Wow, I learned something. We use these in our pool business to check for voltage all the time, had no idea water could block a signal so effectively. Big thumbs up.
AC is generated as a single frequency on the power plants. True RMS are able to pick up those higher frequency harmonis which are part of any non sinusoidal waveforms found on electro/electronic machines and devices.
My (very cheap) multimeter isn't doing exactly the same as yours- it is steadily increasing from the time I turn it on until I turn it off- starting at 0.1 volts and increasing up to several volts. I think the highest it went was about 4.5 volts- no millivolts- before I turned it off, but it was still climbing. No idea why it's doing this. And this is just minutes after it was giving me accurate readings. When it's glitching out like this, it doesn't register any real readings, i.e. I connect the leads to a battery that should be 12 volts, but the reading stays roughly where it is, still just climbing 0.1 volts at a time.
Good basic video. A lot of people have not taken calculus and do not understand the conversion of an AC sinewave voltage to an equivalent DC value. The average of a sinewave is zero (has an equal amount of area above and below the abscissa (x-axis) ). However it is still doing work, so the mathematical conversion using the definition of RMS equates it to an equivalent DC value. The average of a sinewave is 0.637 times the peak (taken over only half a cycle). Again, if you took it over a whole cycle it would be zero. The RMS of a sinewave is 0.707 times the peak. These are 2 different results based on mathematical manipulation. The RMS value is used for true power. I would also like to mention that a TRUE ROOT MEAN SQUARE meter should be TRMS AC+DC to include any DC offset for a total value of voltage or current.
Excellent info. If the VFDs and inverters are installed wrong or are going bad, the dirty power harmonics can cause all kinds of problems on the line. 😎 Nice scope. ✨
Great video. With all the VFDs and inverters, a high frequency clamp meter is the way to go. Bluetooth is also a great feature for remote monitoring. 😎 Thank you. Nice video.
Bold a skid, I'll be in verter's and mark. Need to know if they're pure sign wave modified sideways or square sideways made up a civil scope today. To do that.
Ive come to this video when trying to find out why my multimeter is showing a dc voltage, which gradually grows. and its not mV. It ranges between 1 and 4v
a true RMS meter is essential for old house remodeling. i have had calls before someone says my meter shows 120 volts but my light is not burning. but my RMS meter shows 70 volts which is most commonly a broken neutral.
Can you tell me. I have 1 set of outlets where the ELL is showing a constant 20AMP is shows this when nothing is running and when things are running. The breaker is only 15AMP. I tested this outlet because often times the breaker will trip when we turn something on.
Good answers to important questions.. dealing with multimeters are not like learning to use a calculator.. which I've had to warn a few ppl to really ask questions read about & really know exactly how to properly test various ac & dc currents the proper way so no damage is caused.
