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m (correct discontinuation year based on 1974-75 catalogs. Note: RM547 was discontinued in 1974.)
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title=Tektronix 547 |
title=Tektronix 547 |
summary=50 MHz scope |
summary=50 MHz scope |
image=Tek 547 1a2 new.jpg |
image=Tek 547 trace.jpg |
caption=Tektronix 547 with [[1A2]] plugin |
caption=Tektronix 547 with [[1A2]] plugin |
introduced=1964 |
introduced=1964 |
discontinued=1975 |
discontinued=1975 |
manuals=
manuals=
* [http://w140.com/mmm/tek-547.pdf Tektronix 547 Manual with 547 Notes (PDF, 128MB)]
* [http://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual (DjVu)]
* [http://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual (DjVu)]
* [http://w140.com/tek_547.pdf Tektronix 547 Manual (PDF)]
* [http://w140.com/tek_547.pdf Tektronix 547 Manual (PDF, 60MB)]
<!-- * [[Media:Tek 547 544 546 technical instruction and training.pdf|Tektronix 547, 546, and 544 Technical Instruction and Training (PDF, needs OCR)]] -->
 
* [[Media:070-0398-00.pdf|Tektronix 547 Manual (PDF, OCR, 60MB, bad-OCR)]]
* [[Media:Tek_547_544_546_tech_instr_and_training.pdf|Tektronix 547, 546, and 544 Technical Instruction and Training (PDF, OCR)]]
* [[Media:Tek 547 fcp.pdf|Tektronix 547 Factory Calibration Procedure]]
}}
}}
The '''Tektronix 547''' is a 50 MHz scope that takes [[letter-series and 1-series plug-ins]].   
The '''Tektronix 547''' is a 50 MHz scope that takes [[letter-series and 1-series plug-ins]].   
It has two identical timebases and,  
 
when used with the [[1A1]], [[1A2]], or [[1A4]],  
It has two identical timebases and, when used with the [[1A1]], [[1A2]], or [[1A4]],  
has the ability to display one input with one time scale and another input with a different time scale.   
has the ability to display one input with one time scale and another input with a different time scale.   
The effect is similar to a [[dual-beam scopes|dual-beam scope]]  
The effect is similar to a [[dual-beam scopes|dual-beam scope]]  
assuming that the input signals are repetitive.  
assuming that the input signals are repetitive.  
This "Sweep Switching" feature differentiates the 547 from the [[546]].
This "Sweep Switching" feature differentiates the 547 from the [[546]].
There is also a rackmount version, the RM547 or R547. 


The project lead for the development of the Tektronix [[544]], [[546]], and 547 was [[Bob Rullman]].
The project lead for the development of the Tektronix [[544]], [[546]], and 547 was [[Bob Rullman]].
{{MissingSpecs}}


==Internals==
==Internals==
Line 41: Line 51:
The usual solution is to scavenge a replacement transformer from another scope.
The usual solution is to scavenge a replacement transformer from another scope.
As a labor of love, hobbyists have been known to rebuild the HV transformers.
As a labor of love, hobbyists have been known to rebuild the HV transformers.
This is discussed from time to time on the Yahoo TekScopes forum.
This is discussed from time to time on the groups.io (formerly Yahoo) TekScopes forum.


===Vertical Amplifier===
===Vertical Amplifier===
The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in
The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in
connector to the CRT vertical deflection plates. There is one tube in the vertical signal path,
connector to the CRT vertical deflection plates.
There is one tube in the vertical signal path,
a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier.
a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier.


====Spoiler Switch====
The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's
vertical signal path when certain relatively modern plug-ins are used,
such as the [[1A1]], [[1A2]], [[1A4]], [[1L30]], and [[1L40]].
Those plug-ins have a small hole to the left of the plug-in to mainframe connector,
so they can be fully inserted without pressing the spoiler switch.
====Delay Line====
There is a 170 nanosecond [[delay line]] between the first and second gain stages.
There is a 170 nanosecond [[delay line]] between the first and second gain stages.
===Power Supply ===
The 547's power supply provides regulated outputs of −150 V, +100 V, +225 V, +350 V,
as well as a +325 V unregulated output for CRT HV section.
Multiple secondary windings feeds diodes for rectification for different voltages.
Both center-tap and bridge configuration is used. Its a all Tube design for the regulation.
There are multiple 6.3V secondary outputs for heaters,
many elevated to different voltage levels based on the section/tube its used for to keep the Heater-Cathode voltage level within limits.
As is common in many Tektronix scopes,
all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers.
Only the −150 V voltage is trimmed, its reference is a [[OG3]] VR tube.
A [[12AX7]] is used as the comparator and two [[6CW5]] in parallel are used as series pass tubes.
A [[6AU6]] is used as an error amplifier.
Most other power supply sections in the 547 replicate the same basic design,
except slight changes in tubes used − the +225 V and +100 V regulators employ a [[6080]] as the pass element, +350 uses a [[6CW5]].
The plate voltage delay circuit is similar to that found in many may other Teks of the same era.
A 6N030 delay tube (P/N 148-0021-00) controls a relay that switches plate supply voltages on only after the tubes are warmed up.
Heater voltage is applied to all tubes immediately when the power switch is turned on.


