547: Difference between revisions
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The 547 is a | {{Oscilloscope Sidebar | | ||
It has two identical timebases and , when used with the [[1A1]], [[1A2]], or [[1A4]], has the ability | title=Tektronix 547 | | ||
to display one input with one time scale | summary=50 MHz scope | | ||
and another input with a different time scale. | image=Tek 547.jpg | | ||
The effect is similar to a [[dual-beam scopes|dual-beam scope]] assuming that | caption=Tektronix 547 with [[1A1]] plugin | | ||
the input signals are repetitive. | years=? - ? | | ||
This "Sweep Switching" feature differentiates the 547 from the [[546]]. | manuals= | ||
* [http://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual (DjVu)] | |||
* [http://w140.com/tek_547.pdf Tektronix 547 Manual (PDF)] | |||
}} | |||
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 scopes|dual-beam scope]] assuming that the input signals are repetitive. This "Sweep Switching" feature differentiates the 547 from the [[546]]. | |||
== Triggering == | ==Internals== | ||
===Triggering=== | |||
Triggering is done with [[tunnel diodes]]. | Triggering is done with [[tunnel diodes]]. | ||
The 'A' trigger is based on a | The 'A' trigger is based on a 10 mA tunnel diode. | ||
Up to serial number 11889, it uses a [[TD253]]. | Up to serial number 11889, it uses a [[TD253]]. | ||
From 11890 onward, it uses a [[152-0140-01]]. | From 11890 onward, it uses a [[152-0140-01]]. | ||
== CRT == | ===CRT=== | ||
The 547 uses the Tektronix [[154-0478-00]] CRT. | The 547 uses the Tektronix [[154-0478-00]] CRT. | ||
== HV Transformer == | ===HV Transformer=== | ||
A common problem with 547s is the [[hv_transformer|HV transformer]]. | A common problem with 547s is the [[hv_transformer|HV transformer]]. | ||
Rather than potting the HV transformer in wax, | Rather than potting the HV transformer in wax, as was done up to that point, | ||
as was done up to that point, | |||
the 547's HV transformer was potted in epoxy. | the 547's HV transformer was potted in epoxy. | ||
Unfortunately, this epoxy turned out to absorb moisture over time, | Unfortunately, this epoxy turned out to absorb moisture over time, | ||
| Line 30: | Line 36: | ||
This is discussed from time to time on the Yahoo TekScopes forum. | This is discussed from time to time on the 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, | ||
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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. | ||
==Links== | ==Links== | ||
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* http://readingjimwilliams.blogspot.co.at/2012/02/vintage-scopes-are-better-part-1.html | * http://readingjimwilliams.blogspot.co.at/2012/02/vintage-scopes-are-better-part-1.html | ||
* http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ | * http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ | ||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/547.htm Tek 547 page @ amplifier.cd] | |||
==Pictures== | ==Pictures== | ||
Revision as of 06:22, 5 July 2014
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.
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 increases losses in the transformer. Excessive losses requires the regulator to drive the 6AU5 input oscillator tube (V800) harder. Eventually, the drive circuit can not 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 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.
There is a 170 nanosecond delay line between the first and second gain stages.
Links
- http://readingjimwilliams.blogspot.co.at/2012/02/vintage-scopes-are-better-part-1.html
- http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/
- Tek 547 page @ amplifier.cd
Pictures
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Front view
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Top
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Right
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Left
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Vertical amplifier
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Trigger A
