Condenser Testing

Measure ohms between the two terminals with a multimeter. The value will rise exponentially. If, after a suitable delay, the figure hasn't gone off-the-scale high end ohms, the item is faulty.

That's not the way I do it. I take my meter in ohms setting and connect to the two contacts (with the cap disconnected from the wiring) (to be safe, connect the contacts together for a second to discharge the cap) (a cap is the same as a condenser for this thread) anyway, the meter will jump. Reverse the probes on the contacts, the meter should jump again. If it doesn't jump, it's bad. (jump means an analog meter needle will move across the scale and back to the starting place) (a digital meter may have a capacitance setting, that is a good way to test condensers...discharge the cap first)

Or simply, connect the capacitor to the net through a safety switch of the relevant amperage and measure the current drawn. Note that start (electrolythic) capacitors may only be connected to the net for 1 or 2 seconds.

In 50Hz net

current, +/- 7% (of a good capacitor) = its capacitance/14. (About 2,5A in your case)

I forgot to mention that the divider 14 is for 230V 50Hz.

For other voltage/freq. the number should be found experimentally.