Prior to making "power-on" measurements on a...

Question 1 / 27070SH0dDk01Xd3BUxp5HzTj

Question 1 of 27070SH0dDk01Xd3BUxp5HzTj

Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following:

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Question 1 of 27070

Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following:

🔍 Key Concepts

• Grounded vs. ungrounded test equipment when working on power supplies • The role of a line isolation transformer in protecting equipment and the technician • What kinds of test setups can damage a non‑isolated switching power supply

💭 Think About

• Ask yourself what could happen if the negative lead of your scope or meter is tied to ground and you clip it to a point that is not at ground potential in a non‑isolated supply. • Consider why isolation from the AC mains is a big concern specifically for switching power supplies compared to simple linear supplies. • Think about which choice describes a real electrical hazard or risk of destroying components, versus answers that are about convenience or are clearly false.

✅ Before You Answer

• Identify which choice mentions line isolation transformer and grounded test equipment and think carefully about that situation. • Eliminate any option that claims something is "not possible" if you know in practice it can happen under some conditions. • Ask which option deals with safety and preventing damage rather than just ease of measurement or routine steps.

Question 1 of 27070

Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following:

You need to know where the filter capacitors are so they can be discharged.

If it does not use a line isolation transformer you may destroy the supply with grounded test equipment.

It is not possible to cause a component failure by using ungrounded test equipment.

So that measurements can be made without referring to the schematic.

Question 1 / 27070SH0dDk01Xd3BUxp5HzTj

Question 1 of 27070SH0dDk01Xd3BUxp5HzTj

Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following:

Back

Question 1 of 27070

Prior to making "power-on" measurements on a switching power supply, you should be familiar with the supply because of the following: