Lambda SR1, Operation Manual, Page: 59 / 317

SR1 Operation 59
© 2014 Stanford Research Systems
Amplitude Controls
The Channel Gain control varies modifies the total output amplitude for the channel from 0% to 1000%
of the sum of the waveform amplitudes for that channel. The Total Channel Amplitude control displays
that value. For instance, if the channel has 2 sine waveforms, one with an amplitude of .3 FFS, and the
second with an amplitude of .5 FFS, and if the
Channel Gain control is set to 50%, then Total
Channel Amplitude will display .4 FFS. In general the A and B channels can have separate Channel
Gains , however, if the A/B Lock checkbox is checked, the A and B values are always the same. Auto-
On affects the behavior of the generator output during a sweep . If Auto-On is checked the generator
output will automatically turn on at the beginning of a sweep (if it was turned off) and turn off when the
sweep is completed.
The large green/red On/Off buttons turn on and off their respective channels, while the Invert buttons
invert the output for each channel.
Reference Controls
The Reference controls allow setting several parameters used in the computation of different generator
amplitude units. See the Digital
Generator Units section for a complete description of all these units.
Note that there is one set of references for both generator channels.
Burst Controls
The SR1 Digital Generator implements a Timed Burst mode which switches the overall amplitude of the
combined waveform output between two different values.
Burst Mode turns the burst feature on and off.
Lo Amp selects the lo burst amplitude as a fraction of the original generator amplitude.
Burst Period controls the total hi+lo period of the burst cycle. This value may be entered in seconds or
in cycles of the current waveform.
Burst Duty Cycle controls the fraction of the burst period during which the generator output is at the hi
amplitude.