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The Tektronix Type 531 is a 10MHz oscilloscope that accepts [[letter-series and 1-series plug-ins]].
{{Oscilloscope Sidebar |
title=Tektronix 531|
summary=10 MHz scope |
image=Tek 531a g front.jpg |
caption=Tektronix 531 |
introduced=1954 |
discontinued=1973 |
manuals=
* [http://bama.edebris.com/download/tek/531_541/531_541.djvu Tektronix 531/541 Manual (DjVu)]
* [http://w140.com/mmm/tek-531-541.pdf Tektronix 531/541 Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_531_factory_cal_proc.pdf Tektronix 531 Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_fcp/tek_type_531a_factory_cal_proc.pdf Tektronix 531A Factory Calibration Procedure (PDF)]
 
* [[Media:tek_531_fcp.pdf|Tektronix 531 Factory Calibration Procedure (PDF, OCR)]]
* [[Media:tek_531a_fcp.pdf|Tektronix 531A Factory Calibration Procedure (PDF, OCR)]]
}}
 
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.
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,  
It was [[introduced in 1954|introduced in March 1954]] simultaneously with the Type 535,
531 with below S/N 7950 have DuMount 5BGP2 instead of Tektronix T533P2.
and [[introduced in 1959|superseded in 1959]] by the Type 531A,
and [[introduced in 1959|superseded in 1959]] by the Type 531A,
which has more convenient controls and a slightly faster (15MHz) 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 [[T5330|T533P2]].
 
In serial numbers 101 to 7600, the 531's L-C [[delay line]] is before 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 output chassis.
All Tek scopes using a lumped-constant delay line went to 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. 


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.


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.


* [http://bama.edebris.com/download/tek/531_541/531_541.djvu Tektronix 531/541 Manual (DjVu)]
* [http://w140.com/mmm/tek-531-541.pdf Tektronix 531/541 Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_531_factory_cal_proc.pdf Tektronix 531 Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_fcp/tek_type_531a_factory_cal_proc.pdf Tektronix 531A Factory Calibration Procedure (PDF)]


{{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}}
{{Spec | Screen Area | 6 cm × 10 cm}}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Weight| 61,5 lbs / 27,8 kg }}
{{EndSpecs}}
==Pictures of  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 of  531A==
<gallery>
Tek 531a g front.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>
==Pictures of  RM31A==
<gallery>
<gallery>
Image:531_early_1.jpg|early 531
rm31a.jpg               | RM31A
Image:rm31a.jpg|RM31A
Image:Tek 531a on cart.JPG|531A on cart
</gallery>
</gallery>
[[Category:500 series scopes]]
Matt
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