you might expect from a switching power supply, the amplitude stays the same but the frequency goes up with output voltage. It'll show up on a 'scope if there's no load, probably as a sequence of quick impulses with a decaying "ring", it's nowhere near as bad as a typical cheap switched PSU and any kind of load capacitance should mop it up. If you mean audible noise, it has a fan but that only comes on when it's hot. Without the fan running it's effectively silent, though some switching PSUs can emit a whistle at the switching frequency, if you get one with something physically able to vibrate inside and your ears are up to hearing that. My ears aren't bad and I've heard nothing from my one.

With ‎wps1203h style ‎120v/3a(360w) what is maximum current at 12v / 24v?

At both voltages, the max current is 10 amps.

How do I set constant current for it? It keeps reverting to 0 when i press output

Replicated your problem on my unit - once you have set your required voltage output and the maximum current limit setting for the item under test or being run you then push 'Output' .... BUT, if there is no active load attached to the power supply it will show the row of 'zero's' on the current readout after a couple of seconds or so.

When using the usb output is the current and voltage displayed so that you can use it as a usb power meter?

NO THERE IS NO VISUAL INDICATION THAT THE USB CIRCUIT IS ON OTHER THAN THE APPLIANCE ON CHARGE THE FRONT PANEL SHOWS ONLY POWER OUTPUT NOT USB.

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⚡ Power precision meets sleek portability — own the bench, own the future.

COMPACT POWERHOUSE - Lightweight 2.47 lbs and portable size fits perfectly on any modern workspace.
ROBUST SAFETY SUITE - Built-in OVP, OCP, SCP, and thermal controls keep your gear and experiments safe and sound.
SMART USB FAST CHARGING - 18W USB port auto-adapts to your device’s fast charging protocol—declutter your bench.
PINPOINT PRECISION CONTROL - Adjust voltage in 0.01V and current in 0.001A increments for lab-grade accuracy.
SEAMLESS CC CV AUTO SWITCHING - Automatically toggles between constant current and voltage modes to protect your projects.

This NANKADF WPS305H DC power supply delivers up to 30V and 5A with ultra-fine 4-digit LED precision. Its compact 7.48x3.54x5.9 inch frame and 2.47-pound weight make it ideal for professionals needing portable, reliable lab power. Featuring an 18W USB fast charging port, encoder knob digital adjustment, and advanced protections like OVP, OCP, SCP, it ensures safe, efficient, and versatile power delivery for all your testing and development needs.

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Manufacturer	NANKADF
Part number	WPS-10H
Item Weight	1.46 kg
Product Dimensions	19 x 8.99 x 14.99 cm; 1.46 kg
Item model number	WPS305H
Size	7.483.545.9
Colour	Black
Style	30V/5A(150W)
Material	PE_(Polyethylene), PLA_(Polylactic_Acid), PS_(Polystyrene)
Wattage	150 watts
Maximum power	1.5E+2 Watts
Item Package Quantity	1
Specification met	UL
Batteries included?	No
Batteries Required?	No

DC power supply (0-30V,0-5A) adjustable, switching power supplies, mini high precision 4-digit display with USB fast charging interface, variable lab bench power supply, output on/off/encoder knob

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