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7B92: Difference between revisions
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Hf sync mode
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(Hf sync mode) |
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* [http://w140.com/smb/7b92a_sm.pdf Tektronix 7B92A Service Manual (OCR, PDF)] | * [http://w140.com/smb/7b92a_sm.pdf Tektronix 7B92A Service Manual (OCR, PDF)] | ||
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The Tektronix 7B92 is a 500 MHz timebase plug-in for [[7000-series scopes]]. | The Tektronix 7B92 is a 500 MHz dual timebase plug-in for [[7000-series scopes]]. | ||
It was introduced along with the [[7904]] mainframe in 1972. | |||
An "HF Sync" triggering mode is provided in which the trigger level | |||
control varies the frequency of a built-in oscillator to lock on to the input | |||
for input signals from 100 to 500 MHz, providing higher sensitivity than the | |||
direct trigger (which is specified up to 500 MHz as well). | |||
Internal jumpers are provided to configure the 7B92 for operation in 7800/7900 vs. slower mainframes, | |||
and to select whether the variable control affects the delaying or the delayed time base. | |||
==Specifications== | ==Specifications== | ||
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{{Spec | Ext Trig input | 1 MΩ // 20 pF or 50 Ω }} | {{Spec | Ext Trig input | 1 MΩ // 20 pF or 50 Ω }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Internals== | |||
The 7B92 uses a discrete trigger circuit containing [[tunnel diodes]]. | |||
Up to serial number B069999, the 7B92A used a discrete trigger circuit. | |||
After that, the 7B92A used a [[155-0061-00]] trigger amplifier followed by a | |||
[[155-0150-00]] trigger detector. | |||
==Pictures== | ==Pictures== | ||