This website uses cookies to implement certain functions. If you use this website you agree to our Privacy Policy.
News and Information about the Test of Electronics in Research & Design, Production, Maintenance, and Installation.  

Newsletter

Register to our newsletter
Every two weeks -
all news at a glance
captcha 

News - Board and System Test

Comb Generators for EMC Testing

Saelig TekBox Comb16 August 2017 - Saelig Company announced two new TekBox TBCGx Comb Generators for EMC testing. The TBCG1 is a radiating comb generator with an internal dipole antenna and a base frequency of 100 MHz. It radiates a comb spectrum that is characterized up to 6 GHz. The comb generator is intended as a quick reference for testing radiated noise measurements in anechoic chambers, TEM/GTEM cells, shielded chambers, or to gauge the effectiveness of cable shielding and other shielding materials.

With its built-in dipole antenna the TBCG1 can be used in three orientations to emit vertically- or horizontally-polarized signals. It is a compact and portable device, powered by a 9V alkaline cell. Being self-contained and battery-powered, there are no cables to disrupt the emitted field.

The TBCG2 is a versatile, passive comb generator/frequency multiplier which takes a square-wave input and creates a wide spectrum of comb frequencies. Based on a step-recovery diode design, this comb signal generator is optimized for an overall flat spectrum with an output frequency range from 1MHz to 2.5GHz. The recommended drive power is between +10 dBm and +20 dBm with an input frequency of 1MHz to 350MHz. The TBCG2's capability to work with such low drive frequencies makes it also suitable for the measurement of cable resonances. Cables on a product can themselves act as an antenna, causing radiated emissions and possible compliance test failures. They can resonate at their half-wave frequency and magnify any harmonic currents in the cable shield near that resonance. The resonant frequency of cables and wires in a product or system can be characterized by injecting harmonic energy from a comb generator into the cable and observing the resultant resonances on a spectrum analyzer; a primary peak will show where the harmonic content is resonant.

Every EMC test engineer should own a harmonic comb generator that produces a simultaneous set of harmonically related CW signals whose spacing is based on a fundamental oscillator frequency. The harmonic amplitudes produced are consistent and can be used as a frequency and amplitude calibrator, insuring, for example, that a semi-anechoic test chamber is reading correctly from day to day. Simply place the TBCG1 generator on a turntable and measure specific harmonics each day and record the trend data. Loose connectors or bad cables can be detected by comparing the current readings with past data. This will fulfill the requirement for "equipment verification testing" as specified in ISO 17025.

www.saelig.com/



Upcoming Events

ECOC 2017
Gothenburg (Sweden)
17 to 21 September 2017
enova 2017
Paris(France)
19 to 21 September 2017
EUROPEAN MICROWAVE WEEK 2017
Nuremberg (Germany)
08 to 13 October 2017

Social Media

twitter_follow_420x50px