263 results about "Sensitivity testing" patented technology

A radio interference detection and screening system for performs on-locomotive testing of Locomotive Control Unit (LCU) radios. To eliminate bit errors during LCU sensitivity testing (also known as Bit Error Rate (BER) testing), the system detects interfering transmission signals which may cause bit errors in the transmission of test data, and suspends the LCU sensitivity performance testing during periods of detected external transmissions. Once the interfering transmissions are no longer detected by the system, the LCU then resumes the LCU sensitivity performance testing.

The invention relates to a low-voltage electric wire carrier communication test method and a testing system thereof. The testing method comprises the following testing methods: I, a carrier transmitting PWL online testing method; II, a carrier receiving sensitivity online testing method; III, a carrier communication anti-interference online testing method; IV, a low-voltage circuit impedance change online testing method. The testing system comprises a carrier transmitting device, a program control attenuating device, a tested carrier receiving device, a manual power network, a frequency spectrograph receiver, a computer, a frequency spectrograph, a noise simulator, an impedance simulator and a purifying power. The invention has the advantages of adopting a manual power network parameter model regulated in GB/T 6113 F2, thus having a high standardization degree and comparable testing data; avoiding the testing problems brought by adopting different carrier communication schemes; realizing the online sensitivity testing; carrying out the test at any time and being not affected by the external environment factors like the weather; besides, the invention can simulate the impedance change environment of a real circuit, thus leading the analyzing of the carrier communication on the impedance change of the circuit to be feasible.

The invention discloses an electromagnetic radiation sensitivity testing method for increasing test precision, which comprises six steps: a single radiating antenna is used for radiating from a far field, and the radiating power of the antenna, the field intensity value of electric-field sensors and the distance between the antenna and the electric-field sensors are measured; a tested device is placed, and a plurality of electric-field sensors are arranged; the values of the electric-field sensors are recorded at the moment; the radiating antenna is approached to the tested device, the difference of the field intensity value at the moment and the field intensity measured in the last step is from 0dB to 6 dB, and the values of the electric-field sensors are recorded at the moment; the power of the radiating antenna is calculated in standard field intensity; and a sensitivity test is carried out. The invention gives out satisfying conditions between the radiation field intensity Elim prescribed by a testing standard and the radiation power P of the radiating antenna, utilizes an antenna theory to calculate the satisfying conditions between the power of the radiating antenna and the measuring field intensity value of a testing point when an internal coupling field of the tested device reaches the testing requirement and gives out a quantized calculating method, thereby increasing the precision of the electromagnetic radiation sensitivity test, and ensuring that a testing result is accurate and can repeatedly appear.

A combined microwave sensor comprises metal ground at the bottom layer, dielectric at the middle layer, an input port, an output port I, a branched line coupler, a power divider, an open resonant ring, a microstrip line I and a microstrip line II, wherein the input port, the output port I, the branched line coupler, the power divider, the open resonant ring, the microstrip line I and the microstrip line II are arranged in the top layer. The input port and the output port I are connected with a vector network analyzer. The output side of the branched line coupler is provided with an isolated port and the output port I. The input end of the power divider is connected with the input port. The output port II and the output port III are connected with an annular directional coupler through a microstrip line. The open resonant ring is arranged between the power divider, the branched line coupler and the two microstrip lines. The combined microwave sensor has advantages of effectively eliminating background noise, realizing testing for weak background signals, and ensuring large offset of the sensor resonant frequency through small disturbance of the tested object. Therefore the combined microwave sensor provided by the invention has higher sensitivity and higher accuracy in dielectric constant measurement and can be used in high-sensitivity testing with small dielectric constant change.

The invention discloses a core stress sensitivity measuring method based on nuclear magnetic resonance. Core stress sensitivity is measured on the basis of conventional displacement experiments and nuclear magnetic resonance testing methods. The method includes the steps that core pretreatment is conducted; a core is subjected to pressurized saturation to simulate formation water; the core is placed in a non-magnetic core clamp to be fixed to an NMR coil; confining pressure is set to test the nuclear magnetic resonance T2 relaxation spectrum of the core; stress values are set for repeated testing at intervals; the highest static stress values are sequentially reduced from 20 MPa to 2.5 MPa, each stress value is kept for a certain period of time to test the T2 spectrum, and the current conventional permeability and NMR permeability are obtained through computation; a core conventional stress sensitivity curve is drawn. By means of the method, people can understand the core stress sensitivity change rule from the micro perspective, characteristics such as pore size distribution, porosity changes and NMR permeability in the experiment process are provided, and change rules of microfracture compact matrix limestone pore size distribution, porosity and permeability in stress sensitivity testing can be effectively detected.

