The Comparison Noise Emitter III - York EMC Services Ltd

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CNE III, a General Purpose Broadband Noise Reference Source Providing Continuous Output from 9 kHz to 3.5 GHz

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The Comparison Noise Emitter III

This product has been discontinued. Please see the CNE VI, CNE V+ or CNE V for an alternative.

The Comparison Noise Emitter III (CNE III) is a broadband noise source providing a continuous output from 9kHz to 3.5GHz. The stable output allows the CNE III to be used as a general-purpose reference source for characterizing and verifying both conducted and radiated test environments. The CNE III has become an accepted industry reference ‘standard’ since its introduction in 1988.

The broadband nature of the output enables the observation of details within the spectrum that would be missed when using a comb generator, whilst the power output level of the unit avoids the overloads possible with impulsive noise sources that may cause damage to the sensitive input circuits of receiving equipment.

The CNE III is supplied with a 50 Ω N-type output connector for direct connection to conducted measurement systems. An IEC 320 adapter is also available to provide a connection to LISN equipment, as well as an RJ11/RJ14/RJ25/RJ45 adapter for connection to telecoms ISNs.

The CNE III can also be connected to an antenna, to generate reference fields for use with radiated emissions test environments such as Open Area Test Sites and anechoic chambers. A selection of antennas that connect directly to the CNEIII for this purpose is available. The CNE III is compact and battery powered to allow operation as an electrically small source, thereby minimising the effect of the structure of the CNE III itself when used as a radiating reference. Conversely, cables may be attached to the enclosure earth stud and/or the signal output to investigate and characterise any measurement effects caused by changes in the wiring layout.
 

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THIS PRODUCT HAS BEEN DISCONTINUED Please see the CNE VI, CNE V+ or CNE V for an alternative.

Features

Continuous, broadband output •  Full spectrum measurements and analysis
Stable output •  Repeatable measurements
Conducted and radiated options •  Evaluation of both conducted and radiated systems
9 kHz to 3.5 GHz output •  Applications across a broad frequency spectrum
Compact and portable •  Comparisons between sites and environments
Battery powered •  No power or interconnecting cables affecting measurements
Auto-off timer •  Adjustable shutdown period to save battery power

Applications

  • Radiated and conducted measurement systems validation and verfication
  • Radiated measurement systems validation and verification
  • Reference source for:
    • Daily pre-test verification checks if required by the accreditation authorities e.g. ISO 17025
    • Long-term performance monitoring
    • Spectrum analyser / receiver pre-checks
    • Cable position investigation
  • Investigation and characterisation of screened room/anechoic room/OATS behaviour
  • Comparisons between different measurement environments e.g. OATS or anechoic chambers
  • Characterisation of filter performance
  • Cable loss measurements

THIS PRODUCT HAS BEEN DISCONTINUED Please see the CNE VI, CNE V+ or CNE V for an alternative.

Specifications

 
Frequency Range •  9 kHz to 3.5 GHz (usable to 5 GHz) into a 50 Ω system
  •  30 MHz to 3.5 GHz radiated (using TLM01, TLM02, MCN01 antennas)
Output connector •  50 Ω N-type socket
Temperature stability  •  (15 °C to 30 °C) 500 kHz to 3.5 GHz, <±1 dB
  •  (5 °C to 40 °C)  9 kHz to 5 GHz, <±2 dB
Time stability •  Typically <1 dB over a 12 month period
Power off timer •  Always-on operation or variable between 15 and 135 minutes (15 min steps)
Dimensions •  206 mm × 120 mm x 63 mm (80 mm inc. connector) (excluding antenna)
Weight •  Approx 1.3 kg (including battery)
Power supply •  2 x C-cells. Alkaline or rechargeable
Operating Time • 12 hours typical with alkaline cells
Indicators •  Power on - green LED
  •  Timeout, low battery - red LED

 

THIS PRODUCT HAS BEEN DISCONTINUED Please see the CNE VI, CNE V+ or CNE V for an alternative.

Standard Kits:

Part Number

Description

Parts included

CNEIIIKIT01 Standard CNE III comparison continuous   CNE III noise source
  noise emitter kit •  TLM01 - 200 MHz to 1GHz (optimum) 100 mm 
      long top-loaded monopole antenna
    LSA03 - LISN adapter with IEC-style 
      connection
       
CNEIIIKIT02 Enhanced CNE III comparison continuous CNE III noise source
  noise emitter kit TLM01 - 200 MHz to 1 GHz (optimum) 100 mm 
      top-loaded monopole antenna 
    TLM02 - 30 MHz to 300 MHz (optimum) 290 mm 
      top-loaded monopole antenna
    MCN01 – 1 GHz+ (optimum) detachable
      monocone antenna
    LSA03 - LISN adapter with IEC 320 style 
      connection
       

All kits are supplied with:

  • Alkaline batteries
  • N-type adapters
  • Hard case
  • CAL01 - 0 to 5 GHz output power measurement using spectrum analyser

Accessories

TLM01 200 MHz to 1 GHz (optimum) 100 mm top-loaded monopole antenna
TLM02 30 MHz to 300 MHz (optimum) 270 mm top-loaded monopole antenna
MCN01 1 GHz+ (optimum) monocone antenna
LSA03 LISN adapter with IEC 320 style connection
NIA01 ISN adapter with RJ11/RJ14/RJ25/RJ45 style connection

 

THIS PRODUCT HAS BEEN DISCONTINUED Please see the CNE VI, CNE V+ or CNE V for an alternative.

Manufacturer's calibrations

CAL01        Direct output power
  0 to 5 GHz power measurement using spectrum analysers
CAL02 Radiated field strength, OATS
  30 MHz to 1 GHz horizontal and vertical polarisation electric  field-strength on OATS 
  using receiver, either 3 m or 10 m
CAL04 Radiated field strength, OATS
  30 MHz to 1 GHz horizontal and vertical polarisation electric field-strength on OATS 
  using receiver, either 3 m and 10 m
CAL06 Radiated field strength, FAR
  30 MHz to 1 GHz horizontal and vertical polarisation electric field-strength in FAR using 
  a spectrum analyser or receiver at 3 m 

Typical Output Measurement Results

View all Output Measurements here (PDF)