Overview
Filters for power supply lines are measured according to CISPR 17, annex C (respectively DIN EN 55017, annex C).
Two wideband transformers are required to transform the typical impedance of measurement devices from 50 ? to 0.1 ? or from 50 ? to 100 ? respectively.
The 0.1 ? transformer (voltage division ratio 22:1) has to be connected to the 50 ? generator. The 100 ? transformer (voltage division ratio 1.4:1) has to be connected to a 50 ? receiver. The schematic below shows how to set up the measurement.
IMPORTANT! Do NOT connect the transformers to any kind of power supply, neither A.C. nor D.C.
| Specifications | ||
| Model | SY 9223-17-0.1 | SY 9223-17-100 |
| Nominal frequency range | 1 kHz – 300 kHz | 1 kHz – 300 kHz |
| Return loss | min. 15 dB | min. 15 dB |
| Max. power dissipation | 500 mW | 500 mW |
| Impedance transformation | 50 ? : 0.1 ? | 100 ? : 50 ? |
| Dimensions incl. connectors | L= 105 mm, H= 43 mm, B= 40 mm | L= 105 mm, H= 43 mm, B= 40 mm |
| Weight | max. 300 g | max. 250 g |
| Connector 50 ? side | 50 ? BNC Buchse/female | 50 ? BNC Buchse/female |
| Connector 100 ? side | 4 mm Buchsen/4 mm female | 4 mm Buchsen/4 mm connector |
Transmission of the two transformers measured in the 50? System (back to back)
