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SR1 Operation Manual 40
© 2014 Stanford Research Systems
generator output will automatically turn on (if it was off) at the beginning of a sweep 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 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 Analog Generator implements two different types of burst functionality. Synchronous Burst
provides a burst sine wave with a variety of triggering options where the burst transitions are guaranteed
to be synchronous with the zero crossings of the sine wave. This type of burst is implemented in SR1 as
a separate waveform. SR1 also offers the capability of bursting
any waveform that can be configured in
the generator, although with no guarantee that bursting will occur at zero-crossings. This type of burst
will be referred to as "generator burst" as opposed to synchronous burst.
Generator Burst Mode selects the burst triggering mode
Timed The waveform outputs at the high amplitude then the low amplitude and repeats. The
total period is determined by the Burst Period control. The high-amplitude fraction of the
period is determined by the Burst Duty Cycle.
Gated (hi) The waveform amplitude is determined by the TTL gating signal applied to the rear-
panel TTL burst trigger input. When the external signal is high the generator output is at
the high amplitude, when the external signal is lo the generator runs at the lo
amplitude. Burst Period and Burst Duty Cycle are ignored.
Gated (lo) The waveform amplitude is determined by the TTL gating signal applied to the rear-
panel TTL burst trigger input. When the external signal is lo the generator output is at
the high amplitude, when the external signal is high the generator runs at the lo
amplitude. Burst Period and Burst Duty Cycle are ignored.
Shaped Similar to Timed Burst except that a cosine-squared window is applied to the signal
through the "hi" portion of the burst.
Triggered The output is zero until a TTL rising edge is detected at the rear panel burst trigger
input. The output then goes high for the interval specified by Burst Period .
Lo Amp selects the lo burst amplitude as a fraction of the original generator amplitude. For Triggered