Fluke DMMs and VFD motor drives
DaveC wrote:
I'm considering the purchase of a new Fluke DMM. I like the low-impedance
feature of the 117, but the low-pass filter feature of the 87 is also
attractive.
I had a conversation with a support engineer at Fluke today to try to help me
decide between these two meters.
It came down to the question of whether the variable-frequency drives I come
across will have noisy outputs which the low-pass filter will be helpful in
dealing with.
Among other services, I install some (3-phase, mostly) VFDs for 230v motors
on old printing equipment to give them a 2nd life.
I have no idea how many (ie, percentage) of VFDs are "noisy" that will make
measurement difficult with a DMM w/o low-pass filtering. Is this a common
problem?
If you've got some experience in this area I'd like to hear your comments.
Thanks,
Dave
A scope meter is the best tool for such a job..
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