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[[File:109 front.jpg| | [[File:109 front crop.jpg|250px|thumb|right]] | ||
The '''Tektronix Type 109''' is a pulse generator [[introduced in 1962]]. | The '''Tektronix Type 109''' is a pulse generator [[introduced in 1962]]. | ||
It uses a [[Connectors#GR-874|GR-874]] 50 Ω output connector | It uses a [[Connectors#GR-874|GR-874]] 50 Ω output connector | ||
and has a specified rise time of 250 ps. | and has a specified rise time of 250 ps. | ||
{{BeginSpecs}} | |||
{{Spec | Rise time | 250 ps}} | |||
{{Spec | Pulse frequency | 550 to 720 Hz }} | |||
{{Spec | Pulse length | 0.5 ns to 100 ns with a single charge line between the two charge line connectors, or up to 300 ns at half pulse rate with one open-ended charge line (other connector grounded)}} | |||
{{Spec | Pulse amplitude | Internal supply: 0 to 50 V variable in three ranges (0.5 V, 5 V, 50 V), positive or negative, or external up to ± 300 V}} | |||
{{EndSpecs}} | |||
[[File:Charge line animation.gif|250px|right]] | |||
The 109's operating principle is that of a | The 109's operating principle is that of a | ||
[http://en.wikipedia.org/wiki/Pulse_forming_network#Transmission_line_PFNs charged transmission line pulse generator] | [http://en.wikipedia.org/wiki/Pulse_forming_network#Transmission_line_PFNs charged transmission line pulse generator] | ||
with a mechanical reed switch and external 50 Ω transmission line/lines attached through two GR-874 50 Ω connectors. | with a mechanical reed switch and external 50 Ω transmission line/lines attached through two GR-874 50 Ω connectors. | ||
The length of the external cables determines the impulse width | The length of the external cables determines the impulse width. | ||
The internal voltage source is adjustable from 0 to 50 V. | The pulse-generating switch in the 109 is a mechanical [[mercury switch]], which limits pulse frequency to about 600 Hz. | ||
Moreover, this switch has a relatively short life time (200 hours) — if the operator forgets to shut the 109 down over the weekend and | |||
some holidays, the reed switch will need replacement. | |||
The internal voltage source is adjustable from 0 to 50 V in three ranges (0.5 V, 5 V, 50 V), either positive or negative. | |||
Using an external voltage source, pulses up to 300 V are possible. | Using an external voltage source, pulses up to 300 V are possible. | ||
==Repair issues== | ==Repair issues== |