Introduction：
The NTFM 8158 is an ISN Impedance Stabilization Network for CAT6 cable manufactured by Schwarzbeck, Germany and authorized for sale by EUTTEST, Shenzhen, China. Required by CISPR 22:2005 or CISPR32, the ISN NTFM 8158 allows for the measurement of common-mode interference voltages on unprotected twisted-pair UTPs or communication ports with 2, 4, 6, or 8 wires. Performs common-mode interference voltage measurements. The device under test, the EuT, or the auxiliary equipment, the AE, can be connected using an RJ-45 network cable jack. Pin assignments follow EIA/TIA-T568A/B. The circuit principle of the NTFM 8158 is designed according to Figure D.3 of CISPR 22 Edition 5.2 and does not affect the transmission quality up to Gigabit Ethernet.
Technical data of the NTFM 8158:
| Equipment Model | NTFM 8158 |
| Device name | Impedance stabilized network with 8 wires |
| Meet the standard | CISPR22 CISPR32 |
| manufacturer | Schwarzbeck |
| agent | EUTTEST |
| ISN frequency | 150kHz-30MHz |
| CDN frequency | 150kHz-80MHz |
| Equipment type | T8, T4, T2-ISN, CDN (EAB8 50-150 required) |
| AE-EUT port insertion loss | typ.: < 1 dB 100 kHz to 30 MHz typ.: < 2.5 dB 30 MHz to 250 MHz |
| AE-EUT decoupling | >55dB |
| agent | Euttest.com |
| LCL longitudinal conversion loss | 75 dB @ 150 kHz 59 dB @ 30 MHz (Fig.5) |
| partial pressure coefficient | 10 dB ± 1 dB |
| impedance | ≤30 MHz: 150 Ω ± 20 Ω (Fig.7) >30 MHz: 150 Ω + 60 Ω / -45 Ω ≤ |
| common-mode phase angle | 0˚ ± 20˚ |
| connector | RJ-45 |
| Maximum current | 800mA per pair of wires |
| Maximum voltage | 63 VAC / 100 VDC |
| RF port | BNC |
| weight | 465g |
| WHD | 125mm*62mm*105mm |
Technical data charts:
LCL Longitudinal Conversion Loss Curve for NTFM 8158
Pressure Separation Factor Graph for NTFM 8158
Common Mode Impedance Curve for NTFM 8158
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