An implantable cardiac stimulation system capable of automatic capture verification is provided with an associated method for performing automatic testing functions using programmable, or automatically determined, AV delays. Automatic threshold testing and evoked response sensitivity testing performed at a user-specified AV delay setting, rather than a preset setting, allows assessment of automatic capture verification based on an AV delay relevant to daily system function. Further features of the present invention are an adjustable frequency with which automatic threshold tests are performed and an adjustable frequency with which threshold test results are stored in memory in a threshold record for better monitoring of lead stability or impending clinical problems. The frequency of performing threshold tests and the frequency of storing threshold test results may be varied according to the threshold stability. Stored threshold test results are advantageously displayed with respect to a fixed or variable time scale.

The invention discloses a laboratory simulation detection device for a low-voltage meter reading system and aims to provide the laboratory simulation detection device for the low-voltage meter reading system, wherein the laboratory simulation detection device can carry out comprehensive test on all independent collecting equipment of the low-voltage meter reading system and the whole low-voltage meter reading system and can evaluate the data collecting and communication ability of the low-voltage meter reading system under the site environment in the laboratory environment. The laboratory simulation detection device comprises a to-be-detected product group, an equipment basic-parameter testing unit, a carrier wave launching testing unit, a receiving sensitivity testing unit, an interference signal simulation module, a relay routing simulation module, a reactive power compensation simulation module, a line impedance simulation module, a testing unit and simulation module control system, a testing device master station platform, a testing device master station control software and a power supply. In the laboratory simulation detection device, the software simulation technique and the hardware simulation technique are adopted to carry out the comprehensive test on all the independent collecting equipment of the low-voltage meter reading system and the whole low-voltage meter reading system, and the data collecting and communication ability of the low-voltage meter reading system under the site environment can be evaluated under the laboratory environment.

An apparatus and method are provided for use in a transceiver that enable the transceiver to test itself to determine whether the receiver portion of the transceiver meets receiver sensitivity requirements and stressed receive sensitivity requirements.

The invention discloses a testing method of an avalanche photodiode, which is characterized by comprising the following steps that (1), a function control circuit and a testing circuit are arranged on a circuit mainboard, and the function control circuit tests the avalanche photodiode through controlling the testing circuit; (2), a sensitivity testing amplitude limiting amplification circuit, a reverse breakdown voltage testing circuit and a light current and dark current testing circuit are arranged in the testing circuit in Step (1); and (3), a Boost high voltage generation circuit, a linear voltage stabilization filter circuit, a constant current source generation circuit, a feedback type IV (current-voltage) conversion circuit, an isolated power supply circuit and an optocoupler transmission circuit which are connected sequentially are arranged in the testing circuits in Step (2). The invention further discloses a testing device of the avalanche photodiode, which implements the method.

The invention discloses method for testing sensitivity of a wireless communication product in an ISM (Industrial, Scientific and Medical) frequency band, relating to methods for testing the sensitivity of the wireless communication products and solving the problem of low accuracy in a sensitivity test because the traditional method cannot simulate an actual condition. In a system I, signals emitted by an emitter are input into a receiver through an adjustable attenuator and a fixed attenuator. In a method I, the error rate from the adjustable attenuator to the receiver is adjusted to determine whether a preset error range is reached, and the sensitivity of the receiver is calculated. In a system II; the signals emitted by the emitter are input into the receiver after being processed by the adjustable attenuator I, a power distributor, a combiner and N adjustable attenuators II. In a method II, the reference attenuation values of the adjustable attenuators are respectively adjusted, the length of a transmission line is adjusted to make the receiver in a critical state, and a power meter is adopted to test the received signal power of the receiver and calculate the sensitivity of the receiver. The systems and methods disclosed by the invention are suitable for testing the sensitivity of the wireless communication products in the ISM frequency band.

The invention relates to an explosive performance detection device, in particular to an explosive collision sensitivity instrument, which is mainly used for solving the problems of poor testing consistence, low testing accuracy and difficulty in ensuring the testing conditions existing in the conventional collision sensitivity testing device. The explosive collision sensitivity instrument comprises a drop hammer elevating and positioning mechanism, a drop hammer fixing and releasing mechanism, a collision device mechanism, an optically-controlled anti-secondary-collision mechanism and an integral control mechanism, wherein the drop hammer elevating and positioning mechanism comprises a base, an elevating guide rail which is vertically fixed on the upper surface of the base, an upper fixed plate which is horizontally fixed at the top end of the elevating guide rail and an elevating plate of which the end part is connected with the elevating guide rail in a sliding manner; and the drop hammer fixing and releasing mechanism comprises a drop hammer, a drop hammer sucking cover and a vacuum pump connecting pipe. The explosive collision sensitivity instrument has the characteristics of Custer and 12-type tool testing structures, can be used for detecting the sensitivity properties such as collision explosion probability, characteristic drop height and the like of an explosive, and can be used for detecting the safety performance of the explosive.

