1
Chapter 1 Introduction
Bird 8890 Series Semiconductor loads are portable, 50 ohm, coaxial
RF transmission line terminations. They are designed for frequency
ranges of dc – 28 MHz, specially calibrated for greater stability at
13.56 MHz. They provide accurate, dependable, and low reflection
line terminations. Up to 2500 watts of RF power can be dissipated.
The load has a coolant chamber surrounded by radiator fins. The
front and rear fins form mounting flanges which can be used as
supports for freestanding use or as brackets for fixed mounting. A
vent plug at the top of the unit relieves internal pressure from coolant
expansion. The load’s simple and rugged design minimizes
maintenance requirements.
Items Supplied y Load Resistor: Pre-filled with coolant at the factory
y Shipping Plug
y Vent Plug
y Instruction Manual
Items Required but
not Supplied
y Coupling Kit: Connects the load to the RF line
Optional
Accessories
y Interlock Thermoswitch: Automatically shuts off the RF generator
to prevent overheating of the load
CAUTION
The Bird 8890-300SC13 is not designed for use with a blower. Do
not install a blower on the unit. Doing so will void the warranty.
