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Electronics => Metrology => Topic started by: Echo88 on February 21, 2018, 06:04:53 pm

Title: Fluke 5500A Multifunction Calibrator: Short Teardown
Post by: Echo88 on February 21, 2018, 06:04:53 pm

Today i had the chance to take a few photos of a defective Fluke 5500A which we have at work. I couldnt find the error and will reassemble it tomorrow, so it can be repaired by Fluke. So if there are any needs for more photos of a particular board say it now. Enjoy.  :)

Outer case photos and manuals can be found here: https://doc.xdevs.com/doc/Fluke/5500A/ (https://doc.xdevs.com/doc/Fluke/5500A/) Also pictures of the Keyboard Assembly, which i didnt take photos of.

Time limited repair attempt failed, but heres the repair-thread: https://www.eevblog.com/forum/repair/fluke-5500a-startup-error/ (https://www.eevblog.com/forum/repair/fluke-5500a-startup-error/)

Title: Re: Fluke 5500A
Post by: Echo88 on February 21, 2018, 06:06:27 pm

The reference on A6_2 shows the LTFLU-1ACH flying in the breeze, they didnt even bother to squeeze it in a heated enclosure. Of course its sufficient to this mediocre class of calibrators but it kinda hurts to see.

Title: Re: Fluke 5500A
Post by: Echo88 on February 21, 2018, 06:13:06 pm

All in all it was interesting to disassemble it, but of course it doesnt come close to a Fluke 57XX Calibrator with all its shielding and TaN-Resistornetworks.  ;D

Title: Re: Fluke 5500A Multifunction Calibrator: Short Teardown
Post by: TiN on February 22, 2018, 12:14:43 am

Thank you for photos.

LTFLU in these is very same REF as used in Fluke 8842A, even resistor is same ;).

(https://xdevs.com/doc/Fluke/57LFC/57LFCref.png)

Title: Re: Fluke 5500A Multifunction Calibrator: Short Teardown
Post by: dl1640 on February 23, 2018, 12:48:49 am

Looks A6 was repaired, residual flux on U45.