Thermocouple power meter

Patent · Tue Dec 09 04:00:00 EST 1986

OSTI ID:6920352

Powell, R

A meter is described for measuring an RF power, the meter comprising: thermocouple means for converting RF power into a d.c. signal which varies with the RF power level; means for establishing a sinusoidal signal having an offset from a reference level; chopper means for receiving and chopping the d.c. signal; and means for driving the chopper means with the offset sinusoidal input, the chopper means driven with the offset sinusoidal input providing an output signal that includes a series of sinusoidally-shaped, single-polarity pulses, the pulses varying in amplitude with the d.c. signal received by the chopper means; and means for producing from the chopper means output signal, a signal at a predetermined harmonic frequency of the sinusoidal input, wherein the predetermined harmonic signal varies in amplitude with the amplitude of the chopper means output signal.

• Assignee: Weinschel Engineering Co., Inc., Gaithersburg, MD
• Patent Number(s): US 4628256
• OSTI ID: 6920352
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
AMPLITUDES
CURRENTS
DESIGN
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
HARMONICS
MEASURING INSTRUMENTS
METERS
OSCILLATIONS
POWER METERS
PULSES
RF SYSTEMS
SIGNALS
THERMOCOUPLES