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early delay line is not "before" the vertical amp, it's in the middle
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m (early delay line is not "before" the vertical amp, it's in the middle)
 
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The Type 531 is a 10MHz oscilloscope, the first one made that accepts [[letter-series and 1-series plug-ins]].
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=5000-series scopes
|model=531
|summary=10 MHz oscilloscope
|image=Tek 531a g front.jpg
|caption=Tektronix 531
|introduced=1954
|discontinued=1973
|designers=Dick Rhiger
|manuals=
'''531'''
* [[Media:070-203.pdf|Tektronix 531/541 Manual]] (OCR)
* [[Media:tek_531_fcp.pdf|531 Factory Calibration Procedure]] (OCR)
 
'''531A'''
* [[Media:070-301.pdf|Tektronix RM31A Manual]]
* [[Media:tek_531a_fcp.pdf|531A Factory Calibration Procedure]] (OCR)
* [[Media:Tek 531a fcp feb 1968.pdf|531A Factory Calibration Procedure, February 1968]]
* [[Media:Tek 531a mods.pdf|Tektronix 531A Modifications]]
}}
The '''Tektronix Type 531''' is a 10 MHz oscilloscope that accepts [[letter-series and 1-series plug-ins]].
It is exactly like Type [[535]] except it does not have the Delayed Sweep (dual timebase) feature.
It is exactly like Type [[535]] except it does not have the Delayed Sweep (dual timebase) feature.
It was [[introduced in 1954]] simultaneously with Type 535, and superseded in 1959 by Type 531A,
which has more convenient controls and a slightly faster (15MHz) vertical amplifier.


There is also a rack-mount 531A, Type RM31A.
The 531 and 535 were the first Tektronix scopes to accept plug-ins.
The RM31A has a sliding chassis so that the scope can be  
It was [[introduced in 1954|introduced in March 1954]] simultaneously with the Type 535,
serviced without removing it from a rack.
and [[introduced in 1959|superseded in 1959]] by the Type 531A,
which has more convenient controls and a slightly faster (15 MHz) vertical amplifier.
 
In serial numbers 101 to 7600, the 531's L-C [[delay line]] is in the middle of the vertical amplifier. 
In serial numbers 7601 and up, the 531's delay line is between the vertical amplifier and the CRT.
This change was the result of [[John Kobbe]]'s insight that if the far end of the delay line was an open circuit (which the CRT approximates),
the reflected wave could be absorbed at the source end.
This "single termination" approach made it possible to do away with the input chassis.
All subsequent Tek scopes with a lumped-constant delay line used this topology.
 
There is also a rack-mount version, Types RM31 and RM31A.
They have a sliding chassis so that the scope can be serviced without removing it from a rack.


* [http://bama.edebris.com/download/tek/531_541/531_541.djvu Tektronix 531/541 Manual (DjVu)]
The [[532]] is similar to the 531, but designed to be more reliable at the expense of slower risetime.
* [http://manoman.sqhill.com/pdf/tek-531-541.pdf Tektronix 531/541 Manual (PDF)]
The [[541]] is mostly the same as the 531, but has a [[distributed amplifier|distributed vertical amplifier]]  
for 30 MHz bandwidth, and a different CRT.


{{BeginSpecs}}
{{SpecGroup | 531 SN 101-7600}}
{{Spec | Bandwidth | DC to 10 MHz (≤ 3 dB) with [[A|Type A plug-in]]  }}
{{Spec | Rise time | 0.035 μs }}
{{SpecGroup | 531 SN 7601 up  & 531A}}
{{Spec | Bandwidth | DC to 15 MHz (≤ 3 dB) with [[K|Type K plug-in]]  }}
{{Spec | Rise time | 0.024 μs }}
{{SpecGroup | all}}
{{Spec | Line Voltage | 108/115/122/216/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz. }}
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Power Consumption | 475W with  plug-in }}
{{Spec | Cooling  | AC Fan }}
{{Spec | Trigger Modes | AC/DC/AC LF Reject, and HF Sync}}
{{Spec | Anode Potential | 10 kV (relative to cathode)}}
{{Spec | Screen Area | 6 cm × 10 cm}}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Weight| 61,5 lbs / 27,8 kg }}
{{EndSpecs}}
==Links==
{{Documents|Link=531}}
{{Documents|Link=531A}}
==Pictures==
===531===
<gallery>
<gallery>
Image:rm31a.jpg|RM31A
531_early_1.jpg         | early 531 with [[C|Type 53C]]
Image:Tek 531a on cart.JPG|531A on cart
Tek 531 brown 1.jpg    | Brown-era 531 with [[CA|Type CA]]
Tek 531 brown 2.jpg    | Brown-era 531 with [[CA|Type CA]]
Tek 531 brown 3.jpg    | Brown-era 531 Rear
</gallery>
</gallery>
===531A===
<gallery>
Tek 531a g front.jpg
Tek 531a trace.jpg
Tek 531a on cart.JPG    | 531A on [[202]] cart
Tek 531a on cart.jpg    | 531A on [[500]]/[[53]]cart
Tek 531a 34 pr.jpg      | 531A Overwiev
Tek 531a front.jpg      | 531A Front
Tek 531a right top.jpg  | 531A Timebase ciruit
Tek 531a right2.jpg    | 531A Power supply
Tek 531a right 3.jpg    | 531A Rectifier board
Tek 531a right.jpg      | 531A Inside left
Tek 531a left close.jpg | 531A Vertical amplifier
Tek 531a left.jpg      | 531A Inside right
Tek 531a manual compartment.jpg | manual compartment
</gallery>
===RM31A===
<gallery>
rm31a.jpg              | RM31A
</gallery>
==Components==
{{Parts|531}}
{{Parts|531A}}
{{Parts|RM31A}}
[[Category:500 series scopes]]
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