Sears Multimeter #82139 for Duty Cycle Check - PeachParts Mercedes-Benz Forum

Mark M · #6 08-11-2006, 10:41 AM

Quote:

Originally Posted by Arthur Dalton

The manual for that meter states the duty cycle measure is for ON pulse width, from 100us-100ms [ which is 0.1%-99.9 %]
My info shows Benz uses Off cycle for duty percentage. [ meaning a correct reading with that meter requires reverse polarity of leads]

Arthur,
I could not find anywhere in the manual where it states that the meter uses the ON pulse width. I called EXTECH (mfg for this Sears multimeter) and tech support confirmed that they have no documentation stating such. I relayed my story of checking the meter against the Indy MB mechanic's duty meter and he concluded that the meter appears to be displaying ON vs OFF as a %.

Based on this info, I would suspect that we have a few members of this forum that are running lean at 65% instead of the 45% they think they have their car set at.

Interesting...