Atec CGC-255 User Manual
Features
Quick LISN Verification
Switchable Frequency Steps
Amplitude Stability: +/- 0.1 dB
Battery Powered
Two Year Warranty
CGC-255, CGC-510
Conducted Comb Generator
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 conducted EMI noise. The CCG series Comb Generators hav e
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 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 Generators 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 per form verification 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 components, such as cable shields and filters.
D-5
Specifications
FREQUENCY [MHz]
Graph for Peak
Model CGC-255
250 kHz step size
AMPLITUDE [dBuV]
10
20
30
40
50
60
70
80
90
100
110
0.25
30
1
10
CISPR22 CLASS A - AVERAGE LIMIT
FREQUENCY [MHz]
Graph for Peak
Model CGC-510
500 kHz step size
AMPLITUDE [dBuV]
10
20
30
40
50
60
70
80
90
100
110
0.5
30
1
10
CISPR22 CLASS-A - AVERAGE LIMIT
ValueTronics International, Inc. - www.valuetronics.com - 1.800.552.8258 or 1.847.468.8258
Usable Frequency: CGC-255: 50 kHz step mode 50 kHz-30 MHz
CGC-255: 250 kHz step mode 250 kHz - 30 MHz
CGC-510: 100 kHz step mode 100 kHz - 30 MHz
CGC-510: 500 kHz step mode 500 kHz - 30 MHz
Connector Type: 3 pin male plug which mates with
standard US 115 V AC socket
Battery Charger Input: 6 V DC, 500 mA
Battery Type: 4.8V NiCad rechargeable battery pack
Dimensions: 5 x 2.25 x 2.25 inches (13.2 x 5.9 x 5.9 cm)
Weight: 1 lb. (0.5 kg)
Operating Temperature Range: 0 ° C to 40 ° C
Typical Output (Direct)
Graph for Peak
110
100
90
]
80
70
60
50
AMPLITUDE [dBuV
40
30
20
10
0.1
0.05
Model CGC-255
50 kHz step size
CISPR22- CLASS A- AVERAGE LIMITS
1
FREQUENCY [MHz]
10
30
50 kHz step
Graph for Peak
110
100
90
80
70
60
50
AMPLITUDE [dBuV]
40
30
20
10
0.1
100 kHz step
All values are typical values unless specified.
All specifactions are subject to change without notice.
D-6
Model CGC-510
100 kHz step size
CISPR22 CLASS A - AVERAGE LIMIT
1
FREQUENCY [MHz]
10
30
250 kHz step
500 kHz step
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