The Model T477W Bonding Meter is designed to accurately measure resistance, less than 2.0 ohms, as required by electrical bonds. The unit is approved for use in hazardous environments such as around aircraft, fuel installations, fuel cells, and gas systems.
Four resistance ranges are provided for measurement sensitivity. These are 2, 20, 200 and 2000 milliohms full scale. Operation of the TEST button automatically changes the range to the next highest range each time it is depressed.
Continued operations of the TEST button recycle the range changes. Resistance measurements are made using a hand grip probe connection. The hand grip probe (P/N C22161) is easy to use with convenient hand grips for firm control and needle points for sure penetration of surface coatings. The hand grip probe is easy to use in tight areas such as around wing tanks.
Battery capacity is adequate for eight (8) hours of continuous operation. Power is conserved by a 52 second timer which automatically powers down the display. Operation and display are initiated by depressing the TEST button. Built-in display illumination provides for use at nighttime or with inadequate ambient light. These features allow high accuracy and simplified set-up.
