Lambda SR1, Operation Manual, Page: 63 / 317

SR1 Operation 63
© 2014 Stanford Research Systems
a combined waveform this checkbox allows the selected waveform to be toggled on and off while still
outputting the remainder of the waveforms.
The EQ checkbox appears for only certain waveforms. If EQ is checked, and an EQ file is selected on
the generator panel, the actual generated amplitude for the waveform will be the nominal amplitude
multiplied by the frequency response of the EQ file at the current frequency.
The Waveform Amplitude control sets the peak amplitude of most waveforms in one of the digital
generator amplitude units . Because generator amplitudes refer to peak waveform values, amplitudes
cannot exceed 1 FFS regardless of waveform.
The Waveform Frequency control sets the frequency of many waveforms in one of the digital generator
frequency units . Digital generator frequencies range from 10 Hz up to Fs/2 where Fs is the current digital
output sampling rate (OSR). The current OSR is displayed at the top of the digital generator panel.
Generator Trigger
Certain generator waveforms can generate a trigger, known as a "generator trigger" which can be used
by the analyzers to synchronize the analyzer to a certain portion of the waveform. Triggering is a
complex subject (which is fully described in the
Analyzers section), and there are many different
possible analyzer trigger sources besides generator trigger. In this section the discussion of triggering
will be limited to those waveforms which provide generator triggers, and where in those waveform is the
trigger occurs. When the generator is configured with multiple waveforms, the first waveform which is
generator-trigger capable will be the source of all generator triggers.
The Digital Generator Waveforms
In the following list, waveforms that may not be combined with other waveforms are marked with an
asterisk (*) next to their names.
Sine
The sine wave is the most basic audio test waveform. Sine waveforms are specified only by their
amplitude and frequency. The Normal Sine waveform may be combined with other waveforms.