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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, | ||
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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== |