Hello, great question! The answer is both yes and no: No: 1. If you’re using an analog multimeter or a digital multimeter you’re unfamiliar with. Analog meters typically have lower impedance, which can affect the circuit you’re testing, potentially leading to unsafe conditions or meter damage. 2. If you’re unsure what you’re probing. Safety is your top priority, and if you’re not confident about the circuit or your tools, it’s better to avoid the risk. Yes: 1. If you understand how digital multimeters work. Digital multimeters, especially high-quality ones like the Fluke 177, have high input impedance. This means they draw very little current from the circuit, reducing the risk of interfering with live measurements and helping protect both the user and the meter itself. 2. If you know the circuit you’re working with. Always perform a “hot probe test” first (voltage measurement) to ensure the circuit is de-energized. Once you’ve confirmed it’s safe, you can switch to a “cold probe test” (resistance measurement). 3. There are times such as this that it’s better to probe the instrumentation while the system is in operation (energized) to get the real-time data. In this case, if you have low resistance reading (of pressure switch), making it parallel with your high impedance ohmmeter, you can be confident it can withstand the live potential of the circuit within 1 minute or less (time limit) exposure. Even though some high-quality digital multimeters, like the Fluke 177, can withstand certain live conditions for short periods, it’s always a best practice to de-energize the circuit before switching to resistance mode. This minimizes any risk of hazards or damage to your equipment.
Your videos are very helpful. Please keep making such learning/tutorials as you explain it very well. You will be a very successful person, wish i had knowledge like you.😂😅 Please keep making , dont stop❤
Salamat lecky. Can you explain or do a video gow to check and verify the good working of flame sensor and flame relay of a boiler? Would be a great help. 😊
is it safe practice to switch from voltage measurement to resistance while the circuit is live? 13:40
Hello, great question! The answer is both yes and no:
No:
1. If you’re using an analog multimeter or a digital multimeter you’re unfamiliar with. Analog meters typically have lower impedance, which can affect the circuit you’re testing, potentially leading to unsafe conditions or meter damage.
2. If you’re unsure what you’re probing. Safety is your top priority, and if you’re not confident about the circuit or your tools, it’s better to avoid the risk.
Yes:
1. If you understand how digital multimeters work. Digital multimeters, especially high-quality ones like the Fluke 177, have high input impedance. This means they draw very little current from the circuit, reducing the risk of interfering with live measurements and helping protect both the user and the meter itself.
2. If you know the circuit you’re working with. Always perform a “hot probe test” first (voltage measurement) to ensure the circuit is de-energized. Once you’ve confirmed it’s safe, you can switch to a “cold probe test” (resistance measurement).
3. There are times such as this that it’s better to probe the instrumentation while the system is in operation (energized) to get the real-time data. In this case, if you have low resistance reading (of pressure switch), making it parallel with your high impedance ohmmeter, you can be confident it can withstand the live potential of the circuit within 1 minute or less (time limit) exposure.
Even though some high-quality digital multimeters, like the Fluke 177, can withstand certain live conditions for short periods, it’s always a best practice to de-energize the circuit before switching to resistance mode. This minimizes any risk of hazards or damage to your equipment.
Good content. You earned another subscriber.
kaya idol na idol kita sir elect
Thank you Sir Lecky, sa shoutout!!! 🙏🏻⚡🫡 More Subscribers to come.. Godbless Sir
🙌
Your videos are very helpful. Please keep making such learning/tutorials as you explain it very well.
You will be a very successful person, wish i had knowledge like you.😂😅
Please keep making , dont stop❤
Thanks, appreciate you. More in the pipeline. Keep on probing😀
Salamat lecky. Can you explain or do a video gow to check and verify the good working of flame sensor and flame relay of a boiler? Would be a great help. 😊
Hello, looking forward to that. Keep on probing😀
Yeah great videos, make schematic/ diagnoses videos +1 sub