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=== Delayed Pulse Generator === | === Delayed Pulse Generator === | ||
The delayed pulse generator is a [[tunnel diodes|tunnel diode]] circuit that produces a negative-going 250 mV pulse with a risetime of about 150 ps and a pulse width of about 400 ns. | The delayed pulse generator is a [[tunnel diodes|tunnel diode]] circuit that produces a negative-going 250 mV pulse | ||
with a risetime of about 150 ps and a pulse width of about 400 ns. | |||
The output is a 50 Ω [[GR-874 connector]]. | |||
When a timing unit (e.g., a 5T1) triggers, it sends a pulse through pin 10 of the J4 interconnect to the delayed pulse generator, which regenerates the pulse. | When a timing unit (e.g., a 5T1) triggers, it sends a pulse through pin 10 of the J4 interconnect to the delayed pulse generator, which regenerates the pulse. | ||
There are three versions of the 661 delayed pulse generator (serial numbers 101 through 2829, 2830 through 3459, 3460 and up). | There are three versions of the 661 delayed pulse generator (serial numbers 101 through 2829, 2830 through 3459, 3460 and up). | ||
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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 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?'' | :''Why is it that the 661 has a dedicated 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?'' | |||
Some 661s have a 41 pin [[Bendix connector]] on the rear panel, perhaps to allow the 661 to be interfaced to low speed data acquisition equipment or a computer. | Some 661s have a 41 pin [[Bendix connector]], J5, on the rear panel, perhaps to allow the 661 to be interfaced to low speed data acquisition equipment or a computer. | ||
This is essentially a pass-through from J2 & J3, the secondary multi-pin connectors on the vertical & horizontal plug-ins. | |||
These connectors carry switch position information (number, magnitude & units) and clock & gate pulses. | |||
Not all plug-ins had this 2nd connector; the [[5T1A]] does, while the [[5T3]] does not. | |||
The 661 has a 137°F/58 °C [[thermal cutoff]]. In practice, it doesn't run hot. | The 661 has a 137°F/58 °C [[thermal cutoff]]. In practice, it doesn't run hot. | ||