30 results about "Electrostatic voltmeter" patented technology

The invention provides a device and method for calibrating a non-contact type electrostatic voltmeter. The method includes the steps that a direct-current high-voltage power supply and metal plate electrodes are utilized to acquire a standard static filed at local space near the centers of the electrodes, the voltage of the non-contact type electrostatic voltmeter can be traced to the direct-current voltage standard, and an experimental method that the edge effect is increased is adopted to test the edge effect of the metal plate electrodes. The risks that people get an electric shock are reduced through a glass flat plate support which bears the metal plate electrodes and through a protective resistor, and a perpendicular moving mechanism can adjust the test distance of a calibrated meter. A detachable vernier caliper is adopted, and therefore tracing is convenient to conduct.

An electrostatic voltmeter has an input sensing terminal, a first operational amplifier, a second operational amplifier, a first reference voltage terminal electrically connected to the non-inverting input of the second operational amplifier, a low reference voltage terminal electrically connected to the output of the second operational amplifier, and a voltage indicator, electrically connected between the low reference voltage terminal and the first reference voltage terminal.

A method and system for compensating for an image quality defect in an image printing system comprising at least one marking station, the at least one marking station comprising a charging device for charging the image bearing surface, an exposing device for irradiating and discharging the image bearing surface to form a latent image, a developer unit for developing toner to the image bearing surface, and a transfer unit for transferring toner from the image bearing surface to an image accumulation surface is provided. The method includes sensing the image quality defect on an image bearing surface by an electrostatic voltmeter (ESV) in the image printing system and determining the frequency, amplitude, and/or phase of the image quality defect by a processor. In one embodiment, the method includes compensating for the image quality defect by modulating the power of an exposing device during an expose process. In another embodiment, the method includes compensating for the image quality defect by modifying image content.

A non-contacting electrostatic voltmeter (ESVM) technique and apparatus having a spacing-independent dynamic response characteristic. Using the disclosed technique, an ESVM apparatus is capable of detecting and measuring electrostatic voltages and/or fields over wide variations of sensing probe to measured surface spacing with little or no variation in the dynamic response (speed and waveform) of the reported electrostatic voltage being measured. Disclosed is a feedback circuit that provides the spacing independence of the speed of response of an electrostatic voltmeter. In particular, the method and apparatus of the invention provides an AC-type auxiliary feedback loop that provides a means for a DC-feedback electrostatic voltmeter to maintain a fixed gain and thus stable response of the DC loop over a broad range of distances between the sensing electrode and measured surface.

The invention provides a measuring device for online monitoring of surface potential. The measuring device comprises: a signal excitation portion and a sample to be tested, which are arranged in a test chamber with constant temperature and constant humidity, and a signal collection portion arranged at the outside of a vacuum chamber; the signal excitation portion comprises: a ground electrode, a pin electrode and a high voltage source, wherein: the ground electrode is arranged on an upper surface of the sample to be tested and is in close contact with the sample to be tested, the pin electrodeis arranged on a lower surface of the sample to be tested through a first insulating bracket, and the high voltage source outputs a DC high voltage; and the signal collection portion comprises: a three-dimensional mobile platform, a first collection card, a probe, an electrostatic voltmeter, a second collection card and a detection module. The invention relates to online measurement of dielectricsurface potential, by means of the three-dimensional online measurement of the surface potential in a controllable environment, a high voltage can be applied to the pin electrode, synchronous measurement of the probe can be achieved, the defects of the offline measurement of the traditional electrostatic probe method are compensated, and a support is provided for the test and evaluation of dielectrical properties of dielectric in the future.

The invention relates to a real-time measuring system for changes of an electric potential on the surface of an insulating material. The system comprises a pedestal, a probe and electrode fixing support, a slide rail scale, a prober holder, a supporting column, a high-voltage electrode, a ground electrode, a capacitance probe, a probe protective cover, an insulating material fixing groove, a static voltmeter, a data acquisition system, a data process system, and a display interface. The probe and electrode fixing support is fixed above the pedestal through the supporting column. A slide guide rail is arranged on the fixing support. The high-voltage electrode, the probe protective cover and the probe holder are vertically arranged on the fixing support in sequence. The upper end of the capacitance probe is connected to the static voltmeter. The ground electrode is fixed to the pedestal. The insulating material fixing groove is arranged on the pedestal. The static voltmeter, the data acquisition module, the data process system and the display interface are connected in sequence. The system can measure on-line in real time electric potentials on the surfaces of different solid insulating materials and the same kind of solid insulating materials at DC voltages as well as in a power-off condition after surface modification.

