York CNE III Comparison Noise Emitter, 9 kHz - 3.5 GHz

Broadband noise generator suitable for calibration of test sites/shielded enclosures. It is a self-contained unit with replaceable dry cells. The device creates “white” noise over the spectrum. Included in the kit is the LSA-01 LISN adaptor (9kHz-30MHz); TLM-01 top loaded monopole (30MHz-1GHz) and a MON-02 (1-2GHz) monopole. From new the unit was calibrated at the Y.E.S. test site on a 10 metre range. This will enable the end user to compare their site measurement data against an approved site.

York CNE III Features

• Continuous, broadband output for Full spectrum measurements and analysis
• Stable output - Repeatable measurements
• Conducted and radiated output options - Evaluation of both conducted and radiated systems
• 9kHz to 3.5GHz output - Applications across a broad frequency spectrum
• Compact and portable - Comparisons between sites and environment
• Battery powered - No power or interconnecting cable effects on measurements

Radiated Emissions

The CNE III is a broadband noise source which provides continuous output power from 9kHz to 3.5GHz. The broadband nature of the output enables the observation of details within the spectrum which would be missed with a comb generator. For radiated operation three monopole antennas, optimised for different bands of the spectrum, are available which attach to the top of the unit. The CNE III is an ideal source for carrying out checks on open area test sites (OATS) and anechoic chambers. The CNE III is battery powered to allow operation as an electrically small source which minimises the effect of the structure of the CNE III itself when characterising the electromagnetic environment. Conversely, if desired, cables may be attached to the earth stud or the RF output to allow characterisation and investigation of the effects of changes in the wiring layout on measurements. The CNE III is housed in a metal box so that it can be mounted in direct contact with a metal ground plane as may be required by some tests. The power output level of the unit avoids the overloads possible with impulsive noise sources which may cause damage to the sensitive input circuits of receiving equipment.

Conducted emissions

In the same way that using the CNE III with an antenna can be used to check radiated measurement systems, an N-type connector provides a direct 50Ω matched output which can be used to carry out checks on conducted measurement systems. An adaptor is available (LSA02) which provides a capacitive link from the output of the CNE to a standard IEC 320 mains power connector. This allows checks and investigations on conducted measurement systems to be made, for example using a LISN or an absorbing clamp.