SU834632A1 - Hall sensor graduating method - Google Patents

Description

(54) METHOD OF CALIBRATING THE CONVERTER

Holla

both converters with a constant magnetic field with an induction equal to the lower value of the graduation range of the Hall converters, then calibrated and exemplary Hall converters are placed in a pulsed magnetic field with an induction equal to the induction of a constant magnetic field, compare the readable signals of the graduated and exemplary Hall converters and attenuate a larger signal so that the difference signal is equal to zero, the required induction value of the pulsed magnetic field is set in calibration, t measurement of the difference signal and the output signal of the Hall transducer model and the magnitude of the Hall converters calibrated and exemplary signaling in a constant magnetic field, the magnitude of the difference signal and the output signal of the Hall exemplary transducer in a pulse magnetic field is judged sensitivity calibrated Hall transducer.

The drawing shows a device by which the proposed method is implemented.

The device contains a subtracting device 1, a differential signal recording device 2, a signal recording device 3 at the output of an exemplary HRP, a signal attenuation device 4, switches 5 and 8 of inputs b and 7, and a meter 9 of constant Hall voltages.

The device works as follows.

The inputs 6 and 7 provide the output signals and “and DO, respectively, with a calibrated and reference HRP (not shown). The transducers are placed in a constant magnetic field (not shown) with Be induction equal to the lower value of the graduation range. By connecting switch 8 in series to inputs 6 and 7, the voltage U, (Be) and Uo (Bo) are measured, respectively, at the outputs of the calibrated and reference HRP in a constant magnetic field.

These transducers are then placed in a pulsed magnetic field with induction equal to B, and they consider two cases.

In the first case, Lx / -Uo. The switch 5 is shifted to the upper position, the subtracted signals U and Uo are compared in the subtractor 1 and the attenuation coefficient of the device 4 is changed so that the difference signal at the output of the differential signal recording device 2 is zero. Then, the required induction value of the pulsed magnetic field By is set, and the magnitude of the differential signal DNU is measured using a recording device 2 and a signal Uos at the output of the reference HR with a recording device 3.

At the same time, both simultaneous and multi-temporal measurements of the signals of VL and Uoe are possible.

The magnitude of the signals Ux (Bo) and U (Bo), respectively, of the calibrated and exemplary HRP in a constant magnetic field with induction Bo equal to the lower value of the HR calibration range, the value of the difference signal AUe and the signal at the output of the exemplary HRC Uoe in a pulsed magnetic field determine the sensitivity of a calibrated HRP in a magnetic field with induction B by the formula

v.-J e ± 5X- / r. s / a Ux (Bo) HZ

-A "/ fsrar / 1ChG

where XOR is the sensitivity of model HRP

with indukv magnetic field B;

. Seam)

IR

signal attenuation ratio;

transmission coefficient of a melting device;

t / -. ,

f / e difference between & {

ifatl efi are nodes of calibrated and exemplary HRP in a magnetic field with induction. In the second case, Uj (Uc. Switch 5 is lowered, the subtracted signals Ux and U in the subtractor 1 are compared and the attenuation of device 4 is changed so that the difference signal at the output of the device 2 of the registration of the differential signal is zero.

Then set the value of induction of a pulsed magnetic field B required for grading and measure the magnitude of the difference signal Ujg using a recording device 2 and a signal Uos at the output of an exemplary HRP using a recording device 3. According to the value of Ux (V), the calibrated and exemplary HRP in a constant magnetic field with induction V0, equal to the lower value of the HRP calibration range, the magnitude of the difference signal uUft and the signal at the output of the exemplary HRP Uoe in a pulsed magnetic field t the sensitivity of the calibrated HRP in a magnetic field with induction B according to the formula

/ - Wow them (Wo}, ",

(4) "t Ui (8o) IB-UOB-K

where St is the sensitivity of the model HRP in a magnetic field with induction B;

K - transfer coefficient subtractive device.

Claims (1)

Invention Formula Method of calibrating the Hall transducer in a pulsed magnetic field, based on the comparison of the signals at the outputs graduated and exemplary Hall converters, characterized in that, in order to improve the accuracy of the calibration, both converters are subjected to a constant magnetic field with an induction equal to the lower value of the calibration range of the Hall converters, then the graduated and exemplary Hall converters are placed in a pulsed magnetic field with induction, equal to the induction of a constant magnetic field, compare the subtracted signals of the calibrated and exemplary Hall transducers and attenuate the larger signal so that The zero signal was set to zero, the magnitude of the induction of the pulsed magnetic field required for calibration was set, the magnitude of the difference signal and the signal at the output of the exemplary Hall transducer were measured and the magnitude of the signals of the graduated and exemplary Hall transducers in a constant magnetic field, the magnitude of the difference signal and the signal at The output of an exemplary Hall transducer in a magnetic field is judged by the sensitivity of the calibrated Hall transducer. Sources of information taken into account in the examination 1. Method of calibration of measuring instruments of constant magnetic fields in the range of 2-UT. MI 150-78. M. Standartiz, 1979, p. 7