Ruprecht Karls University of Heidelberg
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FP75-78 Computer-Based Device Controlling and Data Processing
Experimental Setup

  • Electric scheme
    [scheme]

  • Specimen holder
    [specimen holder]

  • Temperature
    A Peltier element is used for warming and cooling the specimen.
    The temperature is measured using a Pt1000 thermometer.
    Pt1000 resistance table

    As an approximation, an expresion 
    Temperature = ( Voltage - 1.000325 ) * 259.2684
    can be used.
    The tuning of the Peltier-Element and the readout of the Pt1000 thermometer are performed via a separate amplifier, which is controlled via the AD ports of the lock-in amplifier.

  • Devices
    • The three most important devices are presented on the picture to the right.
    Left upper part: the wave form generator DS 340,
    Right upper part: the high voltage battery,
    Lower part: the lock-in amplifier SR 530.
    Here are the manuals for the devices.     		   [devices]
    (click to enlarge)

       The waveform generator DS340 by Stanford Research Systems.
      
       The lock-in amplifier SR530 by Stanford Research Systems is an analog double phase lock-in. It can measure two signals X = A×cos(φ) and Y = A×sin(φ) in parallel. Further information about the funktionality of a lock-in can be found in the task instructions and on http://www.lockin.de .
      
       The high voltage battery is self-made. It is produced in the Electronics Division of the Kirchhoff-Institut für Physik. It consists of twelve 9V block batteries connected in series, which produces up to 108 V. This voltage is conducted out via a series resistance of approx. 300 MOhm.

Last modified: 23.05.2006 - 13:42 (vl) Comments to: victor (at) kip.uni-heidelberg.de