Telephone EMI filter FZT-2 is designed for protection of data circulating in landline communication networks from leakage due to secondary electromagnetic interference.
– rated voltage 48 V DC – operating voltage from 0 to 242 V AC from 45 to 55 Hz or from 0 to 352 V DC
voltage rated current:
1 mA DC
voltage peak current:
150 mA DC
voltage drop on the filter at current 150 mA, not more:
1 V
insertion loss of filter without operating current, symmetric measurement scheme:
a) at 300 to 600 Hz and from 3 to 3,5 kHz – not more than ±2 dB
b) at 600 Hz to 3 kHz — not more than ± 0,5 dB
c) at 5 to 10 kHz, not less — increases from 10 to 30 dB
d) at 0,01 to 30 MHz, not less — increases from 30 до 80 dB
insertion loss of filter without operating current, asymmetric measurement scheme, not less:
a) at 10 to 100 kHz — increases from 10 to 50 dB
b) at 100 kHz to 1000 MHz – increases from 50 to 70 dB
Diagram of filter insertion loss — see Diagrams.
coupling loss of signals between filters situated nearby, ion range from 300 Hz to 3,5 kHz, not less:
75 dB
electric capacity of every filter in relation to the case, not more:
75 nF
impendance balance coefficient of filter channels in relation to the case, with operating current flow and influence of rated voltage, not less:
a) at 300 to 600 Hz and from 3,4 to 3,5 kHz — 40 dB
