This is an excellent teaching video. I am in the Hvac field and I have worked with people that have told me that true RMS is not important. I never knew how important it really is for trouble shooting. I was watching videos because I am about to invest in a new amp meter. This definitely helped my decision. To all the workers out there we must know our trade.
Q: WHEN is a NON-TRUE RMS VOLT meter, a better choice than a TRUE RMS meter?? A: Automotive alternator D.C. VOLTAGE OUTPUT measuring. Why? Alternator output should have only D.C., without any A.C. waveform, (called DIRTY D.C.), riding on top of the D.C. If an alternator diode set is bad, the dirty D.C. will NOT ALLOW a NON-TRUE-RMS voltmeter to SETTLE DOWN. The voltage display number will be erratic. BUT, a TRUE RMS meter, set to D.C. will settle down and FOOL YOU into thinking ALL IS GOOD, when in fact, the alternator is BAD.
Today I objectively tested my Fluke 117 "true RMS" meter against an oscilloscope measurement of RMS voltage at 60 Hz, using a square wave input from a signal generator with or without offset, varying duty cycles. I would have thought that the Fluke would do pretty well. Not so, compared to the scope! When it didn't perform well at 15kHz, I assumed it was because the sample rate was too slow, but even at a slow 60 Hz it can't keep up. Presumably the refresh and higher sample rate of the scope was the difference. At 50% duty cycle it is close, but for outside limits like less than 30% duty and more than 70% the result was pathetic.
spelunkerd I’m trying to figure out how the current peak changed when he used the dimmer switch, I thought only increasing the load (reducing impedance) would result in increased current.
Great informative piece there...thanks . I would love to own one of you're multimeters one day... A very prestige & reassuring accurate device in today's world, were as the Gentleman said , how advanced & technology has evolved so fast. With electric vehicles as an example. You're all over the car with a meter, tracing issues... accurate reading,is essential. Fine Meter Indeed.
Hi Samson - Our multimeters will have a specified resistance value at which the continuity is guaranteed to beep and give an audible tone. That value can vary depending on which meter you are using. Which multimeter are you using and what resistance value are you measuring? Example would be the Fluke 179, the continuity beeper is only specified for ohm measurements at 25 ohms or less. Any measurements above 25 ohms is not guaranteed to beep.
Hello - Please review CZcams link: bit.ly/2WMz0ZB This will show how to measure current with a Scopemeter and current clamp. Which Fluke Scopemeter are you using and with what current probe?
A true RMS meter gives more accurate results by accurately examining a sine wave compared to an averaging meter, which gives a rough estimate. The average meter is alright for perfect sine waves, but when you have distorted waves, you can get incorrect readings, which could interfere with troubleshooting or diagnostics. When it comes to sensitive electronics, it's important to have accurate measurements.
Hi Scott - This would depend on the direction of the dimmer switch. If you were to dim the lights you would be increasing the resistance giving you a lower current through the bulb. And the opposite would be to brighten the bulb where you would decrease the resistance and increase the current.
This is an excellent teaching video. I am in the Hvac field and I have worked with people that have told me that true RMS is not important. I never knew how important it really is for trouble shooting. I was watching videos because I am about to invest in a new amp meter. This definitely helped my decision. To all the workers out there we must know our trade.
Wow. Outstanding Video. Simple and no bullshit introduction. Just the pure information. Thanks a lot
Thanks very much for explaining that. I now have a better understanding of True RMS.
Q: WHEN is a NON-TRUE RMS VOLT meter, a better choice than a TRUE RMS meter??
A: Automotive alternator D.C. VOLTAGE OUTPUT measuring. Why? Alternator output should have only D.C., without any A.C. waveform, (called DIRTY D.C.), riding on top of the D.C. If an alternator diode set is bad, the dirty D.C. will NOT ALLOW a NON-TRUE-RMS voltmeter to SETTLE DOWN. The voltage display number will be erratic. BUT, a TRUE RMS meter, set to D.C. will settle down and FOOL YOU into thinking ALL IS GOOD, when in fact, the alternator is BAD.
