Pressure sensor (Pressure Transducer) is able to feel the pressure signal, and in accordance with certain laws will be converted into a pressure signal available output electrical signal device or device, pressure sensor is usually composed of pressure-sensitive components and signal processing unit. There are four common pressure sensors: strain pressure sensors, piezoresistive pressure sensors, capacitive pressure sensors and piezoelectric pressure sensors.
Covers a wide resistance test range from to GQ
Semiconductor pressure sensor is a use of semiconductor materials under the action of external forces, its resistivity will appear changes in this mechanism to detect the device, with high sensitivity, the corresponding block, good stability, easy to use features, which is widely used in a variety of industrial self-control environment, involving water conservancy and hydropower, railroad and transportation, intelligent buildings, production of self-control, aerospace, military, petrochemical, oil wells electric power, ships, machine tools, Piping and many other industries.
Semiconductor pressure sensors span a wide range of resistance values covering the Q~GQ range depending on the material. Sorting pressure sensors for different materials requires an efficient testing program.
"5-in-1" Digital Source Meter Helps Improve Test Efficiency
I-V testing involves applying a voltage or current to a device under test (DUT) and then testing its response to the excitation. Depending on the device under test (DUT), the signal level can be quite low, requiring highly sensitive sources and measuring instruments and test techniques to minimize external sources of error, and fast test speeds and high test reliability.
Typically, pressure transducer I-IV characterization requires several instruments, such as digital meters, voltage sources, and current sources. However, a system consisting of several instruments needs to be programmed, synchronized, connected, measured, and analyzed separately, which is a complex and time-consuming process and takes up too much space in the test bench. Furthermore, the use of single-function test instruments and excitation sources has the disadvantage of complex inter-trigger operations, greater uncertainty and slower bus transfer speeds.
One of the best tools for performing I-V characterization is a digital source meter (SMU). The SMU serves as a stand-alone constant voltage or constant current source, voltmeter, ammeter, and ohmmeter, and can also be used as a precision electronic load. Its high-performance architecture also allows it to be used as a pulse generator, waveform generator, and automated current-voltage (I-V) characterization system supporting four-quadrant operation.
Flexible resistance measurements with the SourceMeter SMU
Since 2015, Purcells has been committed to the research of digital source meters, and took the lead in realizing the localization of digital source meters in 2019, and successively launched high-precision digital source meters, plug-in source meters and other products, which, through the combination of different technologies, can realize the diversification and optimization of the product portfolio solutions to meet the needs of different customers from the cost to the performance, and help the users to easily solve the various problems and needs encountered in the testing of pressure transducers. Various problems and needs, such as.
(1) Real-time testing of the sensitivity of the response of multiple materials to resistive values under the same pressure conditions; and
(2) Resistance measurements in the lower and higher range spans (Q, KQ, MQ, GQ) at low voltages, requiring high input resistance of the test equipment.
(3) I/N curve scanning.
(4) The upper computer real-time display of each different varistor R/t curve, and can be recorded and archived.
common problems
(1) Is it necessary to use the 4-wire wiring method for testing?
This is generally not necessary. Pressure sensors are developed by screening out the materials that are most sensitive to pressure and studying their properties. The resistance of the pressure sensor is much greater than the wire resistance, so the four-wire wiring method is not necessary.
(2) Can a multimeter be used to test a pressure sensor?
Multimeters are generally only suitable for static testing to determine the resistance, for large range and large dynamic R&D, digital source meters are the best choice. The high-precision source meter independently developed by Purcell has the advantages of large dynamic range and high input impedance, which can cover the testing needs of pressure sensors with different resistance ranges from Q to GQ.
(3) What is the advantage of a source meter over a resistance meter?
Source meter and resistance meter can be converted to resistance by I Ⅳ measurement, but the resistance meter only supports constant-current voltage measurement mode, while the source meter supports both constant-current voltage measurement and constant-voltage current measurement mode; secondly, the minimum current of the resistance meter can only be up to the nA level, while the Purcells Digital Source Meter supports the pA level current output/measurement capability.
(4) What are the features of the multichannel R/t test upscaling software?
Support ≤ 40 channels synchronized real-time drawing R / t characteristic curve; support constant current source or constant voltage source custom linear output mode switching; resistance value range dynamic automatic change; with timed scanning and continuous test function; test frequency according to the NPLC numerical value adjustable also has adjustable multi-point data smoothing R / t curve switching; support for test data export; support for Ethernet, RS-232, GPIB fast Connection communication and other characteristics.
For a detailed test program for pressure sensors, please contact us.
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