121GW Multimeter - Bluetooth Logging Sample rate

[Ted123]

 Hi all

I've just recently got the 121 GW multimeter, pretty happy so far.

I did a uA test  for the flame rectification check on a flame rod on gas heater, seemed to work well and was getting around 3 uA which sounds about right.
 
I tried to do a cranking test on my car battery with the Bluetooth logging to see what the minimum cranking voltage it got. It seems to be around 10.3 volts as per the photos. 12.6 standing voltage, 10.3 cranking, 14.1 charging as per the photo. What is the sampling rate of the Bluetooth logging (how often does it take a reading) I had it on the ln0 setting  and would this be a reliable test ?

I have to say the set up and connecting of the app and Bluetooth for a novice and non EE like me.

I tried to do the min and max reading but it kept saying 0 volt so I must have been doing wrong

[J-R]

A typical DMM and this logging method in particular are going to be a bit slow for capturing a lot of detail.  I'm not sure what you're trying to see, but you could pull your fuel pump fuse or otherwise prevent the car from starting to extend the cranking time.

Another method: if you have an oscilloscope or DMM with a scope function, you could gather multiple seconds on the screen at great detail.  For better accuracy, a bench DMM with a fast logging rate could also do this.

[BILLPOD]

Good Morning Ted123, Page 58 of the Users Manual explains how to use the Min/Max function.   Also, logging voltage using the internal Micro SD card can allow you
 to take samples many times per second, or 1 per second by default.  Page 54 of the manual will explain how to log data by just pushing the 'Mem' button.   So, if you RTFM, all your questions will be answered.  And welcome to the 121GW Club