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Maxim Kudryavtsev2015-02-08 21:18:43
Do it yourself
Maxim Kudryavtsev, 2015-02-08 21:18:43

Is the capacitor blown?

Good day.
I have a board, there are a number of capacitors on the board (usual, like this (picture) approximately). On the net, I googled the method "Checking capacitors with a digital multimeter." I put mine on 2 megaohms, touch the capacitor legs with probes, but instead of 1 (one) on the multimeter display, I see 000 (three zeros). Please tell me, is this normal behavior or should I change them?
I don’t solder the capacitors from the board, it hasn’t been powered for 3-4 days, if it matters.

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2 answer(s)
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Andrey Ermachenok, 2015-02-08
@eapeap

Can be called through the scheme. Solder to check.
But what's the point? At 9V, it may not break through, but at an operating voltage of 220V, it may break through.
Is the payment working or not? What's the fee? Otherwise - talking about nothing.

A
Armenian Radio, 2015-02-08
@gbg

The capacitor must be discharged before testing, that is, shorted through a resistor and held for a certain time (5RC seconds, R is the resistance in farads, C is the capacitance in ohms). The choice of resistor depends on the capacitance and voltage of the capacitor and should be such that the discharge current is no more than 0.5A.
Discharging a capacitor, especially a high-voltage and larger one, by shorting it is fraught with an explosion or damage to the latter!
To reliably check capacitors, an ESR meter and capacitance meter should be used.
In extreme cases (from poverty), one can indirectly judge the capacitor by the intensity of movement of the arrow of the analog multimeter (when measuring the "resistance" of the capacitor, the arrow should first sharply drop to 0, after which it should slowly creep (depending on the capacitance) to infinity).
Checking with a digital multimeter, as a rule, is not very informative.

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