R&S®ENY81-CA6 Coupling Network

For disturbance and immunity measurements on telecommunications ports

  • Overview

Key facts

  • Eight-wire network
  • Disturbance measurements in line with CISPR 22:2008 and EN 55022:2010 as well as CISPR 32 and EN 55032 (150 kHz to 30 MHz)
  • Immunity measurements in line with CISPR 24 and EN 55024 (150 kHz to 80 MHz)

Brief description

The R&S®ENY81-CA6 coupling network is used for performing disturbance and immunity measurements on unshielded symmetrical telecommunications ports for cable category Cat 6.

Features

  • Immunity measurements
  • Disturbance measurements
  • Functional testing

Specifications

Frequency range
Disturbance measurements 150 kHz to 30 MHz
Immunity measurements 150 kHz to 80 MHz

Key facts

  • Eight-wire network
  • Disturbance measurements in line with CISPR 22:2008 and EN 55022:2010 as well as CISPR 32 and EN 55032 (150 kHz to 30 MHz)
  • Immunity measurements in line with CISPR 24 and EN 55024 (150 kHz to 80 MHz)
  • Compliance with CISPR 16-1-2
  • 75 dB longitudinal conversion loss (LCL)
  • High transmission bandwidth for wanted signal (250 MHz)

Brief description

The R&S®ENY81-CA6 coupling network is used for performing disturbance and immunity measurements on unshielded symmetrical telecommunications ports for cable category Cat 6.

Features & Benefits

Functional description

The R&S®ENY81-CA6 terminates the EUT interface with 150 Ω (asymmetrical or common-mode impedance) and couples the EUT's asymmetrical voltage to the test receiver with a voltage division factor of typ. 9.5 dB. The wanted symmetrical (differential-mode) signal passes through the coupling network almost without attenuation up to a bandwidth of 250 MHz (valid for a symmetrical impedance of 100 Ω). At the same time, the coupling network decouples the test circuit from disturbance effects (disturbance voltage, impedance) at the AE port.

Mechanical design

The R&S®ENY81-CA6 coupling network features bare threaded sockets for connecting it to a reference ground plane that is arranged either horizontally or vertically.

Disturbance measurements

With four unshielded symmetrical wire pairs, an eight-wire ISN (R&S®ENY81 or R&S®ENY81-CA6) is needed. However, the design of the R&S®ENY81-CA6 also permits measurements on one or two wire pairs.

CISPR 22 and EN 55022 as well as CISPR 32 and EN 55032 specify the following conformance test method: The EUT is to be measured with a suppression of the wanted symmetrical signal corresponding to the category of the connected cable (requirements for cable categories Cat 3, Cat 5, and Cat 6 are defined in the standard). In order to implement these test methods, the R&S®ENY81-CA6 consists of a high-symmetry basic network with a longitudinal conversion loss of 75 dB for cable category Cat 6. The LCL is internally implemented at the EUT end. For cable categories Cat 3 and Cat 5, the R&S®ENY81 eight-wire coupling network is to be used.

Immunity measurements

For immunity measurements, a 150 Ω to 50 Ω adapter (100 Ω series resistor in line with IEC 61000-4-6) is required in order to calibrate the test system. This series or terminating resistor as well as various adapters for connecting the ISN are included in the R&S®ENY-ITS immunity test set, which is available as an option.

Functional testing

A functional test of the ISN can be performed by means of the R&S®ENY-FTS option and a network analyzer. The functional test includes verification of the asymmetrical impedance and phase, the voltage division factor, the longitudinal conversion loss and the decoupling attenuation.

Specifications

Specifications
Frequency range
Disturbance measurements   150 kHz to 30 MHz
Immunity measurements   150 kHz to 80 MHz
Asymmetrical impedance
Impedance 0.15 MHz to 30 MHz 150 Ω ± 20 Ω
  >30 MHz to 80 MHz 150 Ω ± 40 Ω
Phase angle 0.15 MHz to 30 MHz 0° ± 20°
Voltage division factor in asymmetrical circuit
150 kHz to 30 MHz calibration data supplied 1) typ. 9.5 dB ± 1 dB
>30 MHz to 80 MHz   typ. 9.5 dB ± 2 dB
Transmission bandwidth (3 dB) for 100 Ω source and
load impedance
>250 MHz
Longitudinal conversion loss (LCL)
LCL   75 – 10 log (1+(f/5)2) dB
Tolerance for f < 2 MHz ±3 dB
  for 2 MHz ≤ f ≤30 MHz –3 dB/+6 dB
Decoupling attenuation
150 kHz to 1.5 MHz linear increase with logarithmic frequency >35 dB to 55  dB
1.5 MHz to 30 MHz   >55 dB
Crosstalk (PSELFEXT, EUT/AE)
1 MHz to 250 MHz linear decrease with logarithmic frequency ≥61 dB to ≥15 dB
Power-handling capacity
Max. permissible RF input voltage   15 V
Max. permissible DC voltage between line and ground   100 V
Max. permissible AC voltage between line and ground   63 V
Max. permissible DC current forward and reverse current on one wire pair or multiple wire pairs 600 mA
Connectors
Output to test receiver/input from signal generator   BNC female
Connectors for EUT and AE   RJ-45 female
General data
Operating temperature range   +5 °C to +40 °C
Storage temperature range   –20 °C to +70 °C
Dimensions, base unit overall dimensions, W × H × D 105 mm × 65 mm × 110 mm
 
Weight
  Base unit   500 g
  Carrying case with base unit   1900 g

1) The calibration data includes asymmetrical impedance and phase, voltage division factor, decoupling attenuation, longitudinal conversion loss (LCL), transmission bandwidth and crosstalk.

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