Manual

Conducted Comb Generator
Features
Quick LISN Verifi cation
Switchable Frequency Steps
Amplitude Stability: +/- 0.1 dB
Battery Powered
Two Year Warranty
Description
The CGC-255 and CGC-510 Conducted Comb Generators
are reference signal sources for testing Line Impedance
Stabilization Networks (LISN). The Comb generator
output has the harmonics of the fundamental frequency.
Each model has two switchable frequency step sizes. The
model CGC-255 has 250 kHz and 50 kHz and the model
CGC-510 has 500 kHz and 100 kHz frequency steps.
This Comb Generator simulates an EUT generating con-
ducted EMI noise. The CCG series Comb Generators have
the standard NEMA three blade connector that can plug
directly into any LISN with the matching EUT power
socket. Both models have a high impedance to the external
line voltage, AC or DC up to 230 V. This feature allows the
Comb Generator to be used while the LISNs are connected
to external power source.
The Comb Generators are powered by rechargeable NiCad
batteries to avoid any external noise coupling. In addition,
the Comb Generator’s internal monitoring circuits provide
indication to the user when the battery drops below operat-
ing level. A fully charged battery will power the Comb
Generator up to 16 hours. A battery charger is included
with both models.
Application
The main application of the CGC series Comb Genera-
tors is to quickly verify conducted emissions test setups.
These Comb Generators were designed to plug directly
into the EUT power socket of the LISN. The conducted
noise output level of the Comb Generators are close to
or above the CISPR 22 limits as shown on the typical
output plot on the back of this page.
Most EMI labs typically calibrate LISNs and other
equipment (spectrum analyzers, cables, connectors,
etc.) in the conducted emissions test setup at regular
intervals. However, test equipment malfunctions may
occur between any calibration interval and may go
undetected until the next calibration. In the meantime,
these malfunctions may produce erroneous test results.
This is unacceptable and can be avoided by using the
Comb Generator as a reference noise source. With the
Comb Generator, the test engineer will be able to quickly
perform verifi cation of the conducted test setup more
frequently to assure accurate test results.
Other possible applications of the CGC series Comb
Generator could include production evaluation of com-
ponents, such as cable shields and fi lters.
Com-Power Corporation [phone] www. com-power.com [e-mail]
CGC-255, CGC-510