Fluke PM97 scopemeter power measurements

[Chaoswarper86]

Hello everyone!

I'm new on the EEVblog forum! Greetings to Dave!

I'm from Finland so my English is not perfect 

Few days ago I recieved my first scopemeter ( FLUKE ofcource  )  from German ebay seller. I've notised that this scopemeter can measure power consumption with voltage and current with Fluke i1010 current clamp. I work as an electrician in big sawmill, and many motors there are runned via inverter. Sometimes one motor take overcurrent without reason and inverter goes down. Motor seems to be alright, phase resistance is similar and there is no earth leakage on windings. I wonder can the switching frequency 10 KHz of the inverter confuce the scopemeter if I measure motor power consumption after inverter? Motors are 3 phase ( 400 V ) ofcourse so I can only measure power at single phase at the time but It should be identical at all phases. Does anyone have experience about these measurements?

[Zermalmer]

Hi,
I'm not familiar with engine mesurment with scope meters...
I take a look to the manual of the PM97 (http://assets.fluke.com/manuals/93_95_97umeng0000.pdf)... on Chapter 5-10 the manual describes how to measure a 3-phase Y connection... maybe this can help you.

but It should be identical at all phases

You are experienced... so expect the unexpected... only if you really measure on all 3 phases the same, THAN you can say that they are identical....

I hope some more experienced users can halp you more...

best regards