Products > Test Equipment
Protek D620: 100,000 count forgotten multimeter.
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jchw4:
I placed a thermistor on top of LT1004, fired up air con and did some logging of a LM399A-based 10V reference.

(Extracting data from the screen photo is pretty painful  :( Could somebody share the orifigal communication software and a user manual? Anyone?)

Playing with numbers I created a pretty close approximation of the value based on temperature (see PPM graph). So it seems like my meter has about 90 PPM/C.

It certanly worth improving. Install MAX6325 instead of LT1004?  But I don't have equipment to calibrate it later, so it's probably not going to happen.


Upd: reattached the photos.
jchw4:

--- Quote from: NoisyBoy on May 15, 2023, 06:33:43 pm ---Odd choice for button backlight, when each button looks the same without any writing on it.  They must assume the user would remember the function of each button. 

--- End quote ---

It's not backlight. It's glow-in-the-dark plastics ;)
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