Signal tracing your amp with a multimeter.

[pompeiisneaks]

Figured you guys might know this, but it can't hurt to share :) 

[sluckey]

In reference to the different voltage readings at the beginning of your video...
Why does the fluke show 150mV and the scope shows 400mV?

It's because the fluke is showing RMS voltage and the scope is showing peak to peak voltage. You need to know the difference and how to convert.

     V_pk = 1.414 x V_RMS

     V_pk-to-pk = 2 x 1.414 x V_RMS

     In your case, V_pk-to-pk = 2 x 1.414 x 150mV_RMS = 424mV_pk-to-pk

Maybe your scope is capable of displaying AC sine wave voltage amplitude in RMS value also???

[pompeiisneaks]

In reference to the different voltage readings at the beginning of your video...
Why does the fluke show 150mV and the scope shows 400mV?

It's because the fluke is showing RMS voltage and the scope is showing peak to peak voltage. You need to know the difference and how to convert.

     V_pk = 1.414 x V_RMS

     V_pk-to-pk = 2 x 1.414 x V_RMS

     In your case, V_pk-to-pk = 2 x 1.414 x 150mV_RMS = 424mV_pk-to-pk

Maybe your scope is capable of displaying AC sine wave voltage amplitude in RMS value also???

It probably is, I was just looking at the vernier divisions set at 50mV per division and could count 4 boxes so I knew it was 400mV peak to peak.  There are like multiple different measurements I can select, I may have to take a look at that,

Thanks!

~Phil