Fluke 741B & BE9005 Battery Eliminator

• Fluke 741B & BE9005 Battery Eliminator
  Posted by Alvin Purple on 12 Nov, 2021 17:15
• 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!
• #1 Reply
  Posted by Tj138waterboy on 13 Nov, 2021 00:55
• 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.
• #2 Reply
  Posted by dew on 15 Apr, 2024 16:14
• 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. 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.