The industry standard reference noise source offering continuous radiated and conducted outputs up to 2GHz.
The CNE III is a broadband noise source which provides continuous output power from 9kHz to 2GHz. 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.
In the same way that using the CNE III with an antenna can be used to check radiated measurement systems, a BNC 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.
| Specifications | |
|---|---|
| Frequency Range | 9kHz to 2GHz direct connection into a 50Ω system |
| 30MHz to 2GHz radiated using TLM01, TLM02, MON01 antennas | |
| Output connector | 50Ω BNC socket |
| Temperature stability 15°C to 35°C |
<1dB up to 1.5GHz |
| <2dB up to 2GHz | |
| Time stability | Typically <1dB over a 12 month period |
| Power off timer | Continuous operation or variable between 15 and 135 minutes in 15-minute steps. |
| Dimensions | 206mm × 120mm × 80mm (excluding antenna) |
| Weight | 1.3kg (excluding battery) |
| Power supply | 4 × C-type cells. Alkaline or rechargeable |
| Operating time | 12 hours typical with alkaline cells |
| Indicators | Power on - green LED |
| Part Number | Description | Parts Included |
|---|---|---|
CNEIIIKIT01
 |
Standard CNE III comparison continuous noise emitter kit with antenna and LISN adaptor |
|
CNEIIIKIT02
 |
Enhanced CNE III comparison continuous noise emitter kit with multiple antennas and LISN adaptor |
|
| Accessory | Part Nº | Description |
|---|---|---|
| Antenna | TLM01 | 200MHz to 1GHz (optimum) 100mm long top-loaded monopole |
| TLM02 | 30MHz to 300MHz (optimum) 290mm long top-loaded monopole | |
| MON01 | 1GHz to 2GHz (optimum) 37mm long monopole | |
| Direct coupler | LSA02 | LISN adapter with IEC-style connection |
| Type | Order Nº | Description |
|---|---|---|
| Direct Output | CAL01 | 9kHz to 2GHz power measurement using spectrum analyser |
| Radiated Output | CAL02 | 30MHz to 1GHz horizontal and vertical polarisation electric field-strength on OATS using receiver, either 3m or 10m |
| CAL06 | 30MHz to 1GHz horizontal and vertical polarisation electric field-strength in FAR using a spectrum analyser at 3m |
Further details can be obtained from:
York EMC Services LtdLast updated: 2006-Oct-31