==Links==
==Links==


* [https://lazyelectrons.wordpress.com/2018/07/06/tektronix-547-oscilloscope-restoration 547 Restoration with video]
* Tek 547 in "Reading Jim Williams" blog: [http://readingjimwilliams.blogspot.com/2011/10/scope-sunday-13.html Scope Sunday 13] and [http://readingjimwilliams.blogspot.com/2012/02/vintage-scopes-are-better-part-1.html Vintage Scopes are Better, pt.1]
* Tek 547 in "Reading Jim Williams" blog: [http://readingjimwilliams.blogspot.com/2011/10/scope-sunday-13.html Scope Sunday 13] and [http://readingjimwilliams.blogspot.com/2012/02/vintage-scopes-are-better-part-1.html Vintage Scopes are Better, pt.1]
* "MightyOhm" blog: [http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ Jim Williams workbench]  
* "MightyOhm" blog: [http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ Jim Williams workbench]  
Line 59: Line 101:
* [http://www.ebay.com/gds/The-Tektronix-547-Oscilloscope-Magic-in-the-Box-/10000000000725321/g.html The Tektronix 547 Oscilloscope - Magic in the Box]
* [http://www.ebay.com/gds/The-Tektronix-547-Oscilloscope-Magic-in-the-Box-/10000000000725321/g.html The Tektronix 547 Oscilloscope - Magic in the Box]
* [http://www.thevalvepage.com/testeq/tek/547/547.htm J.Evans's 547 page]
* [http://www.thevalvepage.com/testeq/tek/547/547.htm J.Evans's 547 page]
==Common Problems==
* See [[547/Repairs]]


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 547 1a2 new.jpg
Tek 547 1a2 new.jpg
Image:Tek 547.jpg|Front view
Tek 547.jpg|Front view
Image:547_01.JPG|Top
547_01.JPG|Top
Image:547_02.JPG|Right
547_02.JPG|Right
Image:547_03.JPG|Left
547_03.JPG|Left
Image:Tek-547 vert amp2.png|Vertical amplifier
Tek-547 vert amp2.png|Vertical amplifier
Image:Tek-547-trigger a.png|Trigger A
Tek-547-trigger a.png|Trigger A
File:Tek rm547.jpg|RM547
Tek rm547.jpg|RM547
Tek 547 ampex front.jpg
Tek 547 ampex front.jpg
Tek 547 ampex right internal.jpg
Tek 547 ampex right internal.jpg
Line 77: Line 122:
Grey face 547.jpg|Gray 547
Grey face 547.jpg|Gray 547
Tek rm547 trace.jpg
Tek rm547 trace.jpg
Tektronix rm547.jpg
Tek 547 rear close.jpg
Tek 547 rear close.jpg
Tek 547 eng.jpg|547 serial "ENG B 23"
Tek 547 eng.jpg|547 serial "ENG B 23"
Tek 547 eng2.jpg|547 serial "ENG B 23"
Tek 547 eng2.jpg|547 serial "ENG B 23"
Tek 547 rear connections.jpg|rear connections
Tek 547 rear connections.jpg|rear connections
Tek_547_Vert_Amp.jpg | Tek 547 Vertical Amplifier
Tek_547_CRT1.jpg | Tek 547 CRT
Tek_547_CRT2.jpg | Tek 547 CRT Side View
Tek_547_CRT_Def_Plates1.jpg | Tek 547 CRT Deflection Plates & Assembly
Tek_547_CRT_Def_Plates2.jpg | Tek 547 CRT Electron Gun Assembly
Tek_547_UnderChassis-No-Transformer.jpg | Tek 547 Underside of Chassis. Main Transformer is Not Present.
Tek_547_Chassis_Without_CRT.jpg | Tek 547 Chassis Without CRT and Plug in
Tek_547_Screen.jpg |  Tek 547 Screen Scale
Tek_547_Top.jpg | Tek 547 Top
Tek_547_HVSection-NoCover.jpg | Tek 547 HV Section and [[5642]]HV Rectifier Tube (Cover removed)
Tek_547_Power-Transformer3.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer2.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer1.jpg  | Tek 547 Main Transformer
Tek_547_Tubes.jpg | Tek 547 Inside view with Power ON
Tek_547-TunnelDiodes-Trigger.jpg | Tunnel Diodes TD253 and TD3A in a Tek 547 Trigger and Sweep Section
Tek_547_4-Trace.jpg | 547 with 1A2 in ALT Sweep Mode
Tek_547_Delayed_Trig.jpg | 547 Delayed Trace
Tek_547_Transformer.jpg | 547 LV Transformer Connections
Tunnel_DIode_1D2_2.2mA.jpg | 2.2 mA Tunnel Diode in 547 Delay Pickoff
Tek_547_Inside_Tubes.jpg | Inside a Tek 547
Tek_547_Delayed_Trigger1.JPG | Tek 547 Delayed Trigger & ALT Sweep
Tek_547_Delayed_Trigger2.jpg | Tek 547 Delayed Trigger & ALT Sweep
Tek 547 trace two sine.jpg|547 trace
Tek 547 1a1 front.jpg|547 with [[1A1]]
</gallery>
</gallery>