Today I objectively tested my Fluke 117 "true RMS" meter against an oscilloscope measurement of RMS voltage at 60 Hz, using a square wave input from a signal generator with or without offset, varying duty cycles. I would have thought that the Fluke would do pretty well. Not so, compared to the scope! When it didn't perform well at 15kHz, I assumed it was because the sample rate was too slow, but even at a slow 60 Hz it can't keep up. Presumably the refresh and higher sample rate of the scope was the difference. At 50% duty cycle it is close, but for outside limits like less than 30% duty and more than 70% the result was pathetic.
spelunkerd I’m trying to figure out how the current peak changed when he used the dimmer switch, I thought only increasing the load (reducing impedance) would result in increased current.
Hi Scott - I decided to answer this question on your original comment. Please feel free to send a reply to our answer if you have more questions!
Great explanation. Now it's easy to justify the investment in a True-RMS metre.
Thanks for your feedback, Lynda!
Great informative piece there...thanks .
I would love to own one of you're multimeters one day...
A very prestige & reassuring accurate device in today's world, were as the Gentleman said , how advanced & technology has evolved so fast.
With electric vehicles as an example.
You're all over the car with a meter, tracing issues... accurate reading,is essential.
Fine Meter Indeed.
I am new on electricity, and I like to have good tools, so I bought the 87V-MAX, do you guys have like a play list videos for this multimeter
We have quite a few videos that might be of interest. Check these out: bit.ly/3eBQTmq
@@fluke thank you
Enough said. Thank you!
Exelent video, tks FLUKE 🎩
شرح ممتاز بارك الله بكم
nice info..should hook it up to a scr volts/amps circuit ... thanks...:)
Perfectly explained
Thanks for watching!
Very nice! But I'm color blind? 1:44
A is red. B is blue
@@Jack_The_Biker kind of...
Question: do True RMS meter need the DVA adapter for checking pick up coils?
Hi Willy - The TRMS meter would need to have a peak function like the 87V and would not need a DVA adapter.
If my multimeter is reading continuety on the mineral resources but not beeping, what does it mean?
Hi Samson - Our multimeters will have a specified resistance value at which the continuity is guaranteed to beep and give an audible tone. That value can vary depending on which meter you are using. Which multimeter are you using and what resistance value are you measuring? Example would be the Fluke 179, the continuity beeper is only specified for ohm measurements at 25 ohms or less. Any measurements above 25 ohms is not guaranteed to beep.
Thanks sir...so true rms is for AC readings only..
Hi Abhay - A true-RMS device (RMS = root mean square) is one of three tools that can measure alternating current (ac) or ac voltage:
bit.ly/38hpMYj
@@fluke You didn't answer the question.
@@immeohmyoh the answer is yes and to be fair that link really gives more than enough info to fully answer.
@@isaacturner199 The answer is NO. A DC PWM signal from a microcontroller would also be wrong.
my fluke 179 is true RMS is I have a square wave with 7℅ of duty cycle what equation can I use? Thanks for that video!
how u make scope show real current,,,, pls show us setup connections
Hello - Please review CZcams link: bit.ly/2WMz0ZB This will show how to measure current with a Scopemeter and current clamp. Which Fluke Scopemeter are you using and with what current probe?
okay so how do i apply this? or in other words what does this tell me?
A true RMS meter gives more accurate results by accurately examining a sine wave compared to an averaging meter, which gives a rough estimate. The average meter is alright for perfect sine waves, but when you have distorted waves, you can get incorrect readings, which could interfere with troubleshooting or diagnostics. When it comes to sensitive electronics, it's important to have accurate measurements.
Applying this to music
How does a dimmer switch increase the peak to peak current? Makes no sense
Hi Scott - This would depend on the direction of the dimmer switch. If you were to dim the lights you would be increasing the resistance giving you a lower current through the bulb. And the opposite would be to brighten the bulb where you would decrease the resistance and increase the current.
Very good sir
🙏🙏🙏🙏🙏🙏🙏
Ok. So then I wonder why ALL Fluke meters wouldn’t be mandatory true RMS?
Ask them what RMS IS.
If “True RMS” is so important, WHY do you guys sell meters without it in 2023+ ??
I use fluke because it says I’m a professional and not playing games
O