524: Difference between revisions

{{Oscilloscope Sidebar  

|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 calibration checklist.pdf|524 Calibration Checklist]]

The '''Tektronix 524AD''' is a monolithic oscilloscope [[introduced in 1953]] for monitoring television waveforms, designed by [[Cliff Moulton]].

In a 1972 interview, [[Charlie Rhodes]] recalled:

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>

{{Spec | Time markers | 1 μs, 100 ns, 50 ns, 318 ns, 1.59 μs (200 or 40 markers per TV line) }}

{{Spec | CRT | [[5ABP1]] (P1 [[phosphor]]) standard, P7 and P11 optional; 4 kV total acceleration (−1.5 kV/+2.5 kV) }}

 

It uses [[selenium rectifiers]] in the low-voltage power supply.   

 

The 524AD has a 56°C/133°F [[thermal cutoff]]. 

 

* [[Media:Tektronix Photo Manual 1952.pdf| Tektronix Photo Manual 1952]]

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.

Here, the there is clamping and amplification and, most importantly, a non-retriggerable multivibrator.   

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 strips|ceramic terminal strip]], which is less common than the straight style.

Tek 524 trace.jpg|Displaying a squarewave

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

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