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3B1: Difference between revisions
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The Tektronix 3B1 is a timebase plug-in [[introduced in 1962]] for [[560-series scopes]]. | The Tektronix 3B1 is a timebase plug-in [[introduced in 1962]] for [[560-series scopes]]. | ||
10MHz is is the maximum trigger frequency. | 10MHz is is the maximum trigger frequency. | ||
The calibrated sweep rates go from 1 | The calibrated sweep rates go from 1 s/Div to 500 ns/Div. | ||
There is a switch that enables | There is a switch that enables 5 × horizontal magnification, | ||
which makes the fastest sweep 100 | which makes the fastest sweep 100 ns/Div. The 3B1 has a delayed sweep | ||
and a regular sweep. The 3B1 uses vacuum tubes, bipolar junction transistors, | and a regular sweep. The 3B1 uses vacuum tubes, bipolar junction transistors, | ||
and [[tunnel diodes]]. | and [[tunnel diodes]]. | ||
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compares the sweep ramp voltage with a knob-controlled | compares the sweep ramp voltage with a knob-controlled | ||
DC voltage which determines the point where the delayed trigger starts. | DC voltage which determines the point where the delayed trigger starts. | ||
The DC voltage is made by a [[ZZ1000]] | The DC voltage is made by a [[ZZ1000]] 80 V reference passed through | ||
a potentiometer-variable voltage divider. | a potentiometer-variable voltage divider. | ||
When the sweep ramp exceeds the control voltage, a 2. | When the sweep ramp exceeds the control voltage, a 2.2 mA tunnel diode in the | ||
plate load of the differential amplifier switches state. | plate load of the differential amplifier switches state. | ||
| Line 38: | Line 38: | ||
File:3b1 horizontal amp.png|Horizontal amp circuit | File:3b1 horizontal amp.png|Horizontal amp circuit | ||
</gallery> | </gallery> | ||
[[Category:560 series plugins]] | |||