View source for 5031

{{Oscilloscope Sidebar |
title=Tektronix R5031 |
summary=1 MHz, 10 μV dual-beam storage scope |
image=Tek-5031-front.jpg |
caption=Tektronix 5031 front view |
introduced=1969 |
discontinued=1972 |
manuals=
* [http://w140.com/tek_r5031.pdf Tektronix R5031 Manual (PDF)]
* [[File:Tek 5030 5031 from Catalog 1970.pdf|Models 5030/5031 in 1970 catalog (PDF, 8 pages)]]
}}
The '''Tektronix 5031''' is a dual-beam split-screen, bi-stable storage oscilloscope introduced in 1969 (no longer listed in the 1973 catalog).  There is a portable benchtop model, the 5031, and a rack-mount model, the R5031, as well as a sister model [[5030]]/R5030 without storage.  The 503x series are monolithic scopes (no plugins).

The 5030 and 5031 feature differential and current probe (for [[P6021]]) inputs on both channels.  Input ranges are similar to the contemporary [[3A9]] diff/current amplifier plugin but without the variable bandwidth and DC offset controls.  The horizontal deflection system is shared.

The 5031/5030 include a readout system which uses small lightbulb/fiber dot matrix displays external to the CRT, similar to that in the [[576]] curve tracer.  Only the first and last steps on the time/div and volts/div switches are labelled.

{{BeginSpecs}}
{{Spec | Bandwidth | DC to 1 MHz (5 kHz limit switchable) }}
{{Spec | Deflection | 10 μV/Div to 10 V/Div or 1 mA/Div to 200 mA/Div (1—2—5) }}
{{Spec | Noise | < 15 μV / 200 μA }}
{{Spec | Input impedance | 1 MΩ // 50 pF }}
{{Spec | Time base | 1 μs/Div to 5 s/Div (1—2—5), magnifier × 1, 2, 5, 10, 20, 50 (1 μs/Div max.)}}
{{Spec | CMRR | 100,000:1 to 100 kHz }}
{{Spec | X input | 20 mV/Div to 500 mV/Div on Ext Horizontal, or Channel 2 in X-Y mode}}
{{Spec | CRT | 8 × 10 Div @ 1.27 cm (0.5"), P31 phosphor }}
{{Spec | Acceleration | 4 kV }}
{{EndSpecs}}

==Links==
* http://www.eevblog.com/forum/testgear/vintage-tektronix-oscilloscope/

==Internals==

The channel-1 and channel-2 input attenuators use a rotary barrel cam that moves several small contact
arms to select the desired path through the attenuator networks.  

The design is similar to that seen in several 7000-series plug-ins.  
The front-end amplifier starts with a differential amplifier formed by 
both halves of a [[151-1027-00]] dual JFET, Q46, followed by a dual PNP.
The rest of the signal path comprises differential amplifiers made of discrete
BJTs, including the deflection amplifier, which uses [[SE7056]] transistors for
its output stage.

The 5031 makes extensive use of relays in the signal path.

The 5031 has -4.1 kV on the CRT cathode, and no post-deflection acceleration.  

==Pictures==

===5031===
<gallery>
File:Tek-5031-3q.jpg      | Tektronix 5031
File:Tek-5031-left.jpg    | Left view 
File:Tek-5031-right.jpg   | Right view 
File:Tek-5031-display1.jpg| Display detail (1)
File:Tek-5031-display2.jpg| Display detail (2)
File:Tek-5031-display3.jpg| Display detail (3)
File:Tek-5031-fiberoptic-readout.jpg | Detail of fiberoptic readout module
File:Tek-5031-bottom-1.jpg| Bottom view (1)
File:Tek-5031-bottom2.jpg | Bottom view (2)
File:Tek-5031-bottom3.jpg | Bottom view (3)
File:Tek-5031-and-tds2014.jpg | Tektronix 5031 and TDS2014
</gallery>

===R5031===
<gallery>
File:Tek r5031 1.jpg|R5031 Front
File:Tek r5031 2.jpg|R5031 Front Controls
File:Tek r5031 3.jpg|R5031 Rear
</gallery>

[[Category:5000 series scopes]]
[[Category:Analog storage scopes]]
[[Category:Dual beam scopes]]