Com-Power CGC-255E Comb Generator

Key Features At A Glance

• Reference signal source for LISN (Line Impedance Stabilization Network) verification in conducted emissions test setups
• User-selectable frequency step sizes of 50 kHz and 250 kHz
• Usable frequency range up to 400 MHz
• Battery operated with rechargeable 6V NiMH battery — over 18 hours of continuous use on a full charge
• High impedance to external line voltage (AC or DC up to 230 V) — allows use while LISN is connected to external power source
• NEMA 15-P plug interface for direct connection to standard LISN EUT power sockets
• Frequency stability of 50 ppm and amplitude stability of ±0.1 dB; time stability <1 dB over 12 months
• Three-year warranty; ships in custom wooden storage box with charger

The Com-Power CGC-255E is a battery-operated comb generator designed as a conducted reference signal source for verifying Line Impedance Stabilization Network (LISN) test setups. The unit generates a series of harmonics from a fundamental frequency, producing a comb of spectral lines that simulate an Equipment Under Test (EUT) generating conducted EMI noise. The CGC-255E offers two user-selectable frequency step sizes — 50 kHz and 250 kHz — with usable output extending to 400 MHz.

The primary application of the CGC-255E is quick verification of conducted emissions test setups. It plugs directly into the EUT power socket of a LISN via its NEMA 15-P interface, with conducted noise output levels close to or above the CISPR 22 limits. Beyond LISN verification, the CGC-255E is also suited to production evaluation of components such as cable shields and filters. Because most EMI labs calibrate LISNs, spectrum analyzers, cables, and connectors only at regular intervals, equipment malfunctions occurring between calibrations can go undetected and produce erroneous test results — the comb generator allows test engineers to perform frequent interim verification of the conducted test setup to assure accurate results.

Accessories Supplied

• Charger (6 VDC, 500 mA / 110 VAC 60 Hz or 230 VAC 50 Hz)
• Custom wooden storage box

Product Core & Specifications

Specification	Value
Intended Application	Reference Signal Source for LISN verification
Frequency Range	50 kHz to 400 MHz
Frequency Step Size	50 kHz or 250 kHz
Frequency Stability	50 ppm
Amplitude Stability	± 0.1 dB
Time Stability	<1 dB over 12 months
Charger Output / Input	6 VDC, 500 mA / 110 VAC 60 Hz or 230 VAC 50 Hz
Battery Type	6V NiMH, 1 Ah
Operating Time	>18 Hours Typical With Fully Charged Battery
External Indicators	Battery Low and Power On
LISN Interface Plug	NEMA 15-P type
Dimensions	5 x 2.2 x 2.2 inches / 13.2 x 5.9 x 5.9 cm
Weight	1 lbs / 0.5 kg
Warranty	Three-Year Warranty

Important: Frequency step size is user-selectable between 50 kHz and 250 kHz. The CGC-255E exhibits high impedance to external line voltage (AC or DC up to 230 V), allowing it to remain connected while the LISN is energized from an external power source.Important: All specifications are subject to change without notice. All values are typical, unless specified.Important: The CGC-255E has high impedance to the external line voltage, AC or DC up to 230 V, allowing the Comb Generator to be used while the LISNs are connected to an external power source.Important: The standard NEMA three-blade connector plugs directly into any LISN with a matching EUT power socket. It can be attached to any other socket type using a suitable adapter (adapter not included).Recommended pairing: the CGC-255E is designed to plug directly into the EUT power socket of a LISN via its NEMA 15-P interface for conducted emissions test setup verification.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.