Abstract: An electronic measuring device includes a main printed circuit assembly and one or more channel modules. At least one channel module includes a channel printed circuit board and a first insulating housing that defines a cavity covering at least part of electrical elements mounted on the channel printed circuit board. A first conductive shielding frame is placed on the first insulating housing and is separated from the channel printed circuit board by the first insulating housing. The first conductive shielding frame covers the electrical elements mounted on the channel printed circuit board. A second insulating housing sandwiches the first conductive shielding frame between the second insulating housing and the first insulating housing which lengthens an electrical path from the first conductive shielding frame to the channel printed circuit board.

Abstract: An electronic measuring device includes a main printed circuit assembly and one or a plurality of channel modules. At least one channel module includes a channel printed circuit board and a first insulating housing that defines a cavity covering at least part of electrical elements mounted on the channel printed circuit board. A first conductive shielding frame is at least partially disposed on the first insulating housing and separated from the channel printed circuit board via the first insulating housing. The first conductive shielding frame covers the at least part of the electrical elements mounted on the channel printed circuit board. A second insulating housing on the first conductive shielding frame is configured to sandwich the first conductive shielding frame between the second insulating housing and the first insulating housing so as to lengthen an electrical path from the first conductive shielding frame to the channel printed circuit board.

Abstract: A radio frequency (RF) power source having a precise power detector includes a RF signal generator, a RF power amplifying circuit, a power supply circuit, and a precise power detector. The precise power detector includes a voltage mutual inductor, a current mutual inductor, a precise detecting module, and a microcontroller integrated with an analog-digital (A/D) converter and a micro-processing unit, wherein the voltage mutual inductor and the current mutual inductor are respectively connected with the precise detecting module. The precise detecting module includes an add circuit, a subtraction circuit, a rectification circuit, and a filtering-amplifying circuit, wherein the add circuit and the subtraction circuit are respectively connected with the rectification circuit, the rectification circuit connects to the filtering-amplifying circuit, the filtering-amplifying circuit connects to the microcontroller integrated with the A/D converter and the micro-processing unit.

Abstract: A radio frequency (RF) power source having a precise power detector includes a RF signal generator, a RF power amplifying circuit, a power supply circuit, and a precise power detector. The precise power detector includes a voltage mutual inductor, a current mutual inductor, a precise detecting module, and a microcontroller integrated with an analog-digital (A/D) converter and a micro-processing unit, wherein the voltage mutual inductor and the current mutual inductor are respectively connected with the precise detecting module. The precise detecting module includes an add circuit, a subtraction circuit, a rectification circuit, and a filtering-amplifying circuit, wherein the add circuit and the subtraction circuit are respectively connected with the rectification circuit, the rectification circuit connects to the filtering-amplifying circuit, the filtering-amplifying circuit connects to the microcontroller integrated with the A/D converter and the micro-processing unit.