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The Tektronix 524 is an oscilloscope that is designed for monitoring television waveforms.
{{Oscilloscope Sidebar
It is a monolithic oscilloscope.  It has a [[thermal cutoff]].
|manufacturer=Tektronix
|series=
|model=524AD
|summary=TV waveform monitoring scope
|image=Tek 524 trace.jpg
|caption=Tektronix 524AD
|introduced=1953
|discontinued=(?)
|designers=Cliff Moulton
|manuals=
* [[Media:070-236.pdf|524AD Instruction Manual 070-236]]
* [[Media:Tek_524AD_OCRed.pdf|524AD Instruction Manual]] (OCR)
* [[Media:Tek 524 cal procedure.pdf|524 cal procedure]]
}}
The '''Tektronix 524AD''' is a monolithic oscilloscope [[introduced in 1953]] for monitoring television waveforms, designed by [[Cliff Moulton]].


Interestingly, the 524 appears on page 33 of the [http://www.americanradiohistory.com/Archive-Catalogs/RCA-Test-Equip-1966.pdf 1966 RCA Test Equipment Catalog].
In a 1972 interview, [[Charlie Rhodes]] recalled:
<blockquote>
In 1953 Cliff Moulton re-designed the [[514]] for TV station needs. This became the 524, the first TV-oriented instrument. It looked like a market of 200 or so in those days, but wound up producing 10,000 of this model.
</blockquote>


The 524 weighs 61 pounds and uses 500 watts.  It uses [[selenium rectifiers]] in the low-voltage  
Interestingly, the 524 appears on page 31 of the [https://www.w140.com/RCA-Test-Equip-1966.pdf 1966 RCA Test Equipment Catalog].
power supply.  It has a total of 4kV CRT beam acceleration,  
 
-1.5kV on the cathode and +2.5kV on the anode.  It normally came with a [[5ABP|5ABP1]] CRT which has P1 [[phosphor]],
{{MissingSpecs}}
 
The 524 weighs 61 pounds, uses 500 watts, and has a [[thermal cutoff]].  It uses [[selenium rectifiers]] in the low-voltage  
power supply.  It has a total of 4 kV CRT beam acceleration,  
−1.5 kV on the cathode and +2.5 kV on the anode.   
It normally came with a [[5ABP1]] CRT which has P1 [[phosphor]],
but P7 and P11 phosphors were also available.
but P7 and P11 phosphors were also available.


==Links==
* [[Media:Tektronix Photo Manual 1952.pdf| Tektronix Photo Manual 1952]]
==Internals==
The vertical signal path of the 524 is similar to that of the [[514]].   
The vertical signal path of the 524 is similar to that of the [[514]].   
They have similar front-ends and [[distributed amplifier|distributed vertical output amplifiers]].
They have similar front-ends and similar [[distributed amplifier|distributed vertical output amplifiers]].
 
The video trigger circuitry present in the 524 distinguish it from the 514.
Just before the L-C [[delay line]] in the vertical signal path, there is a
cathode follower, V15A, that serves as the trigger pickoff buffer.
The resulting trigger signal goes to a video sync separator circuit.
Here, the there is clamping and amplification and,
most importantly, a non-retriggerable multivibrator. 
The multivibrator is triggered by the vertical sync of the NTSC waveform.
After being triggered, it is not triggerable again for about about 25 ms, so it
misses the vertical sync of the next interlaced field and instead triggers on
the vertical sync of one following that.  So it consistently shows the "even" field
or the "odd" field.  There is a switch that perturbs the multivibrator so it can be
switched between even and odd fields.  The video trigger circuit drives a
conventional trigger circuit and sweep circuit similar to that of the 514.
 
The 524 uses a cylindrical style of ceramic terminal strip, which is less common than the straight style.
The cylindrical style is also used in the [[C|Type C]], [[CA|Type CA]], and [[315]].


* [http://bama.edebris.com/download/tek/524ad/Tek%20524AD.pdf Tektronix 524AD Manual (PDF)]
* [https://w140.com/tek_524_cal_checklist.pdf Tektronix 524 Calibration Checklist (PDF)]


==Pictures==
<gallery>
<gallery>
Image:Tek 524ad front fl.jpg
Tek 524 trace.jpg|Displaying a squarewave
Image:Tek 524ad front.jpg
Tek 524ad front fl.jpg
Tek 524ad front.jpg
Tek 524 marker switch.jpg|Marker switch
Tek 524 round terminal strip.jpg|Unusual round terminal strips in the 524
Tek 524 internal.jpg|Top right internal view
Tek 524 selenium rectifier.jpg|Selenium rectifier and unusual fan mount
Image:TimeMarkGenFor524.jpg|Time Mark Gen for 524
Image:TimeMarkGenFor524.jpg|Time Mark Gen for 524
Tek 524 syncsep.png|Sync Separator
Tek 524 bottom front2.jpg|Bottom front, power supply circuitry
Tek 524 bottom rear2.jpg|Bottom rear, transformer wiring
Tek 524ad cl1.jpg
Tek 524ad cl2.jpg
Tek 524ad cl3.jpg
524AD-cartoon-1960.jpg  | [[Cartoons|Cartoon]] in 1960 version of circuit diagrams
</gallery>
</gallery>
===Early model===
<gallery>
Tek early 524ad 1.jpg
Tek early 524ad 2.jpg
Tek early 524ad 3.jpg
Tek early 524ad 4.jpg
Tek early 524ad 5.jpg
Tek early 524ad 6.jpg
Tek early 524ad 7.jpg
Tek early 524ad 8.jpg
Tek early 524ad 9.jpg
</gallery>
{{Parts|524}}
[[Category:Monolithic tube scopes]]
[[Category:TV waveform monitors]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/6066...77781"

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