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7B85: Difference between revisions
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|series=7000-series scopes | |series=7000-series scopes | ||
|type=7B85 | |type=7B85 | ||
|summary=400 MHz | |summary=400 MHz delaying timebase | ||
|image=Tek 7b85 front.jpg | |image=Tek 7b85 front.jpg | ||
|caption=Tektronix 7B85 Delaying Timebase plug-in | |caption=Tektronix 7B85 Delaying Timebase plug-in | ||
|introduced=1976 | |introduced=1976 | ||
|discontinued=1990 | |discontinued=1990 | ||
|designers=Art Metz | |designers=Les Larson;Bruce Hofer;Paul Farley;Art Metz; | ||
|manuals= | |manuals= | ||
* [[Media:070-1960-00.pdf|7B85 Operator's Manual]] (OCR) | * [[Media:070-1960-00.pdf|7B85 Operator's Manual]] (OCR) | ||
| Line 15: | Line 15: | ||
<small> | <small> | ||
* [ | * [https://bama.edebris.com/download/tek/7b85/Tektronix-7B85%20Delaying%20Time%20Base.pdf 070-1961-01 Alternate copy @ BAMA] | ||
</small> | </small> | ||
}} | }} | ||
| Line 23: | Line 23: | ||
The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no digital delay read-out. For the [[7104]] 1 GHz-class scopes, the [[7B15]]/[[7B10]] provide the functionality of 7B85/7B80. | The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no digital delay read-out. For the [[7104]] 1 GHz-class scopes, the [[7B15]]/[[7B10]] provide the functionality of 7B85/7B80. | ||
From Tekscope Vol.8 No.1, 1976: | |||
<blockquote> | |||
[[Les Larson]] developed the trigger circuitry and served as Project Manager for the 7B80 and 7B85. | |||
The sweeps were designed by [[Bruce Hofer]] and the DVM and related logic by [[Paul Farley]]. Much credit is due [[Art Metz]] for his work on the trigger input IC which includes the peak-to-peak automatic trigger circuitry. | |||
[[Gene Andrews]], Program Manager, provided overall direction for the project. | |||
</blockquote> | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Sweep | 5 s/ | {{Spec | Sweep | 5 s/div to 10 ns/iv in 1−2−5 sequence, ×10 magnifier down to 1 ns/div, variable to ×2.5}} | ||
{{Spec |Triggering | to 400 MHz }} | {{Spec |Triggering | to 400 MHz }} | ||
{{Spec | Features | | {{Spec | Features | | ||
| Line 33: | Line 40: | ||
}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | |||
* [[Patent US 4109182A]], ''Delayed sweep system for an oscilloscope''. | |||
* [https://m.youtube.com/watch?v=Hz-gF_XSj9w Demonstration of delay and delta time measurement on a 7B85] | |||
{{Documents|Link=7B85}} | |||
==Internals== | ==Internals== | ||
The 7B85 uses a [[155-0185-00]] digital voltmeter IC (U686). | The 7B85 uses a [[155-0185-00]] digital voltmeter IC (U686). | ||
A ramp generator is started when the trigger signal arrives. | A ramp generator is started when the trigger signal arrives. | ||
The delayed sweep is started when a comparator detects that the ramp has reached a | The delayed sweep is started when a comparator detects that the ramp has reached a control voltage, set by the front panel knobs on the 7B85. | ||
control voltage, set by the front panel knobs on the 7B85. | |||
The control voltage is proportional to the amount of delay. | The control voltage is proportional to the amount of delay. | ||
The digital voltmeter in the 7B85 digitizes the control voltage and displays it | The digital voltmeter in the 7B85 digitizes the control voltage and displays it on the [[7000 series readout system|oscilloscope readout]], thereby providing the operator with a precise readout of the delay. | ||
on the [[7000 series readout system|oscilloscope readout]], thereby providing the | |||
operator with a precise readout of the delay. | |||
Another way of setting up a precisely delayed timebase is to use a [[7D11]] digital delay module | Another way of setting up a precisely delayed timebase is to use a [[7D11]] digital delay module. | ||
The 7B85 uses the +50 V supply provided by the mainframe. | The 7B85 uses the +50 V supply provided by the mainframe. | ||
==Prices== | ==Prices== | ||
| Line 71: | Line 75: | ||
|align=right| $2,400 | |align=right| $2,400 | ||
|- | |- | ||
! In | ! In 2023 Dollars | ||
|align=right| $4, | |align=right| $4,500 | ||
|align=right| $4,500 | |align=right| $4,500 | ||
|align=right| $ | |align=right| $5,000 | ||
|align=right| $5, | |align=right| $5,200 | ||
|align=right| $5,600 | |||
|- | |- | ||
|} | |} | ||
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</gallery> | </gallery> | ||
{{ | ==Components== | ||
{{Parts|7B85}} | |||
[[Category:7000 series horizontal plugins]] | [[Category:7000 series horizontal plugins]] | ||