Telecom Power Filters
Applications
These filters are currently used in telephone switching systems. They are capable of meeting the safety requirements of UL1950, EN60950, IEC950, and have been certified to these specifications and installed in customer equipment being used in the U.S, Asia and Europe.
General Specifications
- USE TO MEET VDE0871 LEVEL "A" OR "B"
- MAY BE USED DIRECTLY ON THE 48VDC POWERLINE
- 100VDC INPUT RATING
- AVAILABLE WITH 1, 2, OR 3 PAIRS OF FILTER CIRCUITS
- UP TO 30 AMP CONTINUOUS RATING PER FILTER CIRCUIT
- MTBF > 1,000,000 HOURS
- BROAD FREQUENCY RANGE .1 KHZ THRU 300 MHZ
- ATTENUATION CHARACTERISTICS CUSTOMIZED FOR SPECIAL APPLICATIONS
| SERIES | CURRENT RATINGS | FILTER CKT PAIRS |
| 2FR | 10, 20, 30 AMPS | 1 |
| 4FR | 10, 20, 30 AMPS | 2 |
| 6FR | 10, 20, 30 AMPS | 3 |
Case Configuration
EMI Filter Selection
- Determine whether System 1, looking into the filter is of high or low impedance at the frequency of interest. Choose the filter with the opposite (inverse) impedance: i.e., if the system is high impedance, the filter should be low impedance; if the system is low impedance, the filter should be high impedance.
- Do the same for the opposite side of the filter (System 2).
See the Chart Above
- Power lines should be considered low impedance.
- When performing EMC testing such as in MIL-STD-461, a 10µf capacitor is specified in the line, a low impedance, therefore, a filter of high impedance should be used, such as and "L" (with the inductor toward the 10µf capacitor) or a "T".
Insersion loss data is normally provided in a 50 Ohm system. TSE has the computer capability to design to your real impedances and convert to a 50 Ohm systme for your QA testing.