Lambda SR1 Operation Manual page 48

48 SR1 Operation Manual
USASI Noise*
USASI noise is a special type of filtered noise designed to mimic the content of audio program material.
USASI noise is typically used in testing broadcast transmitters to measure compliance with
transmission bandwidth requirements. Because the frequency content of USASI noise is fixed, only an
amplitude control appears on the waveform tab. USASI noise may be used in conjunction with generator
bursting to generate a burst USASI signal suitable for transmitter testing.
Frequency Spectrum of USASI Noise: 100 Hz 6dB/oct hipass + 320 Hz 6 dB/oct lopass
Square Wave*
SR1 square waves uses special hardware to generate clean analog square waves. As a result, square
waves may not be combined with other waveforms in the analog generator. The square wave frequency is
limited to a maximum of 50 kHz regardless of the selected analog generator sampling rate. Because of
the finite bandwidth of the analog generator, square waves will have finite risetime and overshoot
depending on the frequency and the selected D/A converter.
© 2014 Stanford Research Systems