The CGC-255E Comb Generator is a conducted reference signal source to test Line Impedance Stabilization Networks (LISN). The Comb generator output has the harmonics of the fundamental frequency. It has two user select-able frequency step sizes of 50 kHz and 250 kHz.
This Comb Generator simulates an EUT generating conducted EMI noise. The CGC series Comb Generators have the standard NEMA three blade connector that can plug directly into any LISN with the matching EUT power socket. It can be attached to any other socket type using suitable adapter. The CGC-255E has 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 an external power source.
The CGC-255E is powered by rechargeable internal NimH batteries. The battery power eliminates the need for an external cabling that may interfere with the radiated signals. When fully charged, the battery allows continuous use of the Comb Generator for up to 18 hours. The Comb Generator and the charger are shipped with a custom wooden storage box.
The main application of the CGC-255E Comb Generators is to quickly verify conducted emissions test setups. It is 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. Typical output plot is shown on the next 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. The time and resources lost due to these unforeseen errors can be avoided with the help of Comb Generator.
With the Comb Generator, the test engineer will be able to quickly perform verification of the conducted test setup more frequently to assure accurate test results. Other possible applications of the CGC-255E Comb Generator could include production evaluation of components, such as cable shields and filters.Features:
Tested at 3 meters, vertical polarization, antenna height varied from 1 to 4 meters.
|Comb Generator||50 kHz Steps||250 kHz Steps|
|Intended Application:||Reference Signal Source for LISN verification|
|Frequency Range:||50 kHz to 400 MHz|
|Frequency Step Size:||50 kHz and 250 kHz|
|Frequency Stability:||50 ppm|
|Amplitude Stability:||± 0.1 dB|
|Time Stability:||<1 dB over 12 months|
|Charger Input:||110VAC 60 Hz or 230 VAC 50 Hz|
|Charger Output:||6 VDC, 500 mA|
|Battery Type:||6V NiMH, 1 Ah|
|Operating Time:||> 18 Hours (Typical with fully charged battery)|
|External Indicators:||Battery Low & Power On|
|LISN Interface Plug:||NEMA 15-P Type|
|Dimensions:||13.2 cm x 5.9 cm x 5.9 cm / 5" x 2.2" x 2.2"|