Multiple Frequency Harmonic Comb Injector Greatly Eases EMI Testing

Multiple Frequency Harmonic Comb Injector Greatly Eases EMI Testing has released a new test signal generator for EMI testing applications. The USB Harmonic Comb Injector, the latest edition to Picotest’s popular line of Signal Injectors, is a fast, easy-to-use, ultra-portable harmonic comb signal generator for interrogating your Power Distribution Networks (‘PDN’) to identify noise sensitivities. A comb signal generator is simply a device that produces a set of harmonically related CW signals whose spacing is based on a fundamental oscillator frequency. Other applications include a general purpose source for characterizing semi-anechoic chambers (for measurement consistency day-to-day, and comparing one chamber to another) and as a source for measuring cable, or other metallic structure, resonances especially for those who do not have access to a tracking generator on their spectrum analyzers, or those who do not have a network analyzer.

The comb injector includes impulse & square wave outputs and has multiple modes of operation including time and frequency jitter. It is designed for power supply and clock EMI spectrum testing and has a usable frequency range of 1kHz to 1.5GHz with edges as fast as 300ps. The comb injector is USB powered with a single SMA output connector. No external power supply is necessary.

There are 5 modes of operation available including 1kHz impulse, 100kHz impulse, and 8MHz impulse output, each with frequency and pulse width dithering, a stepped mode that continuously steps between the three impulse modes and a 1kHz square wave output mode that is convenient for step load testing. Modes are changed via a convenient pushbutton on the injector key with a color LED indication of the active mode.

“The portability of this EMI injector is an advantage over current competitive solutions. The variable frequency comb is tremendously useful accessory to the Keysight E5052B and N9020A, Tektronix RSA5106A and RSA306, R&S FSW, FSMR and FSUP and virtually all oscilloscopes” says Steve Sandler, CEO of Picotest. “With it I can conveniently test Power Integrity and various EMI performance characteristics without having to carry around an AWG.”

The price of the Comb Injector is $895 in single quantities and is available now from Picotest . The Injector is compatible with all 50 ohm instruments. 

More information: Picotest