An automatic test system for high-altitude electric field radiation sensitiveness is disclosed and relates to the technical field of electromagnetic compatibility testing. The system comprises a large-sized detected member, an emission antenna system, a large power signal simulation system, a high-altitude upgrading platform, a field intensity monitor, an electric field probe and a control computer, wherein the control computer is used for sending control instructions to the large power signal simulation system via a signal interface board, the large power signal simulation system is used for generating small power microwave signals and amplifying the same, large power microwave signals are generated and transmitted to the emission antenna system, the emission antenna system is used for subjecting the coupled large power microwave signals to radiated emission into space, high field intensity electromagnetic wave signals are generated in space, the electric field probe is used for monitoring the high field intensity electromagnetic wave signals generated by the emission antenna system in space in real time, and monitoring results are sent to the control computer via the field intensity detector. The system disclosed in the invention can satisfy electric field sensitivity testing requirements for the large-sized measured member which is less than 18 m in height such as a carrier rocket and the like.

This invention relates to a system for auto-testing wireless LAN RF index, belonging to auto-controlling technology field, which adopts WLAN test equipment as flat form, comprising frequency spectrograph E4445A, signal source E4438C, danamometer E4416A, signalyzerE8408A and programmable fader 11713A and so on, using IEEE488 bus and its communication protocol via software programming to actualize auto-test of WLAN RF unit. The software is composed of a basic driving block, a bar-code scanning block, a power-testing block, a waveform testing and analyzing block, a minimum sensitivity testing block, a throughput testing block and a database-generating block. The invention use present testing equipment to actualize the auto-testing of wireless LAN RF unit function, and judges the test and improves service efficiency of the system and productivity in batch.

The invention discloses equipment and a method for testing comprehensive vision functions. The equipment for testing the comprehensive vision functions comprises a first display and a vision function tester. The vision function tester is connected with the first display; the display can display video data under the control of the vision function tester, and the video data are used for testing at least one vision function by the aid of the vision function tester; the vision function tester is provided with a vision acuity testing module and a spatial contrast sensitivity testing module; the vision acuity testing module is used for testing the vision acuity; the spatial contrast sensitivity testing module is used for testing the spatial contrast sensitivity. According to the scheme, the equipment and the method have the advantages that the vision acuity and the spatial contrast sensitivity can be tested, accordingly, the comprehensive vision functions can be tested, the problem that only the vision acuity can be tested while the vision cannot be comprehensively assessed is solved, and the equipment and the method are favorable for finding defects of certain vision functions of tested objects and beneficial to follow-up treatment on the tested objects and have high practical value.

The invention relates to a high-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions. The analysis objects not only comprise Cl<->, NO2<->, NO3<-> and SO4<2->, but also comprise easily polarized ions Br<->, I<-> and S2O3<2->. A negative ion analysis column AS9-HC and a protection column AG9-HC are adopted together, the washing solution comprises Na2CO3 and NaHCO3 in a concentration ratio of 9mm: 1mm, the flow rate of the washing solution is 0.9 to 1.1ml/min, the detector is an electrical conductivity detector, the current of a suppressor is 88mA, the temperature of the columns and the temperature of a detection cell are 28 to 32 DEG C, and the used quantitative ring is a polyether-ether-ketone (PEEK) tube with inside diameter of 0.030in, outside diameter of 1/16in and length of 7m. The lower detection limits of the ions are low and reach nano scale, namely the lower detection limit of Cl<-> is 0.61 nanometer, the lower detection limit of the NO2<-> is 0.94 nanometer, the lower detection limit of the NO3<-> is 0.93 nanometer, the lower detection limit of the SO4<2-> is 0.81 nanometer, the lower detection limit of the Br<-> is 0.90 nanometer, the lower detection limit of the I<-> is 2.48 nanometers and the lower detection limit of the S2O3<2-> is 1.84 nanometers. The method is simple and convenient for operation, and can be used for implementing high-sensitivity measurement of multiple negative ions indoors or outdoors.

