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The Tektronix 556 is a [[dual-beam scopes|dual-beam scope]], the successor to the Tektronix [[555]]. | The Tektronix 556 is a [[dual-beam scopes|dual-beam scope]], the successor to the Tektronix [[555]]. | ||
It is a one-piece unit. | |||
== Comparison with the 555 == | |||
It is a one-piece unit whereas the 555 has a the power supply in a separate box. | |||
Triggering and sweep circuitry | |||
is integrated into the 556 mainframe, as opposed to | is integrated into the 556 mainframe, as opposed to | ||
the removable timing units in the 555. The 556 takes | the removable timing units in the 555. The 556 takes | ||
| Line 6: | Line 9: | ||
The bandwidth is 50MHz. | The bandwidth is 50MHz. | ||
The 556 is a true dual-beam scope and none of the signal paths is shared between the two beams. Electrically speaking, the power supply and the calibrator are the only parts that are common to both beams. Apart from the power supply, the 556 has almost complete left-right symmetry, corresponding to top and bottom beams. Although the beams can be operated completely independently, the 556 provides many options for routing signals between the vertical plug-ins, triggers, sweeps, horizontal amplifiers, and vertical amplifiers. For example, a common use for a dual-beam scope is to view two simultaneous single-shot events, both sweeps being triggered by one of the traces. For this purpose, the 556 allows the output of one sweep generator to be routed to the horizontal amplifier of the other beam, so it drives both beams. Many other more sophisticated modes are also available. | == Dual-Beam Modes == | ||
The 556 is a true dual-beam scope and none of the signal paths is shared between the two beams. Electrically speaking, the power supply and the calibrator are the only parts that are common to both beams. Apart from the power supply, the 556 has almost complete left-right symmetry, corresponding to top and bottom beams. Although the beams can be operated completely independently, the 556 provides many options for routing signals between the vertical plug-ins, triggers, sweeps, horizontal amplifiers, and vertical amplifiers. For example, a common use for a dual-beam scope is to view two simultaneous single-shot events, both sweeps being triggered by one of the traces. For this purpose, the 556 allows the output of one sweep generator to be routed to the horizontal amplifier of the other beam, so it drives both beams. Many other more sophisticated modes are also available. | |||
== Triggering == | |||
The triggering in the 556 is done using [[tunnel diodes]] | The triggering in the 556 is done using [[tunnel diodes]] | ||
and the trigger circuit sits on its own small PC board | and the trigger circuit sits on its own small PC board | ||
just behind the trigger source selection switch. | just behind the trigger source selection switch. | ||
== Vertical Amplifiers == | |||
The vertical amplifier of the 556 is solid state except for the input cathode followers ([[12AT7]]) and and the | The vertical amplifier of the 556 is solid state except for the input cathode followers ([[12AT7]]) and and the | ||
output stage ([[8608]]). | output stage ([[8608]]). | ||
| Line 16: | Line 23: | ||
A rack-mount version, the RM556 also exists. | A rack-mount version, the RM556 also exists. | ||
== Comparison with the 556 == | |||
The 556 superficially resembles the [[565]], | The 556 superficially resembles the [[565]], | ||
which is is also a dual-beam one-piece scope, but the 565 takes two | which is is also a dual-beam one-piece scope, but the 565 takes two | ||