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 Reviews    • Reviews   OWON P4305 Lab Power Supply (30V/5A) Unboxing and First Impressions    • OWON P4305 Lab Power Supply (30V/5A) Unbox...   TESTEC TT-MF 312 Probe and HZ22 BNC Feed-Through Terminator Unboxing    • TESTEC TT-MF 312 Probe and HZ22 BNC Feed-T...   Fake Chinese MAX31855K Boards, Modules and Chips!    • Faulty Chinese MAX31855K Modules: Fake Chi...   Small Project: Constant Resistance 24V/100W AC/DC Electronic (*) Load – Part 1    • Small Project: Constant Resistance 24V/100...   EEVblog #594 - How To Measure Power Supply Ripple & Noise    • EEVblog #594 - How To Measure Power Supply...   #powersupply #teardown #test #review #reviews #tests #repairs #robertssmorgasbord