Electronics > Repair
Fluke 741B & BE9005 Battery Eliminator
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Alvin Purple:
Hi,

Does anyone know the polarity of the Fluke 741B or BE9005 Battery Eliminator - power connector?  I think I've killed a Fluke 741B Documenting Process Calibrator by trying to power it with a generic 7.5 DC power supply with the polarity reversed.  As you may know most electronics equipment with a barrel type power connector has polarity of inner +ve and outer -ve.  I have a (sinking) feeling the Fluke 741B  external power (BE9005 Battery Eliminator) is -ve inner and +ve outer on the power connector.  Please confirm.  If I'm correct then can I repair this 741B?

Thanks!
Tj138waterboy:
I stumbled across 1 photo of the wall wart that showed center positive marking on the plastic. It seems that that info has been blurred out or erased from most photos I came across.
dew:
Port for BE9005 Battery Eliminator is center negative at least on Fluke 744. I guess BE9005 should be too. I've just tested my 744 with center positive voltage from a lab supply. :popcorn: It does not conduct in that polarity. At least, no current was shown on the supply down to mA.  I haven't tested above 7.5 V though... 744 still works after this test.
mairo:
Also confirmed on 743B, center is negative, I repeat center is negative.
Why Fluke is not specifying this!? It is not marked on the unit (even voltage is not given), not mentioned in the manual apart of only to use  BE9005 Battery Eliminator, and its datasheet also does not show or mention about it  :palm:

Initially I tried with center positive with 7.5V and it did no work, but also did not get damaged. The reason I tried it with center positive is because after some search with no result I saw a third-party adapter in eBay that was advertised as center positive and apparently an alternative for Fluke's BE9005 Battery Eliminator   |O

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