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Entry  Tue Apr 12 18:42:59 2011, Dmass, tara, DailyProgress, TempCtrl, time constant between can and cavity Slide1.png
    Reply  Tue Apr 12 20:54:36 2011, Dmass, DailyProgress, TempCtrl, time constant between can and cavity 
       Reply  Wed Apr 13 09:18:50 2011, tara, DailyProgress, TempCtrl, time constant between can and cavity 
          Reply  Wed Apr 13 11:25:13 2011, Dmass, DailyProgress, TempCtrl, time constant between can and cavity 
             Reply  Wed Apr 13 11:29:50 2011, tara, DailyProgress, TempCtrl, time constant between can and cavity 
                Reply  Thu Apr 14 10:02:11 2011, tara, DailyProgress, TempCtrl, time constant between can and cavity RCAV_timecon.png
Message ID: 576     Entry time: Tue Apr 12 18:42:59 2011     Reply to this: 578
Author: Dmass, tara 
Type: DailyProgress 
Category: TempCtrl 
Subject: time constant between can and cavity 

Today we connected the PT1000 thermostat on RCAV's stack to C3:PSL-GEN_DAQ16. This will be used for time constant between chamber to cavity measurement.

 

We want to learn the time constant between the chamber's outside surface to the cavity, so we need to know the temperature of these two points.

The temperature on the outside surface of the chamber can be measured by 4 sensors that we already have. For the inside,

Frank left one PT1000 on the top seismic stack, just under the cavity inside the chamber. It's wired to the D-sub connector. We made a circuit, as shown below, to measure the change of the resistance( which is proportional to T) of the sensor.

insert fig

Slide1.png

R(T) at 30 C is about 1.2 k ohms.

SR560 is set to DC couple, gain x2. The output is connected to C3:PSL-GEN_DAQ16

This should give us the temperature of the stack inside the vacuum.

Now I'm waiting to see any change of the voltage.

 

 

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