3B4: Difference between revisions

3B4 (view source)

Revision as of 17:37, 3 February 2018

4 bytes removed , 3 February 2018

no edit summary

Kurt

Bureaucrats, Interface administrators, Suppressors, Administrators

32,959

edits

@@ Line 11: / Line 11: @@
 * [http://w140.com/3b4.pdf Tektronix 3B4 Manual (PDF)]
 }}
-The '''Tektronix Type 3B4''' is a timebase plug-in for [[560-series scopes]].  It was introduced in 1964.
+The '''Tektronix Type 3B4''' is a timebase plug-in for [[560-series scopes]].
+It was introduced in 1964.
-It was intended primarily for use with the [[561A]], but works fine in other 560-series scopes.  The 3B4 is unusual in having an explicit "FREE RUN" mode.
+It was intended primarily for use with the [[561A]], but works fine in other 560-series scopes.
+The 3B4 is unusual in having an explicit "FREE RUN" mode.
-In the triggered modes, the [[tunnel diodes|tunnel diode]]-based triggering is rated to work to 20 MHz.  The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate.
+In the triggered modes, the [[tunnel diodes|tunnel diode]]-based triggering is rated to work to 20 MHz.
+The vertical bandwidth of typical 560-series (non-sampling) scopes is about 10 MHz, so 20 MHz is adequate.
-Triggering is done with a [[TD3A]] 4.7 mA tunnel diode.  The trigger input is amplified and buffered by a [[6DJ8]]-based differential amplifier driving a common-emitter [[2N964]] germanium PNP transistor whose collector current switches the tunnel diode.
+Triggering is done with a [[TD3A]] 4.7 mA tunnel diode.
+The trigger input is amplified and buffered by a [[6DJ8]]-based differential amplifier driving a common-emitter
+[[2N964]] germanium PNP transistor whose collector current switches the tunnel diode.
 The [[283]] Real Time adapter enables real-time sweeps with a 3B4.