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Modding a Keithley 197

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codeboy2k:
Great! thanks, I'll get one of those wider strips next time then.

The 1.25" width is too big, I wasn't sure if I could cut them down on two edges and have it still work (both length and width). So in the past I opted for a narrow one and I only cut the length, but it was too narrow. 

I'll give it a try.
Cheers!

tooki:
I really need to get back into this project, after successfully adding a backlight to a cheapie DMM I had lying around.

Question though: EL strips require an inverter. Do the inverters produce noise that could affect the performance of a 197, given that they have microvolt resolution?

don.r:
Has anyone found a source for suitable EL panels? My 175A backlight is very weak.

tooki:
It’s fairly easy to find suitable ones on eBay, since you can just get an oversize one and cut it to size. (My 197A has the same issue.) There are both large strips and square panels that are big enough. The thing to look for is where the power connectors are, so as to be able to match the location of the original leads. (You don’t want one where the power goes in the very corner, but rather centered so you can trim to size and still have the leads centered.)

That said, I’d love to experiment more with the diffusion films from thin edge-lit LCD panels. In particular, the film with the etched dots is very interesting, as it’s designed specifically to eject light evenly from just side lighting.)

Well, that and with making a whole replacement display PCB using an Arduino decoder to drive some nice LED, graphical LCD, or OLED display.

don.r:
OK. Ordered a white one off eBay.... and now a month or two of waiting.

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