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Meter safety

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While building a transmitter recently, a problem arose concerning the method to be used in protecting exposed meter terminals. The solution finally evolved from the use of a pair of ceramic plate caps is shown in the accompanying photograph. Most meters of the 2½ inch variety or larger come with a pair of washers on the terminals. When the terminal nuts are tightened down on the washers, Millen No. 36002 or National SPP-3, 3/8 inch plate caps should slide over the washers, forming a tight connecton. If these fit too loosely, perhaps a modification of Millen 36004 will serve better.

Of course, before the caps are placed on, the leads for the meter should be soldered to the cap connections.

Pic 1
Plate caps used to protect exposed meter terminals.

A. Gordon Davis, KN1LY.