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7S14: Difference between revisions
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The 7S14 contains two samplers, trigger and sweep circuitry, and circuitry to interface it with the 7000-series mainframe in which it operates. The mainframe provides the 7S14 with power. The 7S14 sends the mainframe horizontal, vertical and readout signals. | The 7S14 contains two samplers, trigger and sweep circuitry, and circuitry to interface it with the 7000-series mainframe in which it operates. The mainframe provides the 7S14 with power. The 7S14 sends the mainframe horizontal, vertical and readout signals. | ||
The 7S14 has an integrated delay measurement function. | The 7S14 has an integrated delay measurement function. | ||
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somewhere between 16.5 MHz and 25 MHz. | somewhere between 16.5 MHz and 25 MHz. | ||
The sampler used by the 7S14 is a two-diode design. | The sampler used by the 7S14 is a two-diode design. Each of the two input channels has its own sampler. | ||
Each of the two input channels has its own sampler. | |||
==Repair issues== | |||
There are two 1.35 V mercury button cells, BT1 and BT2, in each of the sampler circuits. | |||
They act as floating bias sources, so if a 7S14 stops working it may be not defective, | |||
just the batteries are likely to be dead. First check the voltage on the cells. | |||
The original mercury cells can be replaced with other (less toxic) methods of | |||
bias voltage generation. Two obvious solutions are photovoltaic cells or modern batteries. | |||
The issue has been discussed extensively on the Yahoo TekScopes forum, so search the archives | |||
there for more information. Notably, Ed Breya posted [[7S14_repair|detailed notes on the 7S14 bias cell issue]]. | |||
==Links== | ==Links== | ||