The invention relates to a power-frequency AC withstand voltage detection method, and belongs to the technical field of power-frequency withstand voltage detection. Preliminary estimation is made according to the test voltage and capacity of a tested sample, and a proper test voltage regulating device and related equipment are selected; power supply of the tested sample is cut off, and all relatedconnecting lines are dismounted or disconnected; environment condition including the atmospheric pressure and temperature during test is recorded; and a horizontal adjusting screw in the bottom of anelectrostatic voltmeter is adjusted till a sprit level indicates that the electrostatic voltmeter is in a horizontal position, and proper measuring ranges are selected for related instruments. The technical ideal is clear, the method is convenient to realize, the voltage can be regulated smoothly, an output voltage higher than an input voltage can be obtained, the method also has advantages of low leakage reactance, low loss and low waveform distortion, a tested device is avoided from undue insulating breakdown during AC withstand voltage, maintenance time is shortened, and the service life of equipment is prolonged.

A system for voltage measurement of dielectric material in plasma includes a vacuum chamber. The system also includes an electrostatic receiver located outside of the vacuum chamber. The system also includes a conductive probe having a first terminus in contact with the dielectric material in the vacuum chamber and a second terminus in electrical communication with the electrostatic receiver. The system also includes a non-contact electrostatic voltmeter configured to measure a floating potential of the electrostatic receiver that corresponds to a dielectric potential of the dielectric material at a location in contact with the first terminus of the conductive probe.

The present invention provides a correcting assembly used for electrostatic voltmeter, a manufacturing method of correcting assembly and a correcting method thereof. The correcting assembly of electrostatic voltmeter comprises the following components: a base plate; a clamping part which is used for loading and clamping an electrostatic voltmeter; a high-voltage plate which is installed on the front end of moving direction of clamping part and is provided with an input end that provides a correcting standard according with the electrostatic voltmeter; a first slide way part which is installed on the base board and is provided with a body with one pair of first rails penetrating the clamping part; a scaleplate part which is installed on one side of clamping part and is provided with a graduated scale, a positioning bolt and a division indicator, and digital scratching marks are provided on the graduated scale; a second slide way part which is installed on the body of clamping part and is provided with one pair of second rails penetrating the clamping paw part that generates relative motion to the body; and a fine adjusting part which is provided at the back end of clamping part body and is used for fine adjusting the distance between the clamping paw part and the body.

The invention provides a portable electrostatic voltmeter detection device which comprises an outer frame, connecting shaft brackets are installed on the outer surfaces of the left end and the right end of the inner side of the outer frame, a rotating shaft is installed on the outer surface of the front side of the outer frame, monitoring blocks are arranged on the surface of the inner side of theouter frame at equal intervals, and a rotating handle is installed on the outer side surface of the lower end of the outer frame; a turntable is connected with the top of the inner end of the handle,a fixing frame is installed on the outer side of the middle of a connecting rod, the outer end of the fixing frame is connected with the inner wall of the outer frame, an extrusion plate is installedon the surface of the outer top end of a sliding plate, the inner end of the extrusion plate is connected with a supporting plate, and a clamping hole is formed in the joint of the extrusion plate and the supporting plate; a guide rod is arranged on the upper side surface of the outer end of the sliding plate, and a placing groove is reserved in the outer surface of the upper side of the supporting plate. The portable electrostatic voltmeter detection device can be conveniently carried by an operator, and raw materials with different sizes can be fixed when the portable electrostatic voltmeter detection device is used.

The invention relates to an electric voltmeter assembling device. The electric voltmeter assembling device comprises a bottom plate, an outer protecting shell and an upper cover plate. A connecting groove is annularly formed in the edge of the top of the bottom plate, first rubber gaskets are installed on the inner walls of both sides of the connecting groove, and through holes are evenly formed in the inner bottom end of the connecting groove; the outer protecting shell is detachably installed on the upper side of the bottom plate through fixing clamps, connecting plates are fixed to the positions, corresponding to the through holes, of the bottom of the outer protecting shell, limiting blocks are fixed to the top ends of the connecting plates, limiting grooves are formed in the joints ofthe connecting plates and the limiting blocks, positioning blocks are evenly fixed to the top of the outer side of the outer protecting shell, a cavity is formed in each positioning block, and a stopblock is fixed to the top of one side of each cavity; the upper cover plate is detachably installed on the upper side of the outer protecting shell. According to the electric voltmeter assembling device, no additional tool is needed, assembling and disassembling are convenient, the maintaining convenience is improved, and the device has high practicability.

The invention discloses a dry-type air-core reactor maximum short-time current experiment device and an experiment method thereof. The device comprises a single-phase voltage regulator T1, a test transformer T2, a rectification silicon stack D, a protection water resistor R1, a current shunt R2, a first circuit breaker ZN1, a second circuit breaker ZN2, an electrostatic voltmeter C1, a charging capacitor C2, a capacitive voltage divider, an oscilloscope XSC and a test sample dry-type air-core reactor L. Due to the fact that a direct-current charging method is adopted, only a test transformer with very small capacity is needed, and the capacity is not larger than 100 kVA; by utilizing the zero input response characteristic of the second-order circuit, when the capacitor is switched on at the highest voltage, the current of the loop is increased from the minimum zero current value to the maximum peak value, so that the current impact on the circuit breaker is minimum; the test loop is simple, a complex software control system is not needed, a large-capacity alternating-current transformer power supply and an oscilloscope are not needed, and the test device is a conventional instrument.

