Fluke 115 EEpr error - rewriting MSP430F448

[tfm]

Hi,

I have an offer on a Fluke 115 for about USD 30,00. This unit was working and all of sudden started continuously showing the EEpr error.

Here is a teardown: https://www.youtube.com/watch?list=PLDBuVMDVJaX0MeCqN7ZFN_zlHAd8vzLmi&v=FnTi6n4lYNo&embeds_referring_euri=https%3A%2F%2Fwww.mjlorton.com%2F&source_ve_path=Mjg2NjY&feature=emb_logo

This unit has no external EEPROM, it seems like everything is handled/stored by the MSP430F448 MCU, so I assume this error must be a software error or some internal register got damaged.

I wonder what could have caused it, say cosmic rays?? Or any other more mundane cause?

Has anyone succeeded in reading the MCU's contents and rewriting it in another unit? The latter would require a new cal, of course.

 

[Arhigos]

Hi,

I have an offer on a Fluke 115 for about USD 30,00. This unit was working and all of sudden started continuously showing the EEpr error.

Here is a teardown: https://www.youtube.com/watch?list=PLDBuVMDVJaX0MeCqN7ZFN_zlHAd8vzLmi&v=FnTi6n4lYNo&embeds_referring_euri=https%3A%2F%2Fwww.mjlorton.com%2F&source_ve_path=Mjg2NjY&feature=emb_logo

This unit has no external EEPROM, it seems like everything is handled/stored by the MSP430F448 MCU, so I assume this error must be a software error or some internal register got damaged.

I wonder what could have caused it, say cosmic rays?? Or any other more mundane cause?

Has anyone succeeded in reading the MCU's contents and rewriting it in another unit? The latter would require a new cal, of course.

Based on symptoms I think most likely yours chip just died .

So you probably need to get a new chip, solder, program, do calibration adjustment and calibration verification..

Probably easier to get a new meter