v.378PD-2000 A.F. Demagnetizer Quick Start Guide

Current revision: V378P

Introduction

 This manual is aimed to help scientists and technicians correctly use the D-2000 A.F. Demagnetizer. It is a very helpful tool in that it demagnetizes discrete samples in fields up to 200 mT, whereas the cryogenic magnetometer can only go as high as 80 mT. In addition, the D-2000 can impart an ARM or pARM onto discrete samples.

Figure 1: Dtech in the Paleomag Lab.

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1. To create a list of demagnetization steps, click the number 1 button next to the "Demag Settings" option. The Demagnetization Settings window will open. (Figure 4).
   
   1. 1. If a list of demagnetization steps has already been created and saved, it may be opened by selecting the OPEN button at the top of the D2000 main window.

   
   
   Figure 4: Demag settings.

2. In the space below "Peak Field List", type what intensity of field you want to demagnetize with – i.e. if you want a 10 mT field, type "10".
3. Select the decay rate under "Decay Rate List". Note: It is possible to get errors during demagnetization when a decay rate that is too low is paired with a field intensity that is too high. If this error occurs, simply increase the decay rate for the desired intensity and redo the demagnetization step.
4. Click the Add button to add a step to the demagnetization set.
   1. The selected field will appear in the box on the bottom left of the Demagnetization settings window and the decay rate will appear on the bottom right. Add all steps you wish to use.
5. Click the Accept button at the bottom of the box when finished. The demagnetization settings will be displayed on the main window. It is possible to delete an entry or add others to the list after clicking accept. Simply select the number 1 again and edit the list as needed.
6. Place samples in Dtech sample holder and place the holder into the Dtech.
7. Select the demagnetization field you wish to use from the Peak Field list. Make sure that both pARM and ARM are off. (Figure 5).
   

   

    Figure 5: Main D2000 Window with demagnetization set selected. 

8. Click Run Demag. Once the "Percent done" loading bar has reached 100% and the "Field Intensity" bar states: "Run Completed," the samples can be removed.

PARM

1. Click the number 2 next to the "pARM Settings" to open the pARM settings window (Figure 6).
2. Choose the desired starting field, ending field, and intensity for the particular pARM. Create a list of the desired steps by clicking add or insert. Click accept when the list is finished.
3. Click the pARM off button on the top toolbar so that it displays pARM on.
4. Place samples inside the Dtech.
5. Click Run pARM.

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• The question mark "?" at the top right of the tool bar can be used to answer most questions the user may have regarding this program.

• The following is table of specifications for the D-2000 A.F. Demagnetizer:

  Specifications:
  AF Peak Field:	0.2 T (2000 Gauss)
  Minimum AF Field Step:	0.0001 T (1.0 Gauss)
  ARM Peak Field:	0.0015 T (1.5 Gauss)
  PARM Peak Field:	0.0015 T (1.5 Gauss)
  AF Decay Rates:	Eight discrete rates available
  Minimum PARM Step:	0.0001 T (1.0 Gauss)
  Sampling Handling	Static - Holds 4 (D-2000) or 3 (D-2000T) 1" cyl. or cube samplesD-2000T Tumbler - Holds one 1" dia or 2 cm cube Tumbler is removable, allowing Static or Tumbler operation
  Computer Interface:	Mobile Pentium-based computer
  Operating System:	Microsoft Windows

  Source: ascscientific.com