摘要:
The present invention relates to a method of automatically fine adjusting balances comprising a computing instrument and digital display means, wherein the load is determined throughout the measuring range in terms of measuring units that are smaller than the units used for the indication. The object contemplated by the present invention resides in providing automatic zero adjustment in the zero range, which will permit a uniform degree of resolution for all values and identical load ranges for each value throughout the entire weighing range to be obtained. The automatic adjustment in the zero range relieves the operator of the necessity of doing more than infrequently resetting the coarse adjustment. At the same time manipulations in favour of the operator are practically impossible to carry out. The proposed method comprises first in each weighing ascertaining whether the measured value determined by the computing instrument is within the zero range and if so deducting 5 measuring units from the measured value, the result replacing a previously stored adjusting factor as a fresh adjusting factor, whereas in the alternative case the stored adjusting factor is deducted from the measured value determined by the computing instrument and the result indicated in multiples of indicating units. The invention also relates to a balance for performing this method comprising a computing instrument, digital display means, manually operable coarse adjusting means and an automatic fine adjusting means, wherein the measured load is determined by the computing instrument throughout the measuring range in measuring units that are smaller than the units in which the indication is made, characterized in that the smalles digit of the final decimal of the digital display means represents one unit of the indication, that in each measurement an adjusting factor stored in measuring units in a storage device is deducted in a first arithmetic unit preceding the computing instrument and connected to the computing instrument, from the measured value determined in the computing instrument, and that the result is indicated by the digital display means, that the value stored in said storage unit is determined by a second arithmetic unit connected through an AND-gate to the computing instrument and to a zero range circuit in such manner that whenever the measured value is within the zero range five measuring units are deducted from this measured value in said second arithmetic unit and the result used to replace the adjusting factor previously stored in the storage device.
摘要:
An improved electrical balance is disclosed of the type including stationary and load-responsive movable components, means being provided for supplying to signal evaluating means an analog load signal having a function that varies with load, said evaluation means being periodically operable during successive measuring periods to produce digitalized measurements that correspond with the load. The invention is characterized by the provision of balance monitoring means that disable the evaluation means in the event that movement of the movable balance component exceeds predetermined limits during the measurement period. The monitoring means further effects the transfer of each digitalized measurement result to associated data storage means only when the movement of the movable component has not exceeded the predetermined limits during the corresponding measurement period. In balances including load compensation means, the load signal may be the compensation current that is supplied to the compensation coil means.
摘要:
An arrangement for determining the weight of an object relative to a predetermined reference weight. A compliant system is vibrated along a predetermined axis substantially at the mechanical resonance frequency, said system having means for supporting the object. The system oscillation amplitude is proportional to the inertia of the system and is independent of gravity. The oscillation amplitude of the system is converted into an electrical signal which is compared with a reference signal representative of the reference weight and an error signal is utilized to provide a measurement and/or control function in correspondence with the difference between the weight of the object and the reference weight.
摘要:
Two pretensioned vibrating strings are respectively stressed and stress-relieved by a force to be measured, said force being applied through an adjusting member by which the angle of force application can be varied to compensate initial errors of the apparatus.
摘要:
A 90* phase angle lag is created between the resonant vibration frequency of a load on a belt conveyor and the frequency of a motor driven eccentric inducing vibration to stringers supporting the belt conveyor between vertical members and deviation of said phase angle is detected by a phase sensitive network which adjusts the motor. The speed of the motor is converted into a linear alternating current voltage transmitted across a potentiometer adjusted by the speed of the belt conveyor to produce the product of the speed of the belt conveyor and the load on said conveyor.
摘要:
An electrical mass meter having a frame with a baseplate, a weighing platform, a pre-tensioning mass linked to a force distributor which is in turn linked to the weighing platform, a plurality of transversely vibratable pre-tensioned strings having one end fixed to the weighing platform and the other end to the force distributor, and a transmitting element fixed to the frame and the strings, supporting thereby the weighing platform and transmitting to the strings an additional force proportional to a mass to be measured.
摘要:
A magnesium zinc oxide (MZO) nanostructure modified quartz crystal microbalance (MZOnano-QCM) takes advantage of the unique sensing ability and biocompatibility of MZO-based nanostructures, and combines them with the dynamic impedance spectrum capability of the bulk acoustic wave (BAW) devices including QCM, to form a real-time, noninvasive and label-free cell monitoring biosensor, specifically detecting the susceptibility and resistance of bacterial and fungal strains and cancer cells to various antibiotic and antifungal drugs and anticancer drugs, respectively.
摘要:
Gas supply device, comprising a frame equipped with a base and accommodating a plurality of pressurised fluid cylinders connected to a fluidic circuit comprising a first connection end connected to the cylinders and a second end comprising at least one fluidic connection intended to be connected removably to an extraction or filling element for the cylinders, the frame comprising on one of its faces at least one opening giving access to at least one connection of the circuit, the frame also comprising at least one attachment element provided to cooperate with a lifting device.