The NM37/57 RFI Receiver is an EMI field intensity meter that measures both conducted and radiated RF interference to MIL-STD-461/462 as well as other commercial standards. This receiver has an internal calibration source , an X-Y output and provides readings in average, quasi-peak, direct peak and slideback detection. It is fully solid-state and portable. Frequency range is 30MHz to 1GHz in 8 bands with an input impedance of 50-ohms. Overall measurement range is 140 dB (0.1 ?V to 1.0 V). It can be operated on 120 VAC or 230 VAC (50 to 400Hz) or its self-contained rechargeable NiCad batteries.