7B15

Manuals – Specifications – Links – Pictures

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
Triggering	to 1 GHz
Jitter	less than 30 ps at 1 GHz
Features	Digital read-out of delay and delta times Variable Trigger Holdoff HF Sync mode

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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