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

Revision as of 16:00, 11 September 2019

Manuals – Specifications – Links – Pictures

The Tektronix 547 is a 50 MHz scope that takes letter-series and 1-series plug-ins.

It has two identical timebases and, when used with the 1A1, 1A2, or 1A4, has the ability to display one input with one time scale and another input with a different time scale. The effect is similar to a dual-beam scope assuming that the input signals are repetitive. This "Sweep Switching" feature differentiates the 547 from the 546.

There is also a rackmount version, the RM547 or R547.

The project lead for the development of the Tektronix 544, 546, and 547 was Bob Rullman.

Key Specifications

  • please add

Internals

Triggering

Triggering is done with tunnel diodes. The 'A' trigger is based on a 10 mA tunnel diode. Up to serial number 11889, it uses a TD253. From 11890 onward, it uses a 152-0140-01.

CRT

The 547 uses the Tektronix 154-0478-00 CRT.

HV Transformer

A common problem with 547s is the HV transformer. Rather than potting the HV transformer in wax, as was done up to that point, the 547's HV transformer was potted in epoxy. Unfortunately, this epoxy turned out to absorb moisture over time, particularly when used in humid climates. The moisture causes increased losses in the transformer. Excessive losses require the regulator to drive the 6AU5 input oscillator tube (V800) harder. Eventually, the drive circuit cannot supply enough power to keep the supply in regulation. The usual solution is to scavenge a replacement transformer from another scope. As a labor of love, hobbyists have been known to rebuild the HV transformers. This is discussed from time to time on the groups.io (formerly Yahoo) TekScopes forum.

Vertical Amplifier

The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in connector to the CRT vertical deflection plates. There is one tube in the vertical signal path, a 12AT7 acting as a unity-gain buffer between the plug-in connector and the vertical amplifier.

Spoiler Switch

The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's vertical signal path when certain relatively modern plug-ins are used, such as the 1A1, 1A2, 1A4, 1L30, and 1L40. Those plug-ins have a small hole to the left of the plug-in to mainframe connector, so they can be fully inserted without pressing the spoiler switch.

Delay Line

There is a 170 nanosecond delay line between the first and second gain stages.

Power Supply

The 547's power supply provides regulated outputs of −150 V, +100 V, +225 V, +350 V, as well as a +325 V unregulated output for CRT HV section.

Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used. Its a all Tube design for the regulation. There are multiple 6.3V secondary outputs for heaters, many elevated to different voltage levels based on the section/tube its used for to keep the Heater-Cathode voltage level within limits.

As is common in many Tektronix scopes, all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers. Only the −150 V voltage is trimmed, its reference is a OG3 VR tube. A 12AX7 is used as the comparator and two 6CW5 in parallel are used as series pass tubes. A 6AU6 is used as an error amplifier. Most other power supply sections in the 547 replicate the same basic design, except slight changes in tubes used − the +225 V and +100 V regulators employ a 6080 as the pass element, +350 uses a 6CW5.

The plate voltage delay circuit is similar to that found in many may other Teks of the same era. A 6N030 delay tube (P/N 148-0021-00) controls a relay that switches plate supply voltages on only after the tubes are warmed up. Heater voltage is applied to all tubes immediately when the power switch is turned on.

Links

Common Problems

Pictures