7B15
The Tektronix 7B15 is a 1 GHz delaying time base for 7000-series scopes, in particular, the 1 GHz 7104 (typically used with 7A29 vertical amplifiers and a 7B10 delayed time base).
The 7B15 provides digital readout of delay and delta times. In effect, the 7B15/7B10 pair are speed-improved versions of the 7B85/7B80.
Key Specifications
| Sweep | 200 ms/Div to 2 ns/Div in 1−2−5 sequence, ×10 magnifier down to 200 ps/Div, variable to ×2.5 |
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| Triggering | to 1 GHz |
| Jitter | less than 30 ps at 1 GHz |
| Features |
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Internals
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. The control voltage is therefore proportional to the amount of delay and is measured using a 155-0185-00 4-digit DVM circuit, then displayed on the oscilloscope readout. The display, scaled in seconds, provides the operator with a precise readout of the delay.
Other custom Tek ICs used: 155-0150-00 trigger detector, 155-0160-00 trigger amplifier.
The 7B15 uses the +50 V supply provided by the mainframe.
Pictures
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7B15 front panel
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left side
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right side
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Family resemblance: 7B15 (top) vs. 7B85 (bottom). Left side.
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Family resemblance: 7B15 (top) vs. 7B85 (bottom). Right side.
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Custom ICs used in the 7B15
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0049-00 | M079G | 155-0049-00 • 155-0049-01 • 155-0049-02 | sweep control with lockout | Bill DeVey | 335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00 |
| 155-0149-00 | 155-0149-00 | 155-0149-00 | sweep control | 7B10 • 7B15 | |
| 155-0150-00 | H473 | 155-0150-00 | trigger detector | Walt Ainsworth • Art Metz | 7904A • 7104 • 7B10 • 7B15 • 7B92A • SCD1000 |
| 155-0160-00 | M136 | 155-0160-00 | 1.5 GHz trigger amplifier and source select | Art Metz | 7B10 • 7B15 • 067-0587-02 • 067-0587-10 |
| 155-0185-00 | M187 | 155-0185-00 | four-digit counter, latch and D/A converter/DVM | Don Larson | 7B15 • 7B85 • 7B87 |