@PaulAlfaro: The meter is really nice and a great value. It’s a quite accurate AC coupled RMS voltmeter/multimeter with Bluetooth that allows readings to be displayed on either Android devices or PCs with the optional Bluetooth-USB adapter shown below. It’s supposed to work with IOS too. The yellow buttons can also be exercised via Bluetooth.
In “Offline” mode it can be configured to store 10,000 readings at sample rates up to 1/second. It turns off Bluetooth to do that, but the meter’s display keeps updating. When it finishes recording the meter beeps 3 times then apparently turns itself off (smart!).
The “Offline” data can be downloaded into either an Android device (I used a Samsung J7) or PC (I used a Surface Pro 3) equipped with the above adapter (which finds other Bluetooth devices too, so you need to select the right one.) I also needed to run the PC meter software as an Administrator to get the data stored on the PC. Each line of the stored .csv file (which gets automatically overwritten) contains the number, date, time, measurement mode, measurement unit, and measured value for each sample. That makes analysis easy with Excel.
Since motors used with VFD’s apparently generally do a good job of filtering out the PWM base frequencies. The active AC/DC current probe shown in my previous post is likely overkill for most. This passive current probe and associated connectors shown below should be adequate with HF spindles up to 1000 Hz.
@Julien, @AlexN, @JappieMike, and other with HF Spindles might be interested in this too, Thanks for expressing yours!
