OWON P4305 Lab Power Supply Review (1): First Tests, Failure & Teardown

The unit gave up on me after the first tests, so I had to improvise …
↓↓↓ Complete description, time index and links below ↓↓↓

The video starts out as planned with me showing you what’s in the box, the unit itself (dimensions, weight, etc.), its display (viewing angle) and its basic operation. Then I carried out some ripple and noise as well as transient measurements.

After that the unit’s display failed. So I filmed my two repair attempts – one failed and one aborted. And since I had the unit already open I went over its innards teardown style. You’ll probably notice that I was kinda frustrated at that point.

►Intro
00:00 Intro – best plans laid 
►Basics
00:48 What’s in the box – no surprises
01:31 The unit – from all sites, size and dimension
03:05 Display – viewing angle
03:20 Basic operation – display and controls
►Ripple and Noise
05:53 Ripple and noise – measurement setup
09:02 Ripple and noise - too low to measure (for me)
►Bad Omens
11:34 Display trouble – but it goes away again
►Transients
12:17 Switch on (constant voltage) – between perfect and borderline
16:23 Switch off – just for funsies
16:37 Switch on (constant current) – catastrophic overshoots
19:09 Over current protection – works perfectly
19:57 Over voltage protection – works perfectly too
►Display Failure
20:44 Display failure – LCD stays dark
21:45 1st repair attempt – unsuccessful
24:25 2nd repair attempt – aborted
►Teardown
25:21 Teardown – detailed looks on the inside
31:10 Criticism – it’s so noisy because it’s so small
►Wrap-Up
32:21 Wrap-up – things went not as planned and bye

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