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661: Difference between revisions
→Delayed Pulse Generator
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=== Delayed Pulse Generator === | === Delayed Pulse Generator === | ||
The delayed pulse generator is a [[tunnel diodes|tunnel diode]] circuit | The delayed pulse generator is | ||
that produces a negative-going 250mV pulse with a risetime of about 150 ps | a [[tunnel diodes|tunnel diode]] circuit | ||
that produces a negative-going 250mV pulse | |||
with a risetime of about 150 ps | |||
and a pulse width of about 400 ns. | and a pulse width of about 400 ns. | ||
The output is 50-ohm GR-874. | The output is 50-ohm GR-874. | ||
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The second version is in serial numbers 2830 through 3459. | The second version is in serial numbers 2830 through 3459. | ||
The third version is in serial numbers 3460 and up. | The third version is in serial numbers 3460 and up. | ||
All three versions use a 50mA tunnel diode to generate the | All three versions use a 50mA tunnel diode | ||
actual output pulse. The circuit versions differ in how they | to generate the actual output pulse. | ||
The circuit versions differ in how they | |||
bias and trip the output tunnel diode. | bias and trip the output tunnel diode. | ||
Based on the available schematics, the 661 appears to have been designed in 1961. | Based on the available schematics, | ||
the 661 appears to have been designed in 1961. | |||
During what years was it manufactured? | During what years was it manufactured? | ||
Why is it that the 661 has a dedicated high-speed coaxial interface between | Why is it that the 661 has a dedicated | ||
the sampling unit the timing unit while later 560-series sampling systems ([[3S2]], [[3T77A]], etc.) | high-speed coaxial interface between | ||
the sampling unit the timing unit while | |||
later 560-series sampling systems ([[3S2]], [[3T77A]], etc.) | |||
simply use the regular plug-in connector | |||
and mainframe wiring harness | |||
for routing trigger and timing signals between the two units? | for routing trigger and timing signals between the two units? | ||
Some 661s have a | Some 661s have a multi-pin connector on the rear panel, | ||
perhaps to allow the 661 to be interfaced to low speed data acquisition equipment | perhaps to allow the 661 to be interfaced to low speed | ||
data acquisition equipment | |||
or a computer. | or a computer. | ||