The Fluke Model 77 IV/BN is a battery-powered, average responding-rms indicating multimeter (hereafter "the Meter", with a 6000-count, 3 3/4 digit display and a bar graph.
This meter meets CAT III and CAT IV IEC 61010 standards. The IEC 61010 safety standard defines four measurement categories (CAT I to IV) based on the magnitude of danger from transient impulses. CAT III meters are designed to protect againts transients in fixed equipment installation at the distribution level; CAT IV meters are designed to protect against transients from the primary supply level (overheard or underground utility service).
The Meter measures or test the following:
- AC/DC voltage & current
- Voltage frequency