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1A4: Difference between revisions
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similar to what a dual-beam scope can do, but without some of the cost and complexity. | similar to what a dual-beam scope can do, but without some of the cost and complexity. | ||
Like the Type [[1A2]] and unlike the Type [[1A1]], the Type 1A4 has a Trigger Output selector that controls | Like the Type [[1A2]] and unlike the Type [[1A1]], the Type 1A4 has a Trigger Output selector that controls which channel provides triggering when the mainframe trigger is in Plug-In mode, | ||
which channel provides triggering when the mainframe trigger is in Plug-In mode, | |||
for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]). | for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]). | ||
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From there the vertical signal path goes through an NPN emitter follower, then an NPN differential amplifier, at which point the signal becomes differential. | From there the vertical signal path goes through an NPN emitter follower, then an NPN differential amplifier, at which point the signal becomes differential. | ||
Next, the signal passes through an analog multiplexer made with [[1N4152]] silicon switching diodes. | Next, the signal passes through an analog multiplexer made with [[1N4152]] silicon switching diodes. | ||
After the multiplexer network, the signal passes through a common base amplifier followed by [[6DJ8]] tube operating in common grid configuration. | After the multiplexer network, the signal passes through a common base amplifier followed by [[6DJ8]] tube operating in common grid configuration. | ||
There is an "identify" switch for each channel, which when pressed shifts the trace up by ~ | There is an "identify" switch for each channel, which when pressed shifts the trace up by ~3 mm, to aid identification of the corresponding signal/channel. | ||
This is achieved by offsetting position control circuitry with a small resistance to shift position. | This is achieved by offsetting position control circuitry with a small resistance to shift position. | ||
The 12. | The 12.1 V and −15 V power for the plug-in is generated onboard using a step-up transformer, whose primary is connected to the 6.3 V heater supply from the mainframe and the two secondaries drive the onboard series regulators. | ||
==Pictures== | ==Pictures== | ||