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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 uses [[letter-series and 1-series plug-ins]]. A rack-mount version, the RM556 also exists. | ||
It | |||
== Dual-Beam Modes == | == Dual-Beam Modes == | ||
The 556 is a true dual-beam scope and none of the signal | The 556 is a true dual-beam scope and none of the signal path is shared between the two beams. Electrically speaking, the power supply and the calibrator are the only parts that are common to both beams. The 556 has almost complete left-right symmetry, corresponding to upper and lower 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 and vertical amplifiers. For example, a common use for a 556 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 == | == Triggering == | ||
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== Vertical Amplifiers == | == 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]]). | ||
== Comparison with the 555 == | |||
The 556 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 | |||
the removable timing units in the 555. The 556 takes | |||
two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]. | |||
The bandwidth is 50MHz. | |||
== Comparison with the | == Comparison with the 565 == | ||
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 | ||