ISN30M Overview
The impedance stabilization network ISN 303417 is used for the measurement of conducted disturbances using a current clamp on WPT (wireless power transmission) systems. It is especially designed according to ETSI EN 303417 chapter 6.2.4. The circuit diagram is shown in Fig. 2. Fig. 3 shows the WPT setup together with the ISN. For common mode signals the ISN presents an impedance of 150 Ω (see Fig. 4). For differential signals, the impedance of the ISN (see Fig. 5) is sufficiently high in order not to bias the operation of the WPT.
EN/ETSI ISN 303417 ISN for WPT (Wireless Power Transmission) Systems:
- Frequency range (ISN): 150 kHz – 30 MHz
- Frequency range (CDN): 150 kHz – 80 MHz
- Type: T8, T4, T2-ISN, CDN (EAB8 50-150 required)
- Insertion loss: differential mode AE - EuT port: typ.: < 1 dB 100 kHz to 30 MHz typ.: < 2.5 dB 30 MHz to 250 MHz (Fig.3)
- Decoupling AE-EuT: >55 dB (Fig.4)
- Longitudinal Conversion Loss (LCL): 75 dB @ 150 kHz 59 dB @ 30 MHz (Fig.5)
- Voltage division factor for asymmetrical voltage: 10 dB ± 1 dB (Fig.6)
- Impedance (asymm.): ≤30 MHz: 150 Ω ± 20 Ω (Fig.7) >30 MHz: 150 Ω + 60 Ω/ -45 Ω≤
- Common mode phase angle: 0° ± 20° (Fig.8)
- Connectors AE, EuT: RJ-45 (8P8C)
- Current max: 800 mA (pair)
- Max. voltage: 63 VAC / 100 VDC
- Measurement port: BNC 50 Ω female
- Crosstalk PSELFEXT: typ.: > 66 dB 150 kHz – 1 MHz typ.: > 46 dB at 10 MHz typ.: > 38 dB at 30 MHz
- Weight: 465 g (1 Lbs)
- Outer dimensions W x H x D: 125 mm x 62 mm x 105 mm (5 x 2.4 x 4 inches)
- CISPR circuit diagram: CISPR 22, Appendix D, Fig. D.3
