Test probe for Hall element board repair

Thread Starter

nsaspook

Joined Aug 27, 2009
6,577
Needed a test probe to provide a operational metering test after board repair and self-calibration for some old semi-obsolete systems.

The analog boards require just the GaAs sensor element and a few resistors for (non-calibrated) operation to test 3 Tesla magnetic fields control systems. The calibrated probes are far too expensive and rare to use for repair testing.
E500.8.jpg
The measurement Hall element of the new probe.

http://www.hallsensors.de/CYSJ302C.pdf

Element mounted on vector board with Kapton polyimide film tape for protection.

Test magnet.


Analog output zero'd with mag-base off in the Fluke 8846A.


Mag-base on and sensor board edge touching. It looks like 10 volts would be a good min test voltage in the repair spec.
 

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Thread Starter

nsaspook

Joined Aug 27, 2009
6,577
Typical hall probe usage. For most applications the absolute value is not a calibration requirement. High precision and repeatability for a given 'tuned' machine setup is paramount.
http://www.innovioncorp.com/wp-content/uploads/2016/07/IIT2006-0175-4.pdf
The ion energy delivered by the Axcelis GSD/HE ion implanter is determined by the setting of the Final Energy Magnet (FEM). A gauss probe situated between the FEM poles is used to measure magnetic field; this probe has high precision and repeatability, but does not measure absolute magnetic field.
 
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