User Manual

Comb Generator
Features
Application
EMI measurement are usually conducted in Open Area
Test site (OATS) or an Anechoic chamber. OATS and
chambers must be calibrated before it is put into ser-
vice using published calibration procedures at regular
intervals. These calibration methods are too elaborate
and time consuming to be performed before each test
to ensure that the data taken is consistent and accurate.
The Comb Generator is a quick site verifi cation tool. The
test engineer will be able detect potential problems with
site by maintaining a log of the Comb Generator radiated
readings prior to taking measurement from a product
in the same setup. For instance, test engineer will able
to detect problems with antennas, cables, preamplifi ers
and receiver immediately by comparing previous Comb
Generator data in the same setup. The same method can
be utilized when EMC emissions measurements taken
from the same products varies when the test is repeated.
It is diffi cult to determine if it is the test site or the
product is causing the variation. Using the same test
setup, measurement can be taken with a Comb Generator
in place of the product. This data can be compared with
previous Comb Genertor measurements to determine
the problem. Other uses of the Comb Generator output
include testing cables and fi lters.
Description
The CGO- Comb Generator is reference radiated or con-
ducted signal source. The signal contains frequency har-
monics at 1,5, 20 MHz intervals. These reference signals
are used for validating EMC test sites. A reference signal
source must have stable and precise output. Therefore, Comb
Generator’s internal circuit is built to meet this requirement.
Two antenna supplied with the Comb Generator for low
and high frequency signal radiation.The radiated signals
are generated by connecting one of the two antennas to
the BNC or SMA connector . The circular chassis of Comb
Generator helps radiate the signl more uniformly in all
directions in the same plane. The conducted reference
signals can be obtained by connecting a coax to the BNC
or SMA connector.
The Comb Generator is powered by a rechargeable internal
battery pack to eliminate any possibility of external cables
effecting the radiated signal. When the battery voltage
reaches below reliable operating levels the RF will shut off
automatically to prevent further use. When fully char ged,
the battery allows continuous use of the Comb Geneator
up to 18 hours. The Comb Generator , charger and antennas
are shipped in a custom wooden storage box.
Reference noise source - For site verifi cation
Output upto 4.5 GHz
Stable frequency output
Auto RF shutoff when battery voltage is low
Three year warranty
Com-Power Corporation [phone] www. com-power.com [e-mail]
CGO- 501, 505, 515, 520