Atec Com-Power-CGC-255 - Manual

D-5
Conducted Comb Generator
Features
Quick LISN Verification
Switchable Frequency Steps
Amplitude Stability: +/- 0.1 dB
Battery Powered
Two Year Warranty
Description
The CGC-255 and CGC-510 Conducted Comb Genera-
tors are reference signal sources for testing Line Imped-
ance Stabilization Networks (LISN). The Comb genera-
tor 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 exter-
nal line voltage, AC or DC up to 230 V. This feature al-
lows 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 addi-
tion, the Comb Generator’s internal monitoring circuits
provide indication to the user when the battery drops be-
low operating 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 set-
ups. These Comb Generators were designed to plug di-
rectly into the EUT power socket of the LISN. The con-
ducted 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 inter-
vals. However, test equipment malfunctions may occur
between any calibration interval and may go undetec-
ted 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 per-
form verification of the conducted test setup more fre-
quently 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 filters.
CGC-255, CGC-510