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| Fluke 8840A/8842A and AF Differences? |
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| Chris56000:
Hi! Can any Members who are "au fait" with the Fluke 8840A/8842A and AF suffix models summarise the differences between them, what the suffixes mean, and suggest which model to chose for bench hobby use please? Quality of the VFD isplay is now obviously not a problem as I've bought one of the new LED Display Replacement Kits! Chris Williams |
| AVGresponding:
The A/AF is a US military specced version (Army/Air Force) that has the capability to do ratiometric measurements using the rear terminals and an external v-ref: https://www.eevblog.com/forum/testgear/fluke-8840aaf-vdc-ratio/ |
| J-R:
For hobby use, I think you will be fine with any of the four permutations, just make sure it has the AC module installed. |
| alm:
The 8842A has tighter specs than the 8840A due to better resistors, and possibly better selected parts. But honestly the specs of any of the 8840 models are great for a 5.5 digit meter. The 8842A also has some lower ranges (20 mV DC, 200 mA DC and 20 Ohm). Check the data sheet. Indeed pay attention that AC and GPIB were optional, and that the option check mark on the back may not be 100% reliable. The 8840A/AF came with the AC option installed, but that doesn't mean it can't have been removed later. |
| AVGresponding:
The low current range on the 8842 is 20mA. They are exceptionally good meters; I was lucky and got my 8840A with AC option (but no GPIB) for £100 shipped. I recently saw a parts only 8842A with broken display and obvious signs of being put together from multiple machines go for £160 + shipping! :palm: |
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