摘要:
A method of interfacing a LC sensor (10) with a control unit (20) is described. Specifically, the control unit comprises a first (202) and a second (204) contact, wherein the LC sensor (10) is connected between the first (202) and the second (204) contact, and wherein a capacitor (C1) is connected between the first contact (202) and a ground (GND). In particular, in order to start the oscillation of the LC sensor, the method comprising the steps of: - during a first phase, connecting the first contact (202) to a supply voltage (VDD) and placing the second contact (204) in a high impedance state, such that the capacitor (C1) is charged through the supply voltage (VDD); - during a second phase (2004), placing the first contact (202) in a high impedance state and connecting the second contact (204) to the ground (GND), such that the capacitor (C1) transfers charge towards the LC sensor (10); and - during a third phase (2006), placing the first contact (202) and the second contact (204) in a high impedance state, such that the LC sensor (10) is able to oscillate.
摘要:
A measuring instrument for measuring a power of a measurement signal has an analogue processing device (1) and a calibration device (5) for carrying out a calibration process. The analogue processing device (1) has two detector diodes (14, 15) connected back-to-back relative to a signal input (10) and an amplifier (50) for amplifying signals derived from output signals of the detector diodes (14, 15). The analogue processing device (1) furthermore has a chopper device (28), which is connected in series between the detector diodes (14, 15) and the amplifier (50) at two terminals. In this case, the calibration device (5) comprises at least one current source, wherein the current source (46, 47) is connected to at least one input terminal of the amplifier (50).
摘要:
A detection calibration circuit includes a first distributor distributing a high frequency input signal, an amplifier amplifying the first high frequency output signal of the first distributor, a second distributor distributing the amplified first high frequency output signal of the first distributor, a reference signal generator outputting a reference signal in accordance with a switchable reference voltage, a switcher selecting a third high frequency output signal of the second distributor or a reference signal of the reference signal generator and outputting the selected signal, a detector detecting the third high frequency output signal of the second distributor or the reference signal of the reference signal generator from the switcher, a sensitivity switcher adjusting a sensitivity for an output signal of the detector, and a calibration control circuit adjusting a detection gain of an input signal of the detector and an input-output sensitivity for an output signal of the detector.
摘要:
A method of obtaining information about the position and/or orientation of a magnetic component relatively to a magnetometric detector, the magnetic component and the magnetometric detector being moveable independently from each other relatively to a static secondary magnetic field, the method comprising the steps of: measuring in the presence of the combination of both the magnetic field of the magnetic component and the static secondary magnetic field essentially simultaneously the strength and/or orientation of a magnetic field at at least a first position and a second position spatially associated with the magnetometric detector, the second position being distanced from the first position; and combining the results of the measurements to computationally eliminate the effect of the secondary magnetic field and derive the information about the position and/or orientation of the magnetic component.
摘要:
The invention relates to a method for setting up a current sensor (4) having an internal resistance which is dependent on the current (12) which is to be measured, wherein the internal resistance is set to a setpoint voltage drop (30) as part of a regulation (8) of an actual voltage drop (22) across the current sensor (4), comprising calibration or checking the plausibility of operation of the current sensor (4) based on a characteristic curve (38), in which the current (12) which is to be measured is compared to a variable (28) which is dependent on the internal resistance or to the internal resistance.
摘要:
A system comprises an inertial measurement unit comprising one or more gyroscopes configured to measure angular velocity about a respective one of three independent axes and one or more accelerometers configured to measure specific force along a respective one of the three independent axes; a magnetometer configured to measure strength of a local magnetic field along each of the three independent axes; and a processing device coupled to the inertial measurement unit and the magnetometer; the processing device configured to compute kinematic state data for the system based on measurements received from the magnetometer and the inertial measurement unit. The processing device is further configured to calculate magnetometer measurement calibration parameters using a first technique when position data is unavailable and to calculate magnetometer measurement calibration parameters using a second technique when position data is available.
摘要:
This charge state calculation device is provided with a detection means for detecting the voltage and/or the current of a battery (20), a charge state calculation means for calculating the charge state of the battery (20) from the values detected by the detection means, a full charge detection means for detecting the full charge of the battery, a correction value calculation means for calculating, when the full charge of the battery (20) is detected, a correction value for correcting the charge state calculated by the charge state calculation means to the charge state of 100%, a correction means for correcting a charge state calculated by the charge state calculation means by the correction value, and a display means for displaying the charge state thus corrected by the correction means, wherein the correction value calculation means updates the correction value only when the full charge of the battery (20) is detected, and maintains the updated correction value until next time the full charge of the battery will be detected.