Well I must say that I am quite impressed with this PokitMeter. I am a turbine test engineer and use vibration analyzers on a daily basis where connections to low voltage/current proximity probes, velocity transducers, and accelerometers (not to mention a couple other weird sensors) are made.
I am using this on an iPhone XS Max. Connectivity was perfect. No fuse issues for me. Battery was covered with a film that needed to be removed but other than that everything was easy to set up.
Connecting to the device works easily and quickly every time. (I pull the battery when not in use).
Voltage measurements are accurate on 1.5 V batteries. Resistance measurements worked on some resistors I tested at work. I have not verified accuracy against a fluke but that is an easy enough test for another day.
What really blows me away is the oscilloscope feature!
Based upon the oscilloscope: it took a few minutes and tries to get all of the settings sorted but I was able to generate the same spectrum plots compared to my OROS analyzer (peaks at the same frequencies on a turbine engine). the amplitudes are close but it is hard to tell what the oscilloscope outputs are in on the Pokit (peak-to-peak or RMS????) all I get is a voltage value and not what the value represents.
I really like the ability to drag around the cursor to see what requency is for my peak. It even states the frequency in a nice callout. Just add the Y value to that callout and it would be perfect! (i.e. do something like (x-value and unit , y-value and unit) for the callout on the graph). I also like the ability to drag two different callouts around and see the delta. Same request for the Y values to be included in the delta.
The x-axis on the frequency spectrum analyzer has issues. It appears to show half on some of the selections (see image provided above). Not a huge deal just have to thumb around selecting one at random until I get the graph to show what I want but it is more of a guessing game at that point. (bug fix please haha!)
The history feature is awesome, probably one of the coolest WOW moments for me when I saw how many FFT’s it had stored in the app (20+ results on the recent section). I could not for the life of me figure out how to save the recent measurements though……..until I swiped left! The options came up to Delete/Export to CSV/Save. Saving is cool because it renames the measurement on both the recent and saved list.
Exporting to CSV is an amazing feature. Here is the charted data from excel that I plotted. It looks like the time domain sine-wave of my signal. I think as a feature request it would be great to also have the frequency domain export as an option so I can plot the spectrum output data in another program.
I want to thank the Makers from PokitMeter for all of their hard work in a relatively short amount of time to bring us an amazingly affordable and revolutionary tool. Keep up the great work and please take a looks at these feature requests for ideas to make the app even better:
Allow choice between RMS and Peak-To-Peak for spectrum plots on the oscilloscope.
Display amplitude values on the crosshair callout in addition to the frequency/time
BUG: fix window sizing discrepancy between X-axis frequency domain and selection chosen.
Allow CSV export of spectrum plot (frequency domain data)
Have a button that allows to switch between taking a sample and viewing actual live data on the spectrum/oscilloscope (this is a big sweet feature).
Scroll through top 10 highest peaks with the callout in Oscilloscop/Spectrum mode
Ability to zoom out a little more on the graph. My iPhoneXS Max gets some of the data cut off due to the darn left edge of the phone screen making a U-shape where the camera/speaker is.
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