Introduction

This user guide will help scientists and technicians correctly use the JR-6A Spinner Magnetometer (Figure 1). The JR-6A measures the magnetization of discrete samples, one at a time. Some scientists prefer the spinner magnetometer to the SRM Discrete program. The spinner magnetometer is also better at measuring weaker magnetized samples. There are some caveats regarding the use of the JR-6A, however, which are discussed later in this guide. For more questions, refer to the Agico Manual located in the Pmag library.

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1. Insert the calibration standard into the holder and tighten the set screw.  Center the standard in the holder by using your fingers on either side.  Wiggle the standard and tighten more if necessary; it is important that the sample does not slip.  Do not overtighten the screw, as it will cause the holder to break.
2. Close the coils and put on the shield.
3. Check the calibration standard settings by clicking Settings> Calibration Standard.  The magnetization and volume values should match the values written on the cube. Then select OK.
4. Open the calibration dialog box by selecting Execute > Calibration (Figure 5). 
5. Select Start.  As the standard runs, keep your hand on the spacebar. This is the kill switch/emergency stop and will need to be hit if the sample slips in the spinner and begins to scrape the side.  Listen for this as the spinner operates.
   1. The displayed Phase and Gain should be the “current” values. Gain should be within ±15% from the nominal value for the corresponding speed; Phase should be ±20° from nominal. If so, click Save. Otherwise, redo the calibration.
6. Remove the calibration standard from the spinner.  Make sure the screw head is flush with the holder or just below the edge.

Image Added

Figure 5: Calibration dialogue box.

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A.3 Specifications

Specifications

(Source: ascscientific.com)

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