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| Multimeter Overclocking |
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| beenai2018:
--- Quote from: GigaJoe on July 12, 2023, 03:03:00 pm ---had play a lot with an oscillator change, some DMM behave when battery voltage drop. most negative - caps measurement need divide. and beeper in ultrasound range. my daily overc locked owon bt41 - speed , especially resistance range change, very very comfortable ... --- End quote --- oh no . Forgot to mention this . The beeper is the best part . The original ex430 has a very annoying beeper |O (effective). And they doubled it up (2 beepers) for jack detection. Why not just use a diode OR?. Lol Overclocked(and gets better at higher overclocks) , the beeper sounds like a soft "schnick" . Sounds very nice. Helps loads when testing continuity. |
| beenai2018:
--- Quote from: Fungus on July 12, 2023, 05:46:28 pm --- --- Quote from: beenai2018 on July 12, 2023, 05:45:15 pm ---Frequency --- End quote --- Oh, yeah... "frequency". Definitely not going to work afterwards. :-DD --- End quote --- Ha ha . Touche |
| beenai2018:
--- Quote from: Kleinstein on July 12, 2023, 05:21:22 pm ---The resistance ranges are often slow due to autoranging. It takes some steps to get from the highest range to the low resistance range. The ADC itself may still work kind of. Most of the modern DMM chips sets use some kind of sigma delta ADC and may also work with a somewhat high clock, though with some change in the performance (noise, INL, gain). One problem is that depending on the clock the 50/60 Hz suppression may no longer work and this would often cause quite some extra "noise". Common integration times are something like 100 ms, 200 ms , 500 ms and one thus has a chance to find a higher suitable clock. With a change in input bias and possible gain the readings may be something like 10.1-1% off, which may not be obvious, but could still be an issue. Another point is that the supply current of the ADC would also go up, maybe proportional to the clock. So the battery may not last as long. --- End quote --- PLC is a thing I missed (didnt consider it ) when testing . However , both modified and unmodified units compared well on the the most sensitive ranges and ,(my most) scary range of AC 120 . Tests passed (My pass criterion is to be within 5-10% of each other for modified and unmodified meters) DC 3 uA-4000uA 5-300mA 1A-3A (meter can do 10) Resistances 1 ohm - 1 MOhm Volts 10mV - 30V AC 120V Temperature ,Diodes Mode, Continuity Mode - Pass Tests Failed Hz(y=Kx) , Cap (y= Kx) There are definitely more tests (corner cases , ruggedness) etc possible , but these basics are a good starter. |
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