High output value - Gen 2 QZFM - Presence of optomechanics in a Zero Gauss Chamber

[Marc Jofre Cruanyes]

Hi all,

I am working with a Gen 2 QZFM inside a Zero Gauss chamber. Initially, the chamber was empty but for the QZFM achiving a good calibration as shown in the Figure below:

Lately, I have been working in assembling a mechanical setup inside the chamber (breadboard, translation stages, mounts...), but when running the QZFM the "sensed" magnetic field is has increased. Also, when running the compensation coils, their values keep increasing continuously until saturation.

Any help?

I also have a degaussing unit which I have checked to achieve further demagnetization of the chamber (when no elements but the QZFM are inside the chamber), but resulting in high values as well when these mechanical components are inside the chamber.

Best regards,

Marc

[James Osborne]

Hi Marc,

It looks like the sensor has been switched to slave mode in the lower screenshot, this is may be the cause of the issue. You can switch between master/slave mode with command 113/114 respectively. If the sensor is configured in master mode but still does not work properly, then the components being placed inside the shield may be either too magnetic for the sensor to locally zero the magnetic field or creating excessive Johnson noise. 

Let me know if the problem is still not solved. 

Best regards,

James 

[Marc Jofre Cruanyes]

Hi James,

Thanks for the fast response.

I made sure that the magnetomter is in master mode and I removed all components inside the ZeroGauss shield and I got back to good numbers.

Then, I checked one by one the mechanical components and I identified the ones having magnetisms. I will replace them by plastic parts.

Thanks a lot.

Best regards,

Marc

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