There’s hardly any piece of test equipment more fundamental than a volt ohm meter. Today you’re likely to have a digital one, but for most of history, these devices had real needle meters.

They are used to facilitate the operation of instruments such as relays, volt and amp meters. Current Transformers (CT) are instrument transformers used for current metering and protection through the ...

The 1689 has a front-panel analog volt and amp meter and the 1690 employs digital LEDs. Mutual features include a ripple and noise figure of 5 mV p-p, 5 mV/±2% line regulation, and a load ...