Measurement Testing

Mjr · Site Admin Joined: 13 Jul 2005 Posts: 294

York EMC Services, Ltd. offers sophisticated broadband continuous spectrum radiated noise source tools called a CNEs (Comparison Noise Emitters).

The Comparison Noise Emitter (CNE) was developed by the University of York as a research tool for the evaluation of screened room resonances. In recent years the advance in electronic equipment, particularly in the mobile and low power communications industry, has resulted in the use of frequencies well above the current EMC test standard of 30MHz to 1GHz. As a result CNE VII (image below) has been developed in response to the requirement to verify test facilities above 1GHz.

CNE VII package consists of:

* 1.5GHz-7GHz CNE VII
* BPK01 Battery Pack
* BCH03 Battery Charger

The CNE VII is a broadband continuous spectrum radiated noise source with a useable output from 1.5 to beyond 7GHz. The CNE can be used as a source for carrying out checks in GTEM Cells and anechoic chambers. The broadband nature of the output enables the observation of details that would be missed with a comb generator.

The unit is battery powered so that it can be operated as an independent source without the effect of cables, which would modify the fields generated. An LED indicates when the battery power is low. The battery pack is easily removed and replaced to minimise the potential downtime. The CNE is housed in a plated metal cylindrical enclosure, thus ensuring uniformity of the field and can be orientated to give vertical or horizontal polarization.

Applications:

* Comparison between different measurement environments such as GTEM cells or anechoic chambers
* As a reference source for radiated measurement systems
* Daily pre-test checks
* Long term performance monitoring
* Investigation of measurement system

Specs:

* Frequency range: 1.5 to 7.0 GHz
* Power source: Sealed lead rechargeable battery pack
* Power source connector: Miniature power jack
* Battery life: approx. 7 hours
* Size:
- Diameter: 150mm
- Height: 150mm
* Finish: Nickel plated steel
* Weight: 4kg

York's Comparison Noise Emitter III is a broadband noise source with a usable output power from 9kHz to 2GHz. Three monopole antennas are available which may be attached to the BNC connector on the top of the unit enabling it to act as a radiating field source.

The CNE can be used as a source for carrying out checks on open area test sites (OATS) and anechoic chambers. The broadband nature of the output enables the observation of details which would be missed with a comb generator. The power output of the unit also avoids the overloads possible with impulsive noise sources which may cause damage to the sensitive input circuits of receiving equipment.

The unit is battery powered so that it can be operated as a small source without the effect of cables which would modify the fields generated. Alternatively cables can be connected to the output or the earth stud on one side of the unit, to investigate the effect of cables and cable positioning on measurements. The CNE is housed in a plated metal box so that it can be mounted in direct contact with a metal ground plane if desired.

The batteries are easily removed and replaced to minimise the potential down time.

An adaptor is available 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 measurements to be made (e.g. LISN, absorbing clamp).

The microprocessor control allows the operating time of the unit to be adjusted from a minimum period of 15 minutes to continuous operation. The unit will turn off automatically if the batteries are low.

Specs:

* Frequency range: 9kHz to 2GHz
* Power Source: 4 C cells (1.2 - 1.5V nominal per cell)
* Battery Life: approx. 4-5 hours continuous with Ni-Cd cells, up to 12 hours with alkaline cells
* Timer: 15 min to 135 min in 15 min steps or continuous operation
* Size: 206mm × 120mm
* Height: 62mm (including BNC connector)
* Finish: Chrome plated steel
* Weight: 1.3kg

Applications:

* Comparison between different measurement environments such as GTEM Cells or Anechoic Chambers
* As a reference source for radiated measurement systems
* Daily pre-test checks
* Long term performance monitoring
* Investigation of measurement system

For more info, contact

http://www.yorkemc.co.uk/

Tel: +44 (0)1904 434440
Fax: +44(0)1904 434434
E-mail: enquiry@yorkemc.co.uk

York EMC Services Ltd
University of York
Heslington
York
YO10 5DD
United Kingdom