NTFM8158 communication terminal impedance stabilization network (150k-30M)-Century Wisdom (Suzhou) Testing Technology Co., Ltd

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NTFM8158 communication terminal impedance stabilization network (150k-30M)

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SCHWARZBECK

NTFM8158 communication terminal impedance stabilization network (150k-30M)

Product Description
Main features
Technical parameters

- Commodity name: NTFM8158 communication terminal impedance stabilization network (150k-30M)
- Commodity ID: 1064726655256907776
- 品牌11: SCHWARZBECK
- 描述: Used to measure the disturbance voltage of unshielded twisted pair (UTP) or communication ports with 2/4/6/8 wires according to CISPR 22:2005 or EN 55022:2006.
- 品牌: SCHWARZBECK
Application notes :

The telecommunication port of the device under test must be connected to the NTFM 8158 EUT port. NTFM 8158 provides asymmetric port termination of the EUT. Auxiliary equipment (AE) that must operate with the device under test must be connected to the AE port of the NTFM 8158.

Data communication is based on differential-mode voltages on paired wires. If the virtual zero point in the middle of the voltage is displaced compared with the reference ground, the magnitude of the displacement is called asymmetrical interference voltage or common mode voltage. This voltage is detached from the BNC connector to be measured with the receiver . The nominal divider factor is 9.5 dB, i.e. the voltage reading at the 50Ω receiver must be increased by 9.5 dB. This generates interference voltages.

LCL describes the conversion of a desired differential-mode data signal to an unwanted common-mode signal along a transmission line. Common mode signals may be radiated and may cause disturbing field strengths.

CISPR 22 describes the test setup in more detail. Particular attention must be paid to low inductive grounding, i.e. grounding suitable for radio frequencies. This is accomplished by placing the aluminum housing of the NTFM 8158 directly on the reference ground plane. The EUT cables and auxiliary equipment cables shall not be installed close together or in parallel to avoid unnecessary coupling between them.
main feature:

ISN NTFM 8158 is used to measure the disturbance voltage of unshielded twisted pair (UTP) or communication ports with 2/4/6/8 wires according to CISPR 22:2005 or EN 55022:2006. The equipment under test (EUT) or auxiliary equipment (AE) can be connected using RJ-45 connectors, and the pin definitions conform to EIA/TIA-T568A/B. The circuit design basis of NTFM 8158 is CISPR 22 version 5.2 Figure D.3.

The longitudinal conversion loss provided by NTFM 8158 is typically 75dB on the EUT side, allowing direct measurement of CAT6 equipment.

NTFM 8158 can be used not only for the measurement of disturbance voltage, but also for the measurement of conducted immunity according to CISPR 24 or EN 55024. At this time, a 50Ω to 150Ω impedance adapter conforming to the IEC61000-4-6 standard is required as an option. This adapter can also be easily installed to NTFM 8158.

The technical specifications of NTFM 8158 are fully compliant with CISPR 22 version 5.2 and calibrated in accordance with the method described in CISPR 16-1-2 Annex E.

Frequency Range	150 kHz - 30 MHz（ISN） 150 kHz - 80 MHz（CDN）
type	T8, T4, T2-ISN, CDN
Typical Insertion Loss (differential mode AE-EUT port)	< 1dB（100kHz－30MHz） < 2.5dB (30MHz-250MHz), see Figure 1
Decoupling (AE-EUT)	>55 dB, see Figure 2
Longitudinal Conversion Loss (LCL)	75dB@150kHz 59dB@30MHz, see Figure 3
Divider factor (asymmetrical voltage)	9.5 dB ± 1 dB, see Figure 4
Maximum RF Voltage - EUT	15 V
Maximum RF Voltage - Measurement Port BNC	25 V
Impedance (asymmetrical)	150Ω ± 20Ω (≤30 MHz), see Figure 5 150 Ω + 60 Ω/ -45 Ω ，>30 MHz
Common mode phase angle	0° ± 20°
Connectors (AE, EUT)	RJ-45 (8P8C)
Measurement port	BNC(female) 50Ω
Crosstalk PSELFEXT Typical	>66dB（150kHz-1MHz） >46dB（10MHz） >38dB（30MHz）
CISPR circuit diagram	CISPR 22 Annex D Figure D.3
weight	465g
Dimensions (WxHxD)	125 mm x 62 mm x 105 mm