511: Difference between revisions

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511 (view source)

Revision as of 08:12, 1 September 2014

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A revised version, the 511A, was [[introduced in 1950]]. [[Howard Vollum]] was directly involved with the design of the 511.   
A revised version, the 511A, was [[introduced in 1950]]. [[Howard Vollum]] was directly involved with the design of the 511.   


It uses a standard CRT, the [[5CP1A]]. The vertical output of the 511A is a pair of [[6AG7]] tubes,
==Specifications==
AC-coupled to the vertical deflection plates. 
 
The 511A does not have response down to DC. The frequency range is specified as 10 Hz to 10 MHz.  
The 511A does not have response down to DC. The frequency range is specified as 10 Hz to 10 MHz.  
There is also a 511AD. The "D" in the model number indicates that it has a L-C [[delay line]].
There is also a 511AD. The "D" in the model number indicates that it has a L-C [[delay line]].
The 511 weighs 65 pounds (29 kg) and consumes 180 W.  The 511A weighs 50 pounds (23 kg) and consumes 230 W.
The 511 weighs 65 pounds (29 kg) and consumes 180 W.  The 511A weighs 50 pounds (23 kg) and consumes 230 W.
[[Category:Specifications needed]] ''please add''
==Internals==
The 511 uses a standard CRT, the [[5CP1A]]. The vertical output of the 511A is a pair of [[6AG7]] tubes,
AC-coupled to the vertical deflection plates. 


Neither the 511 nor the 511A has a [[thermal cutoff]].  The 511AD was available through 1953.
Neither the 511 nor the 511A has a [[thermal cutoff]].  The 511AD was available through 1953.
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of regulation means that variations in mains voltage results in variation
of regulation means that variations in mains voltage results in variation
of deflection sensitivity.   
of deflection sensitivity.   
In the 511A, the CRT cathode and anode voltages are produced by a 2 kHz oscillator  
In the 511A, the CRT cathode and anode voltages are produced by a 2 kHz oscillator  
that is powered by the 511A's +225 V<sub>DC</sub> regulated supply.  This results in vertical
that is powered by the 511A's +225 V<sub>DC</sub> regulated supply.  This results in vertical
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The 511 and 511A use a [[6AL5]] tube (V3) as the disconnect diode for the sweep.
The 511 and 511A use a [[6AL5]] tube (V3) as the disconnect diode for the sweep.


Tektronix engineer Frank Hood recollects:
The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.
 
There was an option that added a 1 μs marker generator.
 
==History==
Tektronix engineer [[Frank Hood]] recollects:
<blockquote>My first assignment was to build or modify some special instruments for Bonneville Power. They wanted a device that would detect and record any lightning strikes or arc-overs on the high voltage power lines running between Vancouver, Wash. and other cities such as Longview, Spokane, etc. They wanted to detect each event, in a fraction of a millionth of a second, then to send a pulse of energy down the defective line and measure the time it took to return, (this was an application much like radar). They wanted markers displayed at each mile and fraction of a mile so that they could determine the exact location of the fault. They needed to record a photographic image for latter study. Two or more such instruments were built. We called these Type 511B. They worked very well and were used for several years.
<blockquote>My first assignment was to build or modify some special instruments for Bonneville Power. They wanted a device that would detect and record any lightning strikes or arc-overs on the high voltage power lines running between Vancouver, Wash. and other cities such as Longview, Spokane, etc. They wanted to detect each event, in a fraction of a millionth of a second, then to send a pulse of energy down the defective line and measure the time it took to return, (this was an application much like radar). They wanted markers displayed at each mile and fraction of a mile so that they could determine the exact location of the fault. They needed to record a photographic image for latter study. Two or more such instruments were built. We called these Type 511B. They worked very well and were used for several years.
</blockquote>
</blockquote>
[[John Addis]] says:
[[John Addis]] says:
<blockquote>
<blockquote>
The 511 was indeed somewhat crude. The vaunted calibrator which Vollum introduced to give people the sense that you could make real measurements is actually just a 60 Hz sine wave off the power transformer, not even a square wave, so it is completely unregulated. Fortunately for Vollum, both the calibrator and the CRT HV are unregulated. When the line voltage goes down, the scope sensitivity goes up (reduced hv makes beam converge less after plates). So the displayed calibrator amplitude is not very sensitive to line voltage.
The 511 was indeed somewhat crude. The vaunted calibrator which Vollum introduced to give people the sense that you could make real measurements is actually just a 60 Hz sine wave off the power transformer, not even a square wave, so it is completely unregulated. Fortunately for Vollum, both the calibrator and the CRT HV are unregulated. When the line voltage goes down, the scope sensitivity goes up (reduced HV makes beam converge less after plates). So the displayed calibrator amplitude is not very sensitive to line voltage.
</blockquote>
</blockquote>
The 511 and 511A were normally furnished with P1 [[phosphor]].  P7 and P11 were optional, at no extra charge.
There was an option that added a 1 μs marker generator.
==Specifications==
[[Category:Specifications needed]] ''please add''


==Links==
==Links==
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/12701"

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