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The 551 is a dual-beam scope that takes two letter-series | {{Oscilloscope Sidebar | | ||
title=Tektronix 551 | | |||
summary=27 MHz scope | | |||
image=551 front.jpg | | |||
caption=Tektronix 551 | | |||
introduced=1958 | | |||
discontinued=1973 | | |||
manuals= | |||
* [http://bama.edebris.com/download/tek/551/Tek%20551.pdf Tektronix 551 Manual (PDF)] | |||
* [[Media:070-245.pdf|Tektronix 551 Manual (PDF, OCR, bad-OCR)]] | |||
* [http://www.wellenkino.de/551 Martin Mehlhose's 551 Page] | |||
<!-- * [http://w140.com/tek_fcp/tek_551_fac_cal.pdf Tektronix 551 Factory Calibration Procedure (PDF)] --> | |||
* [[Media:tek_551_fcp.pdf|Tektronix 551 Factory Calibration Procedure, January 1959 (PDF, OCR)]] | |||
* [[Media:Tek 551 fcp sep 1967.pdf|Tektronix 551 Factory Calibration Procedure, September 1967]] | |||
}} | |||
The '''Tektronix Type 551''', [[introduced in 1958]], | |||
is a 27 MHz [[dual-beam scopes|dual-beam scope]] that takes | |||
two [[letter-series and 1-series plug-ins]]. | |||
A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage | Unlike the [[555]], it has only one set of horizontal deflection plates and | ||
the trigger and sweep circuitry are built in to the mainframe. | |||
The vertical amplifiers of the [[545|545A]], 551, and 555 are identical. | |||
The 551 uses an L-C [[delay line]] for each vertical channel. | |||
Like the 555, the 551 has two parts: | |||
the "indicator unit" containing the signal path electronics and CRT, | |||
and an external power supply unit. | |||
The filament current for the tubes in the indicator unit is produced by a transformer in the indicator unit, | |||
T750 (part number [[120-235]]) that has seven isolated secondaries, each supplying 6.3 V<sub>AC</sub>. | |||
The indicator unit also contains the CRT circuit, which uses [[5642]] tubes and produces the +8650 V CRT anode voltage | |||
and the −1350 V voltage for the CRT cathode. | |||
The external power supply unit produces regulated DC voltages of −150 V, +100 V, +225 V, +350 V, and +500 V. | |||
The external power supplies of the 555 and 551 are not interchangeable. | |||
However, the cable that connects the power supply to the indicator unit (part number [[012-032]]) is the same for the 551 and the 555. | |||
A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV | |||
to improve trace visibility at high sweep rates, at the cost of reducing deflection sensitivity to 0.85 cm/Div. | |||
A graticule with 0.85 cm units was supplied. | |||
Early 551 units used [[UHF connector]]s. Many were converted in the field to use [[BNC connector]]s. | |||
{{BeginSpecs}} | |||
{{Spec | CRT | [[T57]] (T551) in early, [[T5511]] in later (SN 2032+) models }} | |||
{{EndSpecs}} | |||
{| class="wikitable" style="text-align: center;" | |||
|+Comparison of 551 with 555 | |||
! scope="col" | | |||
! scope="col" | 551 | |||
! scope="col" | 555 | |||
|- | |||
! scope="col" | Rise time with Type K | |||
| 14 ns | |||
| 12 ns | |||
|- | |||
! scope="col" | Acceleration Voltage | |||
| 10 kV | |||
| 10 kV | |||
|- | |||
! scope="col" | Filament Regulation | |||
| none | |||
| saturable core reactor | |||
|- | |||
! scope="row" | Price in 1965 <br />(2015 equiv.) | |||
| $1,850 <br />($14,000) || $2,650 <br />($20,100) | |||
|- | |||
! scope="row" | Indicator Weight | |||
| 52 lb (23.6 kg) | |||
| 68 lb (30.8 kg) | |||
|- | |||
! scope="row" | Power Supply Weight | |||
| 42 lb (19 kg) | |||
| 45 lb (20.4 kg) | |||
|- | |||
! scope="row" | Power Consumption | |||
| 850 W | |||
| 1050 W | |||
|} | |||
==Links== | |||
* [https://youtube.com/watch?v=npCHu9Shwsk Tektronix 551: A Gift from the Nuclear Energy Research Lab] @ YouTube | |||
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/551.html Tek 551 @ amplifier.cd] | |||
==Pictures== | |||
<gallery> | |||
551_front.jpg|Front view | |||
551_ps.jpg|External power supply | |||
551_leftint.jpg|Left side. | |||
551_rightint.jpg|Right side. | |||
551_top.jpg|Top view. | |||
551_PC_Front.jpg|front view. | |||
551_PC_Front-close.jpg|front view closeup. | |||
551_PC_Left.jpg|Left side. | |||
551_PC_Right.jpg|Right side. | |||
551_PC_Bottom.jpg|Bottom. | |||
551_PC_lower-amp.jpg|lower beam distributed amplifier. | |||
551_PC_Timebase.jpg|Timebase & calibration adjustments. | |||
551 block.gif|Block diagram | |||
551 vert.gif|Vertical amplifier | |||
Tek 551 trigger.png|trigger schematic | |||
Tek 551 high voltage section.png|CRT circuit | |||
Tek 551 block.png|block diagram | |||
Tek 551 ps bottom.jpg|bottom of power supply | |||
1-551 001.jpg|Tek 551 Mod 108A | |||
1-551 004.jpg|551 with Mod 108A | |||
Wellenkino 551.jpg | |||
Tek 551 2953 1.jpg | |||
Tek 551 2953 2.jpg | |||
Tek 551 2953 3.jpg | |||
Tek 551 2953 4.jpg | |||
Tek 551 2953 5.jpg | |||
Tek 551 2953 6.jpg | |||
Tek 551 2953 7.jpg | |||
Tek 551 2953 8.jpg | |||
Tek 551 2953 9.jpg | |||
Tek 551 2953 10.jpg | |||
Tek 551 2953 11.jpg | |||
Tek 551 ps1.jpg|power supply | |||
Tek 551 ps2.jpg|power supply | |||
</gallery> | |||
[[Category:500 series scopes]] | |||
[[Category:Dual beam scopes]] |