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| 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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