1K-POT: Difference between revisions
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=1K Pot= |
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Some informations about the so called 1K-pot and the installed or mounted items ... |
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== Temperature Read-Out == |
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* Strange Heat Sink |
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function is not clear, also the wiring. There are to white textile tubes (marked with one respectively two black lines), each leading a twsited pair down to the MC. |
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* The temperature of the 1K Pot is read with a carbon resistor thermometer [[TT:Thermometry#Carbon Resistors|FT4]] by the [[TT:Thermometry#LR-700|LR-700]]. The carbon thermometer is mounted on top of the 1K Pot next to the pumping tube of the still leading through the pot. There is also a heater in the middle of 1K pot, but it is not know how to use this heater. |
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{| {{Prettytable}} |
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|+Tab.Resistance R<sub>1K</sub> of FT4 at certain temperatures. |
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! width="130px" |Temperature [K] |
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| width="90px" | 300 || width="90px" | 4.2 || width="90px" | 1.5 |
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! width="150px" |Resistance R<sub>1K</sub> [{{O}}] |
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|| 441 || 700 || 1450 |
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|} |
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== Technical Details == |
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[[Image:rearrange_2011_04.jpg|right|thumb|130px|Rearranged cables below the feedthrough.]] |
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* The 1K Pot has two filling capillaries. The filling via one can be controlled by a valve, the filling trough the second is permanently via a long impedance. |
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* Unknown function of a 47k{{O}} resistor mounted next to the still tube. Its connected to BOXI X10:3 and X10:4. |
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* April 2011: rearrange cables and wiring for the installation of SQUID-wires and HF-coax cables. |
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* Strange Heat Sink for Heat Switch (removed!!!) This is one of two former Heat Switches. They were connected with leads to the mixing chamber. The resistance of the heat switch was 1k{{O}}. The led-HS was connected to Pin Bar B, the other one to Pin Bar F(8|16). |
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Latest revision as of 16:22, 3 January 2012
1K Pot
Temperature Read-Out
- The temperature of the 1K Pot is read with a carbon resistor thermometer FT4 by the LR-700. The carbon thermometer is mounted on top of the 1K Pot next to the pumping tube of the still leading through the pot. There is also a heater in the middle of 1K pot, but it is not know how to use this heater.
| Temperature [K] | 300 | 4.2 | 1.5 |
|---|---|---|---|
| Resistance R1K [] | 441 | 700 | 1450 |
Technical Details
- The 1K Pot has two filling capillaries. The filling via one can be controlled by a valve, the filling trough the second is permanently via a long impedance.
- Unknown function of a 47k resistor mounted next to the still tube. Its connected to BOXI X10:3 and X10:4.
- April 2011: rearrange cables and wiring for the installation of SQUID-wires and HF-coax cables.
- Strange Heat Sink for Heat Switch (removed!!!) This is one of two former Heat Switches. They were connected with leads to the mixing chamber. The resistance of the heat switch was 1k. The led-HS was connected to Pin Bar B, the other one to Pin Bar F(8|16).
