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Comb generators are useful for testing radiated
noise measurements and shielding effectiveness.
Fairport, NY, USA: Saelig Company, Inc., announces the
availability of two new
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 9 V 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 1 MHz to 2.5 GHz. The recommended drive power is between +10 dBm
and +20 dBm with an input frequency of 1 MHz to 350 MHz. 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.
TBCG1 Radiating Comb Generator Specifications:
- Base frequency: 100 MHz
- Comb spectrum: 30 MHz - 6 GHz
- Tolerance: +/- 2.5 dB
- Power supply: 9 V alkaline battery
- Current consumption: 175 mA
- Dimensions: 3.2" x 2.4" x 1.1"
- Weight (incl. 9 V battery): 3 oz
TBCG2 Comb Generator Specifications:
- Input Power: +10 dBm to +20 dBm; 25 dBm max.
- Input Frequency: 1 MHz to 350 MHz
- Comb spectrum: 1 MHz - 2.5 GHz
- Input connector: N female
- Output connector: N male
- Dimensions: 3.2" x 1.1" x 1.1"
- Weight: 3.5 oz
Manufactured by Singapore-based Tekbox Digital Solutions, the TekBox TBCGx Comb Generators
are available now from their authorized North American distributor Saelig Company, Inc. Fairport,
NY. For detailed specifications, free technical assistance, or additional information, please
contact Saelig at 888-7SAELIG, via email: firstname.lastname@example.org,
or by visiting http://www.saelig.com/category/MFR00154.htm.
About Saelig Company, Inc.
Founded in 1988 in Rochester, New York, Saelig is a North American distributor with a growing
reputation for finding and sourcing unique, easy-to-use control and instrumentation products
and related active components, for use in a variety of industries. Products lines are continuously
added from sources across the globe, and are offered at highly competitive prices, accompanied
by full in-house technical support, exceptional customer service, and fast delivery. For full
details of available product lines, please visit
Saelig Company, Inc.
71 Perinton Parkway
USA Toll-Free: (888) 7-SAELIG
Tel: (585) 385-1750
Posted July 19, 2017