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S-2: Difference between revisions
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{{Spec | Rise time | 75 ps }} | {{Spec | Rise time | 75 ps }} | ||
{{Spec | Bandwidth | 4.66 GHz eq.}} | {{Spec | Bandwidth | 4.66 GHz eq.}} | ||
{{Spec | | {{Spec | Operating input voltage range | −1 V to +1 V with ≤1 V<sub>p-p</sub> signals }} | ||
{{Spec | Maximum single sample step | 200 mV}} | |||
{{Spec | Maximum input voltage | ±5 V<sub>DC</sub> or sine of 10 V<sub>p-p</sub> up to 10 MHz }} | |||
{{Spec | Input impedance | 50 Ω ±1% ([[GR-874]]) }} | |||
{{Spec | Noise | < 10 mV }} | |||
{{Spec | Features | trigger pickoff for internal triggering }} | |||
{{EndSpecs}} | {{EndSpecs}} | ||
==Similarity to [[S-1]]== | |||
The S-1 and S-2 samplers are constructed very similarly. The mechanical construction including internal connector locations is identical, and the preamp boards are almost identical. The main difference in these boards is the value of the gain adjust trimpot R46, which is 5k for the S-1 and 30k for the S-2, to allow higher gain settings to compensate for the shorter sampling pulses of the S-2. Bipolar transistors Q41 and Q45 are different types (why?). Preamp boards can be swapped between S-1s and S-2s for testing without issues. | |||
The strobe boards use identical active components ([[avalanche transistor]] Q69 [[153-0556-00]] and [[Snap-off diode]] D61 152-0335-00), but the board layout is different to accommodate longer strobe clipping lines in the S-1. | |||
The sampling circuit itself is almost identical, except that the dampening resistors R7B and R8B of the [[S-1]] are missing in the S-2. The [[sampling diodes]] are different, the S-2 uses a 152-0361-00 GaAs matched pair. | |||
==Repair issues== | ==Repair issues== | ||