The invention discloses a method for judging the optimal working voltage of an APD (Avalanche Photo Diode) of a 10G EPON (Ethernet Passive Optical Network). The method comprises the following steps that: S1: according to the testing data of a BOSA or RSSI (Received Signal Strength Indicator) under a dark condition, obtaining the reverse breakdown voltage Vbr of the APD; S2: setting initial value working bias voltage, selecting fixed input light power, according to preset time of duration, testing a current error code rate or an error code number, then, carrying out stepping increasing on the working bias voltage by a set stepping value to repeatedly test at least three points until the error code rate or the error code number is increased; S3: taking the working bias voltage x and the error code rate y to solve a quadratic equation of one unknown y=ax2+bx+c to obtain three coefficients a, b and c; S4: according to the three obtained coefficients a, b and c, calculating an extreme valuex=-b/2a, and obtaining a corresponding APD DAC (Digital to Analog Convertor); and S5: utilizing the APD DAC value to carry out sensitivity testing, if the sensitivity testing is qualified, carrying out subtraction and translation on the APD DAC of the current temperature and an APD DAC LUK table to be updated into the APD DAC LUK, and if the sensitivity testing is unqualified, failing.

The invention discloses a piezoelectric strain sensor, a method for testing the strain sensitivity of the piezoelectric strain sensor and the application of the piezoelectric strain sensor. The sensor comprises a piezoelectric ceramic piece, a silica gel layer and a packaging layer, wherein the silica gel layer makes the sensor stressed evenly and good in sensitivity, and the packaging layer makes the sensor good in insulating property and resistant to interference of the external environment. According to the method, strain sensitivity testing is carried out through a constant-strength beam device, the strain sensitivity (mV/mu epsilon) of the sensor under the condition of different low vibration frequencies of a bridge can be tested, and the strain of a bridge structure can be indirectly reflected according to the strain sensitivity under different vibration frequencies and the voltage output of the sensor; in this way, the piezoelectric strain sensor can replace a strain gage to measure the strain of structures like the bridge under low frequencies, various shortcomings caused by using the strain gage are overcome, and the sensor has broad application prospects in bridge monitoring.

The invention relates to a detection method for sensitivity to a fire by a smoke detector. The detection method comprises: a fire laboratory is constructed in advance, wherein at least a plurality of to-be-detected sample machines of smoke detectors, a smoke generating unit for make smoke, and a plurality of smoke detectors for monitoring smoke concentrations are arranged in the fire laboratory and a processor in communication connection with the to-be-detected sample machines and the smoke detectors is also arranged; the smoke generating unit is started and is controlled to make smoke with the concentration reaching a calibration value within a predetermined time range; the processor monitors whether the to-be-detected sample machines carry out alarming in real time and records time of sending alarming signals by the corresponding to-be-detected sample machines; and after the smoke concentration in the fire laboratory reaches the calibration value, the processor stops monitoring on the to-be-detected sample machines. According to the invention, response time of the detectors in fire sensitivity testing can be measured visually and relative proportions of differences of response time of the sample machines with different structures can be estimated. Therefore, the using frequency of the fire sensitivity test can be improved substantially and the working efficiency of research and development testing can be enhanced.

The invention discloses a method for detecting conducted susceptibility, which comprises the following steps: firstly, a conducted susceptibility testing principle model is established; secondly, an ultimate value curve is established; and thirdly, a sensitivity test is carried out by applying the ultimate value curve established in the second step. The invention can completely and accurately check a system level conducted sensitivity testing result, and can obtain the ultimate value curve and a sensitivity ultimate value electrical level, therefore, a system level conducted sensitivity test has an accurate testing basis and a testing standard, and the system level test check is more complete and accurate.

The invention discloses an automatic test method and system of receiving sensitivity. The method includes the following steps that: S100, under a current test scene, a control signal source sends test signals to a device to be tested according to preset initial maximum transmission power; S200, test data packets received by the device to be tested are put into statistics, so that receiving sensitivity can be obtained; and S300, all test scenes are traversed, so that each test scene is tested according to S100 and S200, so that receiving sensitivity under all the test scenes is obtained. According to the automatic test method and system of the receiving sensitivity of the invention, the test signals are sent according to the preset initial maximum transmission power, all the test scenes are traversed, so that receiving sensitivity testing can be performed on the all the test scenes, and the receiving sensitivity under all the test scenes can be obtained. With the automatic test method and system of the receiving sensitivity adopted, the problem of large workload of manual testing can be solved; problems caused by manual data extraction can be solved; the accuracy of test data can be ensured; and a lot of time and manpower can be saved.