RTA Series II Real Time Audio Analyzer

The DOD Electronics RTA Series II is a window-type RTA. It covers the audible frequency spectrum (20 Hz to 20 kHz), and has a five LED level meter for each of the 31 audio frequency bands that it covers.
The sensitivity of the RTA can be modified using the input level control, and the window of the RTA may be widened or narrowed using the Resolution switch. This switch allows you to choose the LED display range in dB per LED. You can choose either a 1 dB per LED step (for a 4 dB wide window...