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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar
title=Tektronix 531|
|manufacturer=Tektronix
summary=10 MHz scope |
|series=500-series scopes
image=Tek 531a front.jpg |
|model=531
caption=Tektronix 531 |
|summary=10 MHz oscilloscope
introduced=1954 |
|image=Tek 531a g front.jpg
discontinued=1972 |
|caption=Tektronix 531
manuals=
|introduced=1954
* [http://bama.edebris.com/download/tek/531_541/531_541.djvu Tektronix 531/541 Manual (DjVu)]
|discontinued=1973
* [http://w140.com/mmm/tek-531-541.pdf Tektronix 531/541 Manual (PDF)]
|designers=Dick Rhiger
* [http://w140.com/tek_fcp/tek_type_531_factory_cal_proc.pdf Tektronix 531 Factory Calibration Procedure (PDF)]
|manuals=
* [http://w140.com/tek_fcp/tek_type_531a_factory_cal_proc.pdf Tektronix 531A Factory Calibration Procedure (PDF)]  
'''531'''
* [[Media:070-203.pdf|Tektronix 531/541 Manual]]
* [[Media:tek_531_fcp.pdf|531 Factory Calibration Procedure]]
 
'''531A'''
* [[Media:070-301.pdf|Tektronix RM31A Manual]]
* [[Media:tek_531a_fcp.pdf|531A Factory Calibration Procedure]]
* [[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.


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.
The designer was [[Dick Rhiger]].


The 531 and 535 were the first Tektronix scopes to accept plug-ins.
The 531 and 535 were the first Tektronix scopes to accept plug-ins.
It was [[introduced in 1954|introduced in March 1954]] simultaneously with the Type 535, and [[introduced in 1959|superseded in 1959]] by the Type 531A,
It was [[introduced in 1954|introduced in March 1954]] simultaneously with the Type 535,
and [[introduced in 1959|superseded in 1959]] by the Type 531A,
which has more convenient controls and a slightly faster (15 MHz) vertical amplifier.
which has more convenient controls and a slightly faster (15 MHz) vertical amplifier.


531s with below S/N 7950 have DuMont [[154-081|5BGP2]] instead of Tektronix [[T533P2]].
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.


In serial numbers 101 to 7600, the 531's L-C [[delay line]] is before the vertical amplifier.
There is also a rack-mount version, Types RM31 and RM31A.
In serial numbers 7601 and up, the 531's delay line is between the vertical amplifier and the CRT. ''(What was the reason for this change?)''
They have a sliding chassis so that the scope can be serviced without removing it from a rack.


There is also a rack-mount 531A, Type RM31A. The RM31A has a sliding chassis so that the scope can be serviced without removing it from a rack.
The [[532]] is similar to the 531, but designed to be more reliable at the expense of slower risetime.
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.


The [[532]] is similar to the 531, but designed to be more reliable at the expense of slower risetime.  The [[541]] is mostly the same as the 531, but has a [[distributed amplifier|distributed vertical amplifier]] 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}}


==Specifications==
==Links==
{{Documents|Link=531}}
{{Documents|Link=531A}}


[[Category:Specifications needed]] ''please add''
==Pictures==
===531===
<gallery>
531_early_1.jpg        | early 531 with [[C|Type 53C]]
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>


==Pictures==
===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>
<gallery>
File:531_early_1.jpg        | early 531
rm31a.jpg              | RM31A
File:rm31a.jpg              | RM31A
File:Tek 531a on cart.JPG    | 531A on cart
File:Tek 531a 34 pr.jpg      | 531A
File:Tek 531a front.jpg      | 531A
File:Tek 531a right top.jpg  | 531A
File:Tek 531a right2.jpg    | 531A
File:Tek 531a right 3.jpg    | 531A
File:Tek 531a right.jpg      | 531A
File:Tek 531a left close.jpg | 531A
File:Tek 531a left.jpg      | 531A
File:Tek 531 brown 1.jpg | Brown-era 531 with [[CA|Type CA]]
File:Tek 531 brown 2.jpg | Brown-era 531 with [[CA|Type CA]]
File:Tek 531 brown 3.jpg | Brown-era 531 Rear
File:Tek 531a on cart.jpg|531A on cart
</gallery>
</gallery>
==Components==
{{Parts|531}}
{{Parts|531A}}
{{Parts|RM31A}}


[[Category:500 series scopes]]
[[Category:500 series scopes]]
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