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The Tektronix Type 109 is a pulse generator [[introduced in 1962]].
{{Instrument Sidebar
It uses a [[Connectors#GR-874|GR-874]] 50-ohm output connector
|manufacturer=Tektronix  
and has a specified rise time of 250ps.  
|model=109
Pulse width can be programmed with a external 50 Ohm cable
|class=Pulse generator
through two GR-874 50-ohm connectors. 
|series=
The maximum allowed impulse width is 50nS.
|summary=pulse generator
The internal voltage source is adjustable from 0V to 50V. 
|image=109 front crop.jpg
Using an external voltage source, pulses up to 300V are possible.
|caption=Tek 109 front
|introduced=1962
|discontinued=(?)
|designers=
|manuals=
* [[Media:070-299.pdf|Tektronix 109 Manual]] (PDF)
* [[Media:062-0105-00.pdf|017-0067-00 Charging Network Datasheet]]
}}
The '''Tektronix Type 109''' is a pulse generator [[introduced in 1962]].  


The special feature of the 109 is that the switching action is made directly by a  
It uses a [[GR-874]] 50 Ω output connector and has a specified rise time of 250 ps.  
[[mercury switch]]. Frequency and life time was therefore fairly short,
about 600Hz and 200 hours.  
So, if the operator forgets to shut the 109 down over the weekend and
some holidays, the reed switch will need replacement.
Be aware during servicing, the thermal breaker is on
full mains and has no protection cover!


* [http://bama.edebris.com/download/tek/109/tek%20109.v6.pdf Tektronix 109 Manual (PDF)]
{{BeginSpecs}}
* [http://w140.com/slac-tn-71-027.pdf Report comparing RG-58 with RG-174 using Tek 109 and Tek 661 (PDF)]
{{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}}


==Internals==
[[File:Charge line animation.gif|250px|right]]
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] 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.
Using two transmission lines of non-equal length, alternating pulses having different width can be produced. 
Alternatively, an R-C network can be used to create pulses with R-C decay characteristic but longer duration.
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 external voltage sources, pulses up to 300 V of either polarity are possible, including alternating positive/negative pulses.
==Repair issues==
Be aware during servicing that the thermal breaker is on full mains and has no protection cover!
==Links==
* [http://cds.linear.com/docs/en/application-note/an120f.pdf Jim Williams, Linear Technology Application Note 120, "1 ppm Settling Time Measurement for a Monolithic 18-Bit DAC"] - see Appendix H (p.30)
* [https://w140.com/slac-tn-71-027.pdf Report comparing RG-58 with RG-174 using Tek 109 and Tek 661 (PDF)]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/109.html Tek 109 page @ amplifier.cd]
==Pictures==
<gallery>
<gallery>
Image:109_front.jpg|Front view
109_front.jpg         | Front view
Image:109_right.jpg|Right internal
109_right.jpg         | Right internal
Image:109_left.jpg|Left internal
109_left.jpg         | Left internal
Image:109_back.jpg|Rear view Connector not original
109_back.jpg         | Rear view (connector not original)
Image:109_impulse.jpg|flying spot caught with 7904, S6, 7T11, 7M11. 2.5Vpk, Tr=240pS
109_impulse.jpg       | flying spot caught with 7904, S6, 7T11, 7M11. 2.5 V<sub>pk</sub>, T<sub>r</sub>=240 ps
File:Tek 109 schematic.png|schematic
Tek 109 schematic.png | schematic
Tek-017-067.jpg      | [[017-067]] Charge network for 109
017-067.jpg          | 017-067 Charge network for 109 (description)
Tek 109 front.jpg
Tek 109 front2.jpg
Tek 109 top.jpg|top
Tek 109 bottom.jpg|bottom
</gallery>
</gallery>
[[Category:Pulse generators]]
[[Category:introduced in 1962]]
[[Category:GR874]]

Latest revision as of 10:08, 18 August 2021

Tektronix 109
pulse generator
Tek 109 front

Produced from 1962 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type 109 is a pulse generator introduced in 1962.

It uses a GR-874 50 Ω output connector and has a specified rise time of 250 ps.

Key Specifications

Rise time 250 ps
Pulse frequency 550 to 720 Hz
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)
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

Internals

The 109's operating principle is that of a 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. The length of the external cables determines the impulse width. Using two transmission lines of non-equal length, alternating pulses having different width can be produced. Alternatively, an R-C network can be used to create pulses with R-C decay characteristic but longer duration.

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 external voltage sources, pulses up to 300 V of either polarity are possible, including alternating positive/negative pulses.

Repair issues

Be aware during servicing that the thermal breaker is on full mains and has no protection cover!

Links

Pictures

  • Front view

    Front view

  • Right internal

    Right internal

  • Left internal

    Left internal

  • Rear view (connector not original)

    Rear view (connector not original)

  • flying spot caught with 7904, S6, 7T11, 7M11. 2.5 Vpk, Tr=240 ps

    flying spot caught with 7904, S6, 7T11, 7M11. 2.5 Vpk, Tr=240 ps

  • schematic

    schematic

  • 017-067 Charge network for 109

    017-067 Charge network for 109

  • 017-067 Charge network for 109 (description)

    017-067 Charge network for 109 (description)

  • top

    top

  • bottom

    bottom

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