The Electro-Metrics EM-7507, EM-7508 and EM-7509 Notch Rejection Filters enhance the performance of any 50 ohm measuring instrument by eliminating the 50 Hz, 60 Hz and 400 Hz power line frequencies.

The EM-7507 eliminates 50 Hz frequencies, the EM-7508 eliminates 60 Hz frequencies, while the EM-7509 eliminates 400 Hz frequencies. This prevents spurious responses frequently encountered in field intensity meters when testing to MIL-STD- 461 plus other government, federal, and international standards.

Note: EM-7507, EM-7508 and EM-7509 Notch Rejection Filters may be purchased separately.