109

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. Pulse width can be programmed with a external 50 Ω cable through two GR-874 50 Ω connectors. The maximum allowed impulse width is 50 ns. The internal voltage source is adjustable from 0 to 50 V. Using an external voltage source, pulses up to 300 V are possible.

The special feature of the 109 is that the switching action is made directly by a mercury switch. Frequency and life time was therefore fairly short, about 600 Hz 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!

• Tektronix 109 Manual (PDF)
• Report comparing RG-58 with RG-174 using Tek 109 and Tek 661 (PDF)

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  Front view

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  Right internal

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  Left internal

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  Rear view Connector not original

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  flying spot caught with 7904, S6, 7T11, 7M11. 2.5 V_pk, T_r=240 ps

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  schematic