| Electronics > Projects, Designs, and Technical Stuff |
| Capacitor Leakage tester issues |
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| Conrad Hoffman:
I don't have a really good photo of the GR 1617A capacitance bridge, but it does a great job with leakage measurements and reforming. It has a 20 mA maximum current range and minimum of 60 uA, which can be read down to 2 uA or so. Just to give an idea of practical values. The bias switch is a DPDT switch so you can switch it on for reforming. When switched off it puts a resistor across the cap to discharge it. This doesn't seem to affect the value and loss measurements that can be done under bias (or not), so they probably have some diode drops or a current sink rather than a simple shunt resistor. It also has a warning light to show when more than a few volts is across the cap. The front panel has various warnings about possible death if the unit isn't used correctly. The instructions suggest insulated test clips, rubber gloves and a chair insulated from ground! |
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