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7B85: Difference between revisions
some specs
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The Tektronix 7B85 is a 400 MHz delaying timebase for [[7000-series scopes]], typically the 7800 Series, e.g. [[7844]]. | The '''Tektronix 7B85''' is a 400 MHz delaying timebase for [[7000-series scopes]], typically the 7800 Series, e.g. [[7844]]. | ||
The trigger circuit is similar to that of the [[7B80]]. | The trigger circuit is similar to that of the [[7B80]]. | ||
The digital delay differentiates the 7B85 from the [[7B80]]. The [[7B87]] is similar to the 7B85 but provides | The digital delay differentiates the 7B85 from the [[7B80]]. The [[7B87]] is similar to the 7B85 but provides | ||
an acquisition clock for a digital storage mainframe instead of a delay. | an acquisition clock for a digital storage mainframe instead of a delay. | ||
==Specifications== | |||
{{BeginSpecs}} | |||
{{Spec | Sweep | 1 ns to 5 s/div }} | |||
{{Spec |Triggering | to 400 MHz }} | |||
{{Spec | Features | | |||
* Variable Trigger Holdoff | |||
* Peak-to-peak Auto Triggering | |||
}} | |||
{{EndSpecs}} | |||
==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. | ||
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Another way of setting up a precisely delayed timebase is to use a [[7D11]] digital delay module, or even a time mark generator such as the [[180A]], [[181]], [[184]], or [[2901]]. | Another way of setting up a precisely delayed timebase is to use a [[7D11]] digital delay module, or even a time mark generator such as the [[180A]], [[181]], [[184]], or [[2901]]. | ||
==Pictures== | ==Pictures== | ||