Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With waveguide or long line
Patent
1991-01-22
1993-02-09
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With waveguide or long line
324142, 338 51, 338250, 455115, G01R 2106, H01C 108, H03C 162
Patent
active
051855682
ABSTRACT:
The invention describes an internal test load and method for forming an internal test load which is adapted to absorb energy from a power source such as an RF transmitter, transceiver, or amplifier. The test load is positioned internally within a housing, and includes at least one impedance device, such as a power resistor, coupled to the power source which is matched to the impedance thereof. The impedance device is supported on a heat sink which is adapted to absorb heat generated by the impedance device so as to be distributed over a relatively large area constituting the heat sink. The heat sink is positioned in spaced part relation to the housing, and is not directly supported or secured to the housing. A potting material surrounds the load assembly and supports the heat sink, wherein the heat sink effectively "floats" within the potting material such that heat absorbed by the heat sink will not be directly transferred to the housing, but will be dissipated through the potting compound. As an example, the internal test load is applied to an RF watt meter for testing low power RF transmitters, transceivers and RF amplifiers without an external load or antenna connected separately thereto. The test load may be mounted on a heat sink comprising an aluminum plate having a significant thickness. The potting material may be a strong, lightweight epoxy material, which may include a large number of air pockets therein, to facilitate dissipation of heat from the heat sink and to slow the transfer of heat to the housing in which the internal test load is positioned.
REFERENCES:
patent: 2457597 (1948-12-01), Osterheld
patent: 2676238 (1954-04-01), Coates
patent: 2702334 (1955-02-01), Kleist
patent: 2946005 (1960-07-01), Waterfield et al.
patent: 3345561 (1967-10-01), Martin
patent: 4124794 (1978-11-01), Eder
Keim John E.
Mothersbaugh James M.
Circle Prime Mfg. Co.
Karlsen Ernest F.
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