Impedance Stabilisation Network NTFM 8131 A, also known as T-ISN, is used to measure the asymmetrical interference voltage on symmetrical data or telecommunication lines.
Since 2002 the T-ISN is used for measurements of the asymmetrical disturbance voltage according EN 55015 (electrical lighting equipment). Furthermore it can be used for measurements according to CISPR 32.
In contrast to the widely used T-ISN the NTFM 8131 A was designed to withstand 400 V AC a maximum current of 3 A.
| Frequency Range: | (9 kHz) 150 kHz – 30 MHz |
| Impedance (asymm.): | 150 Ohm ± 20 Ohm |
| Phase (asymm.): | 0° ± 20° |
| Longitudinal Conversion Loss (LCL): | acc. CISPR 32 Table C.2 |
| Voltage Division Ratio for asymmetrical voltage: | 10 dB +/- 1.5 dB |
| EuT, AT Terminals: | 4 mm jacks, equilateral triangle, 19 mm distance |
| Measuring Port: | 50 Ohm, BNC |
| Max. Voltage: | 400 V AC |
| Max. Current: | 3 A |
| Insertion Loss: (Differential Mode): | < 3 dB (100 Ohm sym.) |
| Outer dimensions HxWxD: | 119 x 250 x 105 mm |
| Weight approx.: | 1.5kg |
| According to standards: | CISPR 16-1-2 CISPR 32 CISPR 15 |
