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OUTLINE SCM block diagram : a brief reminder

OUTLINE SCM block diagram : a brief reminder Preamplifier (PA) specifications versus EM measurement Sensor (SC) specifications versus EM measurement. PA & Sensor ICD Conclusion. 1 ) SCM block diagram : A brief reminder Sketch of single preamplifier & sensor Two stages of amplification :

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OUTLINE SCM block diagram : a brief reminder

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  1. OUTLINE • SCM block diagram : a brief reminder • Preamplifier (PA) specifications versus EM measurement • Sensor (SC) specifications versus EM measurement. • PA & Sensor ICD • Conclusion

  2. 1) SCM block diagram : A brief reminder • Sketch of single preamplifier & sensor • Two stages of amplification : • 1st stage : low noise preamplifier • 2nd stage : filtering & amplification • b) View of preamplifier for tri axis SCM • 1 PA/Sensor • 1 Voltage supply regulator • 1 Calibration function

  3. 2) Preamplifier (PA) specifications versus EM PA measurement (at cube level) • Tests conditions : Tamb=25°C ; V+=7,6V ; V-=-6,6V • Preamplifier of SCM with 3 PA cubes inside is under assembly. • N.B. : EM4 is a spare cube.

  4. Typical transfer function of PreamplifierMeasurement is compliant with specifications.Temperature dependency is small.Ongoing tests will concern whole PA (Preamplifier +Calibration function).

  5. 3) Sensor (SC) specifications versus EM measurement. • Measurement at each step of manufacturing. Table below shows measurement at last step (after magnetic core potting) EM measurement results close to Design for relevant parameters : Resistance and slope (obtain from numerical simulation).Relevant parameters for EM are closed (<5%).

  6. Typical transfer function for EM Sensor(SCEM2 is presented) : • Slope is measured at low frequency. • Resonance frequency will be flattened by flux feedback.

  7. 4) Preamplifier & sensor ICD Preamplifier ICD : Output (differential) : analog signals +/-5V (maximal values +7,6V/-6,6V). Gain : 1V/nT (in flat bandwidth at -3dB [55Hz to 4kHz]). Voltage supplies lines : +10V, -10V, and AGND (0V) Maximal current on both+/-10V : 4 mA One digital signal SCM_CAL used to control the SCM calibration

  8. SCM orientation ICD. • Convention : « When Sensor is aligned with magnetic field (wires on extremity arrow), phase between voltage output of preamplifier and magnetic field in the flat part of the bandwidth is close to 0°. » • Magnetic axis will be calibrated (accuracy 0,2°) at “Chambon la Forêt”.

  9. 5) Conclusion • No major change on electrical design have been reported : • Only 1 Calibration command is used • Performances meet requirements : • Sensitivity for EM will fit sensitivity scientific requirements : • 0,85pT/sqrt(Hz) at 10Hz. • 20fT/sqrt(Hz) at 1kHz. • Power consumption at cube level is compliant with requirement. Validation on whole preamplifier might be compliant (expected <80mW). • Transfer function, sensitivity, power consumption and magnetic axis will be checked during complete calibration of SCM.

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