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500 Series plug-in interface: Difference between revisions
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In early 500-series systems, | |||
the mainframe's triggering is based on the main vertical signal sent by the plug-in to the mainframe on | |||
pins 1 and 3. | |||
In these scopes, changing the vertical position control on the plug-in interacts with the trigger level setting if the scope is set to a | |||
DC trigger mode. | |||
In somewhat later 500-series systems, the plug-in (e.g., [[1A1|Type 1A1]]) | |||
provides the mainframe (e.g., [[547|Type 547]]) with a trigger signal on pin 5, separate from the main vertical signal. | |||
The vertical position knob on the plug-in doesn't affect the DC level on the trigger signal sent from the plug-in to the mainframe. | |||
This allows, in multi-trace setups, for the operator to consistently trigger from a specific input channel independent | |||
of which channel is currently being drawn on CRT. | |||
Although the Type 1A1 has two input channels, they are not identical. | |||
Only the channel 1 signal is sent to the mainframe on the pin 5. | |||
The 547 has two types of INT triggering, differing in whether the mainframe's trigger circuit is fed by the | |||
pin 1,3 (main vertical) output of the plug-in or the pin 5 (trigger signal) output. | |||
In even later 500-series plug-ins (e.g., the [[1A4|Type 1A4]]), | |||
the plug-in has a knob for the selection of which input channel's signal | |||
will be sent to the mainframe as the trigger signal. | |||
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