067-0681-01: Difference between revisions
Jump to navigation
Jump to search
(Created page with "* [http://w140.com/tek_067-0681-01.pdf Tektronix 067-0681-01 Datasheet (PDF)]") |
No edit summary |
||
| Line 1: | Line 1: | ||
The Tektronix 067-0681-01 is a pulse generator | |||
for adjusting the transient response of high frequency oscilloscopes | |||
such as the [[475]], [[485]], [[7A11]], [[7A24]], [[7A19]]/[[7904]], and [[7A29]]/[[7104]]. | |||
It takes in a 60 to 100Vpp rectangular waveform | |||
(e.g., from the calibrator output of an oscilloscope) | |||
and produces a 250mVpp rectangular waveform | |||
with risetime less than or equal to 125 picoseconds. | |||
The input and output connectors are [[Connectors#BNC|BNC]]. | |||
The gender of the pulse output connector is appropriate for | |||
connecting directly to a BNC input of an oscilloscope | |||
(i.e., with no cable between the pulse generator and the oscilloscope | |||
to spoil the risetime). | |||
A regular BNC cable is typically used for connecting the input that drives | |||
the 067-0681-01. The risetime of the input to to the 067-0681-01 is not | |||
important. | |||
The circuit starts with a DC restorer. | |||
The output of the DC restorer turns a current source on and off. | |||
The current produced by the current source | |||
(at the collector of PNP Q1) | |||
is set by controlling the emitter current using 6.3V zener diode CR3, | |||
R1, R2, and Vbe of Q3. | |||
R1 is a 200-ohm potentiometer (assume 100 ohms). | |||
R2 is 390 ohms. | |||
* (6.2V - 0.7V) / (100 ohms + 390 ohms) = 11.2mA | |||
The output pulse is produced by a 10mA 2pF tunnel diode, part number [[152-0177-02]]. | |||
* [http://w140.com/tek_067-0681-01.pdf Tektronix 067-0681-01 Datasheet (PDF)] | * [http://w140.com/tek_067-0681-01.pdf Tektronix 067-0681-01 Datasheet (PDF)] | ||