The invention belongs to the technical field of electromagnetic metering and relates to a non-contact electrostatic voltage measuring instrument automatic calibration device. The device comprises a cabinet, a plate electrode, a distance adjusting device, an image acquisition device, a high-voltage power supply and an upper computer, wherein the plate electrode is arranged on an inner top surface of the cabinet; the distance adjusting device is located on the lower side of the plate electrode and used for adjusting the vertical distance between a calibrated electrostatic voltmeter and the plate electrode, a clamp is fixed to a moving part of the distance adjusting device, and the clamp is used for clamping the calibrated electrostatic voltmeter; the image acquisition device is used for acquiring the reading of the calibrated electrostatic voltmeter and is arranged on one side of the distance adjusting device; the output voltage of the high-voltage power supply is adjustable, an output end is electrically connected with the plate electrode, and an input end is electrically connected with the power supply; and the upper computer is electrically connected with the high-voltage power supply, the distance adjusting device, the image acquisition device and the power supply respectively. The device is high in safety and controllability, automatic voltage adjustment, automatic reading, automatic discharging and automatic positioning of the distance between the calibrated electrostatic voltmeter and the plate electrode in the calibration process are achieved, and safety and convenience of the device are improved.

The invention provides an electrostatic treater which comprises a detection circuit and two detection ends. The detection circuit is formed by connecting a power supply, a bulb and a switch in series through guide lines. The two detection ends are respectively located at two ends of the detection circuits. The electrostatic treater has the advantages of being better removing static electricity in a detection instrument and a device to be detected, bringing convenience to utilization by people, being simple in structure, convenient to maintain, low in processing cost, and the like.

The invention relates to a method for detecting static electricity in the chemical powder packaging process. The problems that in the prior art, explosion and poor safety are prone to being caused dueto non static electricity elimination are mainly solved. The method for detecting the static electricity in the chemical powder packaging process comprises the following steps that (1) in the packing, discharging and packaging processes of chemical powder, the electrostatic voltage on the surface of a packaging bag is monitored in real time, and the distance from an electrostatic voltmeter to thesurface of the packaging bag is kept constant; (2) in the process from discharging packaging to package finishing, the electrostatic potential of a human body is monitored in real time; (3) when theelectrostatic voltage on the surface of the discharging packaging bag exceeds 30 KV or the electrostatic voltage of the human body exceeds 3 KV, an alarm system issues an alarm. The problems are wellsolved by adopting the technical scheme, and the method can be used for static electricity detecting in the chemical powder packaging process.

An apparatus 10 for poling piezoelectric material includes a platen 22 which holds a sample 20 of piezoelectric material to be poled and a stage 30 to which the platen is mounted. The stage 30 is arranged to selectively move the platen 22 and thereby the sample 20 which the platen 22 holds. The platen 22 is movable by the stage 30 selectively between a first position and a second position. A corona source 40 generates a corona to which the sample 20 is exposed when the platen 22 is moved to the first position by the stage 30. An electrostatic voltmeter 60 having a probe 62 measures a surface potential of the sample 20 when the platen 22 is moved to the second position by the stage 30.

The invention discloses a measurement principle of the infinite high frequency relative permittivity of an insulating dielectric, which solves the technical problem that the infinite high frequency relative permittivity of the insulating dielectric cannot be accurately measured. The basic principle of the present invention is to use a high-voltage DC power supply to polarize the measured dielectric, and then use an acquisition system composed of an electrometer, an electrostatic voltmeter and a computer to realize the collection and recording of the short-circuit current and recovery potential time-domain spectrum of the measured insulating dielectric , through the least squares fitting to accurately obtain the initial time change rate of the recovery potential, from the initial time change rate of the recovery potential and the short-circuit current I _d (t _1‑ ), through the formula to obtain the infinite high-frequency relative permittivity ε _∞ Measurement.

The invention relates to a 10kV pole-mounted switch voltage transformer field calibration device. The device comprises a high-voltage binding post, a first low-voltage binding post and a second low-voltage binding post. The high-voltage binding post is connected to a first high-voltage terminal of a transformer through a high-voltage insulated wire; the first low-voltage binding post is connectedto a first low-voltage terminal of the transformer through a low-voltage insulated wire, and the second low-voltage binding post is connected to a second low-voltage terminal of the transformer through a low-voltage insulated wire; the second low-voltage binding post and a second high-voltage terminal of the transformer are grounded through a grounding wire; a low-voltage voltmeter and a booster are arranged in parallel between the first low-voltage binding post and the second low-voltage binding post; and the high-voltage binding post is further connected to the first end of an electrostaticvoltmeter, and the second end of the electrostatic voltmeter is grounded.