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=== No Vertical Amplifier === | === No Vertical Amplifier === | ||
The 519 is very unusual in that it does not contain vertical amplifiers. | The 519 is very unusual in that it does not contain vertical amplifiers. | ||
The input signal is passively connected to the | The input signal is passively connected to the [[distributed vertical deflection plates]] of the CRT, which are driven single-ended. | ||
[[distributed vertical deflection plates]] of the CRT, | |||
which are driven single-ended. | |||
This allows the scope to have 1 GHz bandwidth. | This allows the scope to have 1 GHz bandwidth. | ||
The vertical deflection factor is approximately 10 V/cm. | The vertical deflection factor is approximately 10 V/cm. | ||
=== CRT === | === CRT === | ||
The viewing area is two centimeters vertical, six centimeters | The viewing area is two centimeters vertical, six centimeters horizontal. The spot diameter on the CRT is 0.1 mm, | ||
horizontal. The spot diameter on the CRT is 0.1 mm, | |||
which corresponds to 100 mV at the input connector. | which corresponds to 100 mV at the input connector. | ||
Each CRT was individually characterized for risetime and | Each CRT was individually characterized for risetime and deflection sensitivity and the precise value was written | ||
deflection sensitivity and the precise value was written | on the CRT and on the CRT bezel. For serial numbers 1016 and below, the CRT part number is [[154-356]]. | ||
on the CRT and on the CRT bezel. For serial numbers 1016 and below, | For serial numbers 1017 and up, the CRT part number is [[154-308]]. | ||
the CRT part number is [[154-356]]. For serial numbers 1017 and up, the | |||
CRT part number is [[154-308]]. | |||
=== 125 Ω Input Impedance === | === 125 Ω Input Impedance === | ||
The input to the 519 has an impedance of 125 Ω. | The input to the 519 has an impedance of 125 Ω. | ||
The input connector is a special | The input connector is a special 125 Ω [[GR-874 connector]] made by Tektronix | ||
that is neither electrically nor mechanically compatible with the much more | that is neither electrically nor mechanically compatible with the much more | ||
common 50 Ω GR-874 connector. Tek made a resistive impedance matching | common 50 Ω GR-874 connector. Tek made a resistive impedance matching | ||
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=== Rigid Coax Delay Line === | === Rigid Coax Delay Line === | ||
To allow viewing of the leading edge of pulses, there is a | To allow viewing of the leading edge of pulses, there is a rigid coaxial 45 ns [[delay line]] between the input and the CRT. | ||
rigid coaxial 45 ns [[delay line]] between the input and the CRT. | |||
[[File:519delay.jpg|thumb]] | [[File:519delay.jpg|thumb]] | ||
Note that 45 nanoseconds is an unusually short delay. | Note that 45 nanoseconds is an unusually short delay. For comparison, the delay line in a [[547]] is 170 ns. | ||
For comparison, the delay line in a [[547]] is 170 ns. | Keeping the delay short minimizes degradation of fast pulses, but it necessitates a trigger and sweep circuit with quick response. | ||
Keeping the delay short minimizes degradation of fast pulses, | |||
but it necessitates a trigger and sweep circuit with quick response. | |||
A 519 can also be used with a pretrigger pulse generator like the [[111]]. | A 519 can also be used with a pretrigger pulse generator like the [[111]]. | ||
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=== Trigger and Sweep === | === Trigger and Sweep === | ||
The sweep is triggered using a 20 mA, 4 pF [[tunnel diodes|tunnel diode]]. | The sweep is triggered using a 20 mA, 4 pF [[tunnel diodes|tunnel diode]]. | ||
The horizontal deflection ramp signal of a 519 is generated | The horizontal deflection ramp signal of a 519 is generated by a [[4CX250F]] external anode, radial-beam tube that is cooled | ||
by a [[4CX250F]] external anode, radial-beam tube that is cooled | |||
by forced air sent from a blower through a duct. | by forced air sent from a blower through a duct. | ||
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The mass of these extra components necessitated a larger, sturdier cabinet than, for example, the [[545]]. | The mass of these extra components necessitated a larger, sturdier cabinet than, for example, the [[545]]. | ||
The sheet aluminum used in the case of the 519 is thicker than that of the other Tek scopes of the period. | The sheet aluminum used in the case of the 519 is thicker than that of the other Tek scopes of the period. | ||
The 519 weighs 99 pounds and | The 519 weighs 99 pounds and consumes 650 watts. | ||
== Different CRT Bezels == | == Different CRT Bezels == | ||
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later period was Mark Balcom. | later period was Mark Balcom. | ||
The distributed deflection plate delay network had to be hand-trimmed, which was done | The distributed deflection plate delay network had to be hand-trimmed, which was done prior | ||
to putting it inside the CRT envelope. It is possible that this was done using a TDR. | to putting it inside the CRT envelope. It is possible that this was done using a TDR. | ||
== 519C: A 3 GHz Version of the 519 == | == 519C: A 3 GHz Version of the 519 == | ||
Tektronix Catalog 22 (mid'63-mid'64) refers to a modified 519 with response extended to 3 GHz : | Tektronix Catalog 22 (mid'63-mid'64) refers to a modified 519 with response extended to 3 GHz: | ||
<blockquote> | <blockquote> | ||
DC-to-3 GIGACYCLE OSCILLOSCOPE: | DC-to-3 GIGACYCLE OSCILLOSCOPE: | ||