Troubleshooting Switching Power Converters: A Hands-on Guide

Chapter 9: Effective Bench Work

Introduction

As I said, I first need to emphasize underlying principles rather strongly. Now, with that behind us, we are in a much better position to understand this particular chapter.

Basic Equipment

This book is not a substitute for an equipment manual! You must familiarize yourself well with the details of your specific instruments.

The most important piece of equipment on your bench is the oscilloscope. In Chapter 7, I mentioned an incident plucked straight from the annals of that timeless battle between analog scopes and digital scopes. It should help us all realize that though analog scopes may not be able to see something that is non-repetitive or too brief, digitals can very easily miss something that does exist. Yes, in digital scopes you can also end up seeing something that doesn't exist they call it aliasing. I just say, " check you are really on s/div, not ms/div!" For this reason I tend to agree when they say, "analogs don't lie." Yes, they may not tell you everything on occasion, but at least you usually know beforehand what that missing information is likely to be. On the other hand, digitals have been caught virtually lying through their teeth on occasion, besides simply not telling you the whole story. And worse, with digitals you may never know what you have missed, until of course those old-fashioned guys sitting around their analog scopes on Ubi Avenue (in Singapore), tell you what to start looking...

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