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7B92 (view source)

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The 7B92 uses a discrete trigger circuit containing [[152-0177-02]] [[tunnel diodes]].
The 7B92 uses a discrete trigger circuit containing [[152-0177-02]] [[tunnel diodes]].


[https://vintagetek.org/years-at-tektronix-hofer/ According to Bruce Hofer],
[https://vintagetek.org/years-at-tektronix-hofer/ Bruce Hofer recalls] investigating an issue where
early 7B92 models exhibited sweep anomalies especially near the start of the sweep,
early 7B92 models exhibited sweep anomalies especially near the start of the sweep.
and after trying to fix these he convinced management that a redesign was needed.   
After trying to fix these he convinced management that a redesign was needed.   
This resulted in [[Patent US 4009399A]], the [[7B92A]] update, and the [[067-0657-00]] calibration fixture.  
This resulted in [[Patent US 4009399A]], the [[7B92A]] update, and the [[067-0657-00]] calibration fixture.  


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The effect of this jumper is only noticeable for sweep speeds of 20 μs/Div and faster,  
The effect of this jumper is only noticeable for sweep speeds of 20 μs/Div and faster,  
since at those sweep speeds the smallest shunt capacitance is used on pin 8, and the holdoff time is minimal.
since at those sweep speeds the smallest shunt capacitance is used on pin 8, and the holdoff time is minimal.
==Links==
* [https://www.youtube.com/watch?v=uBeYAcD7Dds Zenwizard Studios - Tektronix 7B92A Calibration and Checkin]
* [[Bruce Hofer]], ''[https://vintagetek.org/years-at-tektronix-hofer/ My Years at Tektronix]
* [[Patent_US_4009399A| US Patent 4009399 Gated Ramp Generator]]


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 7b92 front.jpg    | 7B92 front
Tek 7b92 front.jpg    | 7B92 front
Tek 7b92 right.jpg    | 7B92 right
Tek 7b92 right.jpg    | 7B92 right
Tek 7b92 left.jpg    | 7B92 left
Tek 7b92 left.jpg    | 7B92 left
7b92a-front.jpg      | 7B92A front
Tek 7b92a front2.jpg  | 7B92A
Tek 7b92a right.jpg  | 7B92A right (late S/N, [[Hypcon]]-packaged [[155-0150-00]] trigger detector circuits)
Tek 7b92a left.jpg    | 7B92A left (late S/N)
Tek 7b92a block.png  | 7B92A block diagram
7b92a-triggering-974mhz.jpg          | A 7B92A (B098xxx) triggering a 974 MHz sine applied to a [[7904]] mainframe via a 067-0587-02 calibration fixture (maximum triggerable frequency for this specimen).
Tek7904-7a19-7b92a-1010mhz-hfsync.jpg | A 7B92A (B098xxx) displaying a 1.01 GHz sine in HF Sync mode on a [[7904]] mainframe via a [[7A19]] amplifier (maximum signal generator frequency).
</gallery>
</gallery>


{{Custom ICs|7B92A}}
{{Custom ICs|7B92}}


[[Category:7000 series horizontal plugins]]
[[Category:7000 series horizontal plugins]]
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