No, I don’t have a special application. The other day I turned on one of my two meters just to be greeted with “Uncalibrated”, after I just replaced the batteries in the spring. I measured the battery and it was at 22mV. I measured the good one and it was 3.6V so basically right where I left it in March. I went to buy a new battery and out of four that I measured, one was dead, one was at 3.4V, so it was discharging internally, the other two were around 3.67V. You can’t trust anything anymore, bad quality everywhere.
Luckily, I saved the calibration memory before replacing the batteries so I thought, how nice would be just to connect the USB cable and upload the constants back using lmester’s free control program, since the extension is there anyway and it has GPIB capabilities.
I’m just trying to be greedy at your expense.
BTW, I tried your new version with variable tone. I assembled two new boards for that, I didn’t want to jinx the existing ones by replacing the internally driven buzzers, just in case I didn’t like it.
It’s really good, not too much variation in the buzzer level as I expected. However, I have a suggestion, you know by now that I always have one to the desperation of another member here
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Most of the time I use the continuity function to check for, well, continuity and that high pitch is bothersome. Can you separate this function in two? Make one “CONT” with a fixed frequency like before, and the other one “SHORT DET” or “CONT VAR” for short detection.
One more thing, the beep in autohold is a bit too long for me and compared to Fluke.
I like the latch though.
Again, great project, thanks for the effort Kirill. This is my go to meter for almost everything after I added your extension and my backlight.