The Tektronix Type 115 is a pulse generator which generates pulses with controllable characteristics, for a 50R environment. Maximum repetition rate is 10 MHz, maximum amplitude 10 V (inverted or not) and minimum rise and fall time of 10 ns. A dc offset can be added. Rise time, fall time, pulse width, period can be controlled.  Pulses can be delayed, paired or in bursts. Two 115 units can be used together for extra flexibility.

The high minimum rise time of 10 ns make it less useful for checking the pulse response of oscilloscopes with bandwidth greater than 3.5 MHz, unless some calculations are performed to take the limited risetime into account. Then the lower practical limit of risetime measurements is 10 ns (35 MHz).

No IC's are used, however, some germanium diodes (some selected by Tek) and also two unobtanium tunnel diodes might make repair difficult.

Option 146B removes the cabinet.

Tektronix Type 115 Pulse Generator

Connection of the 115 to a S-4 sampling head (14 GHz, 25 ps rise time) to a 7S12 with sampling head extender. The 7T12 is used as sampler. The pretrig out goes to a S-53 trigger recognizer via a 20 dB attenuator.

Tektronix Type 115 Pulse Generator

7S12 in 7623A mainframe. Note that 10 ns/div is actually the largest time/div. This system is way too fast for the 115...

Tektronix Type 115 Pulse Generator

Detail of 7S12.

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Paired pulse illustration on 7403N (65 MHz) mainframe with 7A24 (400 MHz) vertical amplifier and 7B87 time base. 

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

14 GHz sampling system.

Tektronix Type 115 Pulse Generator

Same pulse on 65 MHz mainframe with 400 MHz vertical amplifier.

Tektronix Type 115 Pulse Generator

Same pulse on a modern 50 MHz digital sampling oscilloscope (Rigol DS1054Z), with external 50R termination. Discrepancies are due to different base systems, different cable and termination quality and construction.

Tektronix Type 115 Pulse Generator

Could use a little bit of IPA.

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Top.

Tektronix Type 115 Pulse Generator

Top, detail.

Tektronix Type 115 Pulse Generator

Bottom.

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix branded capacitors ('condensers'). The vertical integration at Tektronix eventually leaded to the downsizing of the company.

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator

Tektronix Type 115 Pulse Generator