Fluke 37

• Fluke 37
  Posted by Fungus on 04 Feb, 2021 19:23
• For posterity, here's some pics of a Fluke 37 I recently scored on eBay France (for 20 Euros plus 15 Euros shipping  )
  
  I've peeked inside and it's a Fluke 27FM arranged horizontally with added toolbox at the back and a carry handle. It matches my 27FM almost component for component even though there's about 10 years difference between them.
  
  Note that the stand can be connected at either the front or the back so it can lean up from a table or down from a shelf.
  
  Note that there's no CAT ratings printed on the front - this was made before CAT ratings were invented!
  
  Accuracy is within 1 digit on on all ranges (of course!)
  
  
  
  
  
  The top opens up so you can keep stuff inside it, eg the stand+test leads.
  
  
  
  
  

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• #1 Reply
  Posted by Fungus on 04 Feb, 2021 19:24
• More pics...
  
  
  
  
  
  
  
  
  

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• #2 Reply
  Posted by Fungus on 04 Feb, 2021 19:26
• It has a 9V DC input on the side with dire warnings to only use the official Fluke mains adapter!
  
  
  
  
  
  Extra points for deciphering the hieroglyphics on the bottom.
  
  
  
  
  
  

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• #3 Reply
  Posted by Fungus on 04 Feb, 2021 19:36
• eBay advert. Apparently the guy had 10 of them.... 
  
  

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• #4 Reply
  Posted by Fungus on 04 Feb, 2021 19:44
• User manuals that I found online...
  
  
  Note the procedure for measuring capacitance even though it has no capacitance range. You put it in an Ohms range and time how long it takes the bar graph to go to full scale when you connect it to a capacitor.
  
  ie. You charge the capacitor using the voltage from the meter when it's on Ohms range.   
  
  
  
  

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  Fluke37.pdf

  Fluke37manual.pdf

  
• #5 Reply
  Posted by Fungus on 04 Feb, 2021 20:06
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• #6 Reply
  Posted by Shock on 05 Feb, 2021 14:27
• Does it have True RMS? I think that is one of the gray Fluke 27FM differences. Looking at this video the switch seems a bit snappier, if it's anything like the 27FM it should be super reliable.
  
  I end up getting two cheap Keithley 179s but the auto ranging on these is so tempting.
  
  
• #7 Reply
  Posted by Fungus on 05 Feb, 2021 16:19
• Quote from: Shock on 05 Feb, 2021 14:27

  Does it have True RMS?
  

  
  No, although it has the same trick as a Fluke 27 up its sleeve.
  
  If you look in the manual there's a table of correction factors for various wave shapes. eg. For a square wave you multiply the value on screen by 0.9.
  
  Here's the table:
  
  
  Now the trick. The Fluke 27 and 37 will keep on showing the same value as the frequency rises, and keep on showing it long after the readings shown by my Brymen 857 and Anengs and have all gone to hell.
  
  eg. If I feed it a 3V square wave The Fluke 27+37 will show 1.66V on screen (ie. 1.5V/0.9) and keep on showing 1.66V as the frequency rises and all the others are starting to show garbage.
  
  My tests show it will keep on showing the "correctly wrong" 1.66V up to 30kHz or more. 
  
  
  nb. I have a Fluke 8060A for measuring high frequencies - it's still the king of that even after all these years.
  

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• #8 Reply
  Posted by scopeman on 27 Jan, 2022 01:32
• I wish I could find a 3D model of the flip stand for this meter as I have one that does not have it!
  
  Sam
  W3OHM