Products > Test Equipment
Best handheld dmm, at any price?
Alex P:
--- Quote from: VEGETA on April 11, 2018, 12:35:04 pm ---
--- Quote ---No DMM is going to measure capacitors accurately. You need an LCR meter for that.
--- End quote ---
I wish to understand this. Why would it be like this? not even the high quality meters? So why they put such a feature if it is not accurate (not reliable)?
--- End quote ---
Measuring capacitance is a bit of a black art. Capacitance can depend on frequency, temperature, even the applied voltage. Then there's ESR / delta etc. Strangely, people seem to be more at ease with capacitors than with inductors.
It's there as a feature because people want it, not because they know what the measurement is worth.
Fungus:
--- Quote from: Alex P on April 11, 2018, 07:57:03 pm ---It's there as a feature because people want it, not because they know what the measurement is worth.
--- End quote ---
They can confirm the number printed on the side of the capacitor. If the reading is much less than that then you know the capacitor should be binned.
OTOH that number doesn't tell you much about how the capacitor will perform in a real circuit, an LCR meter can tell you a lot more about that.
VEGETA:
But lcr meter requires getting the cap desoldered from the board.
bd139:
You can't measure the cap value in circuit. You're then measuring the circuit's capacitance.
VEGETA:
--- Quote from: bd139 on April 11, 2018, 08:53:23 pm ---You can't measure the cap value in circuit. You're then measuring the circuit's capacitance.
--- End quote ---
yes, that is required too.
Anyway, I wanted to know how +400$ DMM cannot measure capacitance accurately while a lot less LCR meter can do it perfectly. They both have MCU and ADC to do the final job... so why?
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