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Video Blog #019 - Keithley 2015 THD DMM Display Replacement

DISCLAIMER: This video is educational only, so if you decide to do the same yourself then you are on your own, I can't be held responsible for any problems/issues/damage/injury that may occur if you decide to follow this blog and try it yourself.


The VFD (vacuum fluorescent display) of my Keithley 2015 THD multimeter (my primary bench meter) has aged and faded. Light output drops over time due to falling emission and reduction of phosphor efficiency. One possible fix is to raise the filament voltage slightly but as my display was particularly uneven in terms of brightness so I decided just to change it out and give the meter a 2nd life.

So, after purchasing a new display I dismantled the meter and replaced the VFD.

In the video I take the meter apart, remove the front panel, extract the display board and desolder the VFD. After that it's a quick job to re-assemble, power up and then compare the result to my other 2015 THD on the workbench.

Tektronix sell all manner of parts for the 2015 THD including the display of which cost me £53+vat each. Delivery took about a week.