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7B85: Difference between revisions
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<blockquote> | <blockquote> | ||
[[Les Larson]] developed the trigger circuitry and served as Project Manager for the 7B80 and 7B85. | [[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 | 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. | [[Gene Andrews]], Program Manager, provided overall direction for the project. | ||
</blockquote> | </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 40: | 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). A ramp generator is started when the trigger signal arrives. | The 7B85 uses a [[155-0185-00]] digital voltmeter IC (U686). | ||
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 control voltage, set by the front panel knobs on the 7B85. | 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. | ||
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 on the [[7000 series readout system|oscilloscope readout]], | 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. | ||
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== | ||