- Designed for conducted emissions measurement on two balanced pairs such as telecom lines.
- Meets Longitudinal Conversion Loss (LCL) criteria per CISPR 22 item 9.6.2.c)1).
- Provides stable impedance and reliable decoupling between EUT and auxiliary equipment.
- D-SUB 25 connectors for EUT and AE interfaces.
- 50 Ω BNC measurement port for connection to analyzers or receivers.
- Suitable for use in labs and pre-compliance environments.
TBISN-T4
Two balanced pairs ISN
The Tekbox TBISN-T4 is a specialised Impedance Stabilisation Network (ISN) designed for conducted emissions testing on balanced pair telecom lines. It is used to measure asymmetrical common-mode interference on two balanced pairs (e.g., twisted telecom cables) in accordance with CISPR 22 requirements and supports EMC pre-compliance testing with equipment like spectrum analyzers or EMI receivers.
Features
Key capabilities and advantages
Specification
Technical specifications and parameters
| Frequency Range | 150 kHz – 30 MHz |
| Impedance (asymmetric) | 150 Ω± 20 Ω |
| Phase (asymmetric) | 0° ± 20° |
| Longitudinal Conversion Loss (LCL) | CISPR 22 item 9.6.2.c)1) page 24 |
| Voltage Division Ratio (VDF) for asymmetrical voltage | 10 dB +/- 1 dB |
| EuT, AE Terminals | D-SUB 25 |
| Measuring Port | 50Ω BNC |
| Max. Voltage | 63V AC / 100V DC |
| Max. Current | 250mA |
| Insertion Loss (Differential Mode) | < 3dB |
| Decoupling AE-EuT | 150kHz to 1.5 MHz > (35dB to 55dB); > 1.5MHz ( > 55dB) |
| Outer dimensions (W x H x D) | 100 x 100 x 235 mm |
| Weight approx. | 1.0 kg |
| According to standards | CISPR 16-1-2,CISPR 22,CISPR 32 & CISPR 15 |
| Operating Temperature | +5° C to 40° |
| Relative humidity | up to 80% |
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