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absorbing accuracy attenuation balance balanced bridge band basic bead bias power bolometer mounts bolovac bridge circuit broadband calibrated directional coupler cell coaxial lines Cullen d.c. bias d.c. calibration d.c. power d.c. resistance described developed devices direct current dry-load effective mount efficiency Engen enthrakometer equipment error limit film bolometer flow calorimeter frequency range heat ibid impedance match impedance methods indicated input power input v.s.w.r. instruments matched mean power measurement of power microcalorimeter microwave measurement Microwave power measurement microwave power meters millimetric milliwatts mount loss obtained operation plunger power dissipated power levels power meter precision Proc pulse power r.f. power radio-frequency power rectangular waveguides reflection coefficient resistance-type milliwattmeters resistive films resistor rise in temperature Section standing-wave static calorimeter substitution error techniques temperature rise termination thermal thermistor mount thermocouple Thermoelectric cooling thermopile output tion tractorial tunable voltage water load waveguide wavelength wire bolometers wire-bolometer mounts