Filter Box
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The filter board is sealed in a faraday cage (the filter box) and connects to the cryostat MDM connectors using a drive shaft. Each analog signal from the cryostat is filtered using a 150pF capacitor connected between the signal and the chassis or cryostat wall. The MCE uses 5 identical filter boards that attach directly to the cryostat wall.
Revision History
Filter Box Rev D to Rev E changes
Schematics
- Filter Board MCEv1 (S587-111) - 5 MDM RevB2 [PDF]
- Filter Board MCEv2 (C587-111) - 3 MDM RevA [PDF]
- Filter Board MCEv2 (C587-210) - 5 MDM RevA [PDF]
Notes
- 1k PCB capacitance
- Typical Readout sig/ret capacitive load = 16pF +/- 2pF
- Typical row_select sig/ret capacitive load = 23pF +/- 1pF
- (both measured at 100Hz, 1kHz, 10kHz, and 100kHz using a Wayne Kerr Automatic LCR meter (4250)
- Cryocable Impedance
-
- Bandwidth restriction caused by cable impedance in conjunction with the filter
- Assuming 100pf/200-Ohm cable and 150pf filter, the cable has a pole at: 3.2MHz
- Rdyn of SSA
- about few hundred ohms: 100 to 600 Ohm
- Filter box installation and maintenance notes
- see Connector Mating System Maintenance to adjust filter box drive shaft split rings
