SYLVANIA PM8 RF Power Measurement Lamp
Lampe de mesure de puissance RF
Lampe für RF-Leistungsmesser
The PM8 is one of a series of Sylvania power measurement lamps (PM-3 through PM-8), used for
measuring RF power in watts in HF systems up to 100 MHz. They came out in October 1943.
Converting the RF power to light is known as the photometric technique. The lamp contains two
identical filaments. One filament is fed from the source of unknown RF power, while the other is lit by a known
adjustable DC or low-frequency AC source. When you adjust them to equal brightness, the RF power is assumed to be
the same as the DC or low-frequency AC power.
Hauteur • Height • Höhe : 69 mm • 2" 3/4
Diamètre • Diameter • Durchmesser : 29 mm • 1" 1/8
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