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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.equipment,sci.electronics.repair
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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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