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SR1 Operation Manual 96
© 2014 Stanford Research Systems
Configuring Switcher Sweeps
SR1 is designed to work with the SR10, SR11, and SR12 Audio Switchers to allow users to switch both
outputs from and inputs to SR1 during a sweep to enable testing of multiple devices. Configuration of a
switch network, including identification of the physical switch boxes and specification of communication
protocols, is performed on the
Switcher Configuration Panel . After configuring the details of the switcher
network each input and output is assigned a logical channel number . For purposes of discussing the
switcher sweep all we need to know is the range of logical channel numbers for both the inputs and
outputs; the details of the switcher network configuration will be left to the discussion of the Switcher
Configuration Panel.
Switcher sweeps can only be configured on the outer sweep axis. The typical measurement
configuration will be to first sweep the input or output to a particular device (outer axis) and then perform
the sweep which represents the actual measurement being performed on the inner axis. To select a
switcher sweep double click on the "Switcher" node in the sweep source selection for the outer sweep
axis. This displays the switcher sweep source panel:
There are two tabs on the switcher sweep source panel, one for inputs and one for outputs. Inputs and
outputs can be swept simultaneously if the corresponding switcher hardware has been configured on
the
Switcher Configuration Panel . On each tab the network selection determines whether unbalanced
(BNC) or balanced (XLR) inputs or outputs will be swept. The number of steps determines how many
points will be taken. (The number of points is the number of steps plus one, i.e. a sweep of one step
contains two points, the initial and final ones.) On both the input and output tabs the checkboxes for A
and B determine whether the A channel, B channel, or both will be swept. If the checkbox is checked
then the corresponding up-down control will be enabled allowing setting of the initial logical channel for
each channel. At each step in the sweep the logical channel connected to each checked input or output
will be incremented by the amount specified by the "in steps of " control.
For example, consider the output sweep specified by the panel illustrated above. At each point in the
sweep the logical channel connections to the A and B outputs will be:
Sweep Point
0 (Initial
State)
1 2 3 4
5 (Final
State)
A Logical
Channel
1 3 5 7 9 11
B Logical
Channel
2 4 6 8 10 12
This represents a typical stereo sweep of a single switcher with 12 channels. If a single channel sweep
were desired the "B" sweep could be unchecked and the channel increment reduced to one thereby
enabling up to 11 sweep steps on a single device. Adding more devices in the Switcher Configuration
Panel will increase the available range of logical channel numbers and increase the number of possible
steps in the sweep.
When the "Bus" box is checked (output switcher sweeps only), all the output channels are
simultaneously connected to SR1's output
except the one channel that is being sweep. This is useful for
testing crosstalk of multiple devices.