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The Tektronix Type 109 is a pulse generator using a  
The Tektronix Type 109 is a pulse generator [[introduced in 1962]].
[[Connectors#GR-874|GR-874]] 50-ohm output connector and has a  
It uses a [[Connectors#GR-874|GR-874]] 50-ohm output connector  
specified rise time of 250ps. Pulse width can be  
and has a specified rise time of 250ps.  
programmed with a external 50 Ohm cable through  
Pulse width can be programmed with a external 50 Ohm cable  
two GR-874 50-ohm connectors.  The maximum allowed impulse width is 50nS.  
through two GR-874 50-ohm connectors.   
The maximum allowed impulse width is 50nS.  
The internal voltage source is adjustable from 0V to 50V.   
The internal voltage source is adjustable from 0V to 50V.   
Using an external voltage source, pulses up to 300V are possible.
Using an external voltage source, pulses up to 300V are possible.