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{{Plugin Sidebar 2 | | |||
title=Tektronix 7B92 | | |||
summary=500 MHz Dual Timebase | | |||
image=7b92a-front.jpg | | |||
caption=7B92A front | | |||
introduced=1971 | | |||
discontinued=1992 | | |||
series=[[7000-series scopes]] | | |||
manuals= | |||
* [http://bama.edebris.com/download/tek/7b92a-2/tek-7b92a.pdf Tektronix 7B92A Manual (PDF)] | * [http://bama.edebris.com/download/tek/7b92a-2/tek-7b92a.pdf Tektronix 7B92A Manual (PDF)] | ||
* [http://w140.com/smb/7b92_sup_sm.pdf Tektronix 7B92 Circuit Description Supplement (OCR, PDF)] | * [http://w140.com/smb/7b92_sup_sm.pdf Tektronix 7B92 Circuit Description Supplement (OCR, PDF)] | ||
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* [http://w140.com/smb/7b92a_op_sm.pdf Tektronix 7B92A Operators Manual (OCR, PDF)] | * [http://w140.com/smb/7b92a_op_sm.pdf Tektronix 7B92A Operators Manual (OCR, PDF)] | ||
* [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)] | ||
}} | |||
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. In 1976, it was updated as the 7B92A. | |||
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. | |||
As a dual time base, the 7B92 uses the top field in the [[7000 series readout system|display readout]] | |||
for the sweep speed of the main and the bottom field for the delayed time base. The delay time | |||
can only be read from the 10-turn analog dial. | |||
The 7B92 has no magnifier function but its regular sweep dial setting reaches down to 500 ps/Div. | |||
It also has no provision for X-Y operation. | |||
{{BeginSpecs}} | |||
{{Spec | Sweep speed | 0.5 ns/Div to 0.2 s/Div, 1—2—5 sequence (variable up to 0.5 s/Div)}} | |||
{{Spec | Delay time | 0 to 9.9 Div }} | |||
{{Spec | Triggering | 0.5 Div or 100 mV up to 20 MHz, 1 Div or 500 mV up to 600 MHz }} | |||
{{Spec | Jitter | < 50 ps at 600 MHz }} | |||
{{Spec | Ext Trig input | 1 MΩ // 20 pF or 50 Ω }} | |||
{{EndSpecs}} | |||
==Internals== | |||
The 7B92 uses a discrete trigger circuit containing [[tunnel diodes]]. | |||
Up to serial number B069999, the 7B92A used a trigger circuit with [[155-0061-00]] amplifiers and tunnel diodes. | |||
After that, the 7B92A used a [[155-0061-00]] trigger amplifier followed by a [[155-0150-00]] trigger detector. | |||
The 7B92A uses one other custom IC, the [[155-0049-00|155-0049-xx]] sweep control circuit. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek 7b92 front.jpg | 7B92 front | |||
Tek 7b92 right.jpg | 7B92 right | |||
Tek 7b92 left.jpg | 7B92 left | |||
7b92a-front.jpg | 7B92A front | |||
Tek 7b92a front2.jpg| 7B92A | |||
Tek 7b92a right.jpg | 7B92A right | |||
Tek 7b92a left.jpg | 7B92A left | |||
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> | ||
[[Category:7000 series horizontal plugins]] |