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The Tektronix Type 111 Pretrigger Pulse Generator produces two pulse signals | {{Instrument Sidebar | ||
|manufacturer=Tektronix | |||
|model=111 | |||
|class=Pulse generator | |||
|series= | |||
|summary=Pretrigger Pulse Generator | |||
|image=Tek 111 front.jpg | |||
|caption=Front View | |||
|introduced=1960 | |||
|discontinued=(?) | |||
|designers= | |||
|manuals= | |||
* [[Media:070-252.pdf|Tektronix 111 Manual]] (PDF) | |||
* [http://w140.com/tek_fcp/tek_type_111_factory_cal_proc.pdf Tektronix 111 Factory Calibration Procedure (PDF)] | |||
}} | |||
The '''Tektronix Type 111 Pretrigger Pulse Generator''' produces two pulse signals, one to trigger an oscilloscope sweep and a main output pulse to stimulate the device under test. | |||
The trigger pulse comes between 30 and 250 nanoseconds before the output pulse; this is controlled by a knob on the 111. This gives adequate time for the oscilloscope to start sweeping so that the leading edge of the input or output signals of the device under test can be viewed. The alternative is to have a [[delay line]] in the signal path, after the trigger pickoff, but delay lines degrade transient performance. Using a pretrigger eliminates the need for a delay line in the vertical signal path and therefore enables accurate high-speed measurements. For a stable display, low jitter of the delay between pretrigger and main pulse is essential. | |||
{{BeginSpecs}} | |||
{{Spec | Pulse repetition rate | 10 Hz to 100 kHz, or by external trigger }} | |||
{{Spec | Rise time | <500 ps }} | |||
{{Spec | Pre-trigger | 30−250 ns variable with additional calibrated "+1 ns" switch, jitter ≤100 ps }} | |||
{{Spec | Output amplitude | ≥10 V (selectable polarity) into 50 Ω }} | |||
{{EndSpecs}} | |||
==Internals== | |||
The main output pulse of the Type 111 is produced by an avalanche transistor. | |||
==Notes== | |||
The Auxiliary Equipment section in the [[N|Type N]] manual says the rise time is 300 ps. The 111 front panel and manual specify <500 ps. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek 111 front.jpg|Front View | |||
Tek_111-Front.jpg | Front | |||
Tek_111_left.jpg|Left Internal View | |||
Tek 111 left internal.jpg|Left Internal View | |||
Tek 111 right.jpg|Right Internal View | |||
Tek 111 right internal.jpg|Right Internal View | |||
Tek_111_rear.jpg|Late serial number rear view | |||
Tek_111-Rear.jpg | Rear | |||
Tek 111 rear2.jpg|Early serial number rear view | |||
Tek 111 schem.gif|Schematic | |||
Tek 110 or 111 and type n diode measure.jpg | |||
Tek type 111 two triggers per pulse 1.jpeg|111 with two triggers per pulse switch | |||
Tek type 111 two triggers per pulse 2.jpeg|111 with two triggers per pulse switch | |||
Tek type 111 two triggers per pulse 3.jpeg|111 with two triggers per pulse switch | |||
</gallery> | </gallery> | ||
[[Category:Pulse generators]] |