Impedance stabilization networks (ISN, or with CISPR 16-1-2 called AAN: asymmetric artificial network or AN: artificial networks for coaxial and other screened cables) are defined for measuring of conducted common mode disturbances at information technology equipment (ITE) as required in CISPR 22. The ISN is placed between the equipment under test (EUT) and auxiliary equipment (AE) or load which are necessary for the operation of the EUT. The ISN establishes the common-mode termination impedance for the EUT’s telecommunications port during measurement. ISN S501A, ISN S502A, ISN S751 and ISN S752 are designed for measurements on coaxial telecommunication lines. The used internal cable has a impedance of 50 Ω for ISN S501A and ISN S502A or 75 Ω for ISN S751 and ISN S752. The cable screen is connected on the AE side to the ground. ISN S502A and ISN S752 are supplied with double screened coaxial cables and N connector. A design example is given in figure D.9 CISPR 22 (EN 55022) and figure G.9 CISPR 32 (EN 55032).
阻抗穩定網路(ISN),在 CISPR 16-1-2 中亦稱為 AAN(非對稱人工網路) 或 AN(適用於同軸及其他屏蔽電纜的人工網路),專為測量資訊技術設備(ITE)依據 CISPR 22 規範的傳導共模干擾而設計。
ISN 置於受測設備(EUT)與輔助設備(AE)或負載之間,確保測試期間 EUT 的電信端口具有適當的共模終端阻抗。
該系列設備適用於同軸電纜通訊設備的傳導共模干擾測試,確保測試結果符合國際標準規範。
ISN S 系列特點
技術參數:
頻率範圍: 150 kHz ~ 230 MHz
線路參數: 同軸, 50 Ω 阻抗
額定功率 (EUT, AE 埠)
最大交流電壓: 250 V
最大直流電壓: 250 V
最大電流: 250 mA
測試電壓: 500 VDC, 2 sec
共模阻抗 (EUT 埠)
150 kHz ~ 30 MHz: 150 Ω ±20 Ω
30 MHz ~ 230 MHz: 150 Ω +60 Ω /-45 Ω
相位角 (EUT ~) 150 kHz ~ 30 MHz: 0° ±20°
耦合路徑 (In/Out-port/EUT)
2012-02-16: BNC 50 Ω
RF 電壓: <20 V
分壓係數Voltage division factor (RF 輸入EUT 埠)
150 kHz ~ 30 MHz: 9.5 dB ±1 dB
30 MHz ~ 230 MHz: 9.5 dB +4 dB /-2 dB
傳輸頻寬 (有用信號) EUT/AE B3 dB: > 2 GHz sin.
共模干擾抑制 (EUT / AE)
150 kHz ~ 1.5 MHz: ≥60 dB
1.5 MHz ~ 30 MHz: ≥60 dB