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close channels 2 and. . Switch Topologies, a switch topology is an organizational representation of the channels and relays in a switch module. . However, with mid- andlow-level capacitance measurements, parasitic offsets can significantly affect results, and the MUX topology may no longer be the best option. NI switches have several connectivity options, including front-mounting terminal blocks and cables. . For a low-level capacitance measurement system you should choose either spdt or matrix switches, which allow a ground connection to the channels that are not being measured. Unwanted parasitic capacitances exist in every test system, but compensation can be performed to minimize their effects. . The NI 4072 has a preset aperture time that it uses during capacitance measurements. . For example, a DMM/switch setup made to measure six 10 pF capacitors using the NI PXI-2566 spdt switch module was successful in achieving.1 pF noise-free resolution. . Selecting Hardware, one option for the capacitance measurement device is the NI PXI-4072 (NI 4072). . Instead of placing switch channels in parallel, another configuration option is to arrange the switches in a tree structure to prevent the parasitic capacitances from adding. . However, keep in mind that higher path resistance switches can be used as long as a short compensation is performed. These additional components add parasitic capacitance which can cause undesirable error in the measurement. . Shielded cables can be used for all channels to reduce the effect of noise and channel-to-channel capacitance. . Spdt switches can be used to create systems requiring the most stringent resolution requirements since the offset capacitance that needs to be compensated out is typically lower, especially if using a tree structure. Open/Short compensation is useful if you assume that your system error is a combination of many different test fixture residuals. . Neighboring Capacitors and the Multiplexer Topology When capacitive DUTs are connected to multiple channels in a MUX topology, performing Open compensation becomes a more involved procedure when low capacitance measurements are being taken. Understanding Switch Topologies at m/zone or the NI Switches Help. Use, relays with Low Minimum Current and Low Path Resistance Specifications. This spdt system can be expanded to employ multiple NI PXI-2566 modules, and each configured to form a 16x1 MUX, and cascade them to create a 256 channel switching system. Although the MUX topology will not provide an accurate low-level Open compensation, spdt and Matrix topologies will. Isolation and cabling, arrange switch channels in a manner that reduces the amount of capacitance that needs to be compensated by the DMM. . For example, with high-density NI PXI and scxi switch modules, you can automate the connection of one NI 4072 to hundreds of DUTs. . Due to the series channel-to-channel parasitic capacitance, CP2 and CP3, every DUT that is not being measured, C2 and C3, is in parallel with the DUT being measured,. Switch modules that have low minimum current specifications should be used to maintain consistent signal integrity. One or more switch modules configured in a variety of topologies is necessary to provide your systems required connection points and functionality. .
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Conclusion The NI 4072 provides very accurate capacitance measurements at a very affordable price. Which can homework create a bulkier test fixture. Cp can easily reach the uF range in a large switching system if certain precautions are not taken into account 05, recommendations When setting up a system for low capacitance measurements. But it results in the summation of parasitic capacitances and a higher probability of measurement error. Switches to route signals from a test fixture to the measurement device. After selecting a capacitance measurement device. The recommended techniques and specialized configurations in this tutorial can then be employed to achieve the desired results 000 uF and can measure with a resolution as low. CapacitanceInductance Measurements at mzone or the nidmm Help File.
Andy Lee and Kelvin Yau # # Modifications for R by Dave Atkins # # For relevant papers, see Drs.Complete coverage of the.
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Noise and other environmental factors can result in measurement error. Minimize cable length, thereby improving system performance while reducing the thesis grading university of the pacific cost of an automated test system. And number of DUTs, in most ATS applications the DMM will be connected to the DUT through cables. Dictate the equipment and cabling that can be used within the ATS. And the ability to programmatically connect a high number of channels to a minimal number of test instruments. It is important to shield different sections of channels from one another. Terminal blocks, speed, and multiple modules can be expanded to the appropriate number of rows and columns. Switch Module Recommendation Depending on the capacitance measurement accuracy requirements. Visit mswitches, there are three common topologies used for switching capacitance measurements. Noise and Averaging, nearly every ATS application uses some type of switching.
Spdt and Matrix topologies provide system configurations that assist in limiting parasitic offsets when performing mid to low-level capacitance measurements.By averaging more samples together in the driver, you can reduce the effect of noise on your signal.