Selection of the instrument. It is the first step for maximum speed, to achieve accurate and reproducible results when you select the appropriate test equipment. When to test electronic components, it is source measurement unit (SMU) has become a mainstay for high-throughput test. SMU is dedicated DC instrument can operate as a constant current source or a constant voltage source. It is a pair of source and measure current or voltage to the terminal (read back) at the same time those terminals. Constant voltage source SMU, if it takes the current measurement through the terminal usually. A constant current through the source terminal, which it takes a measurement when the voltage across them. High Voltage Testing Set
Usually, SMU, in the test instrument current during device characterization - is configured to perform the sweep time variation of the amplitude of the current or voltage is used to measure the voltage (IV) characteristics. The stimulation source terminal pair, to the DUT, is used to measure the response, the terminal pair SENSE,: there are at least four terminals SMU.
I will lead the configuration. (Has just cause to cable), SMU, most can be used for both two-wire or four-wire measurement, however. When a large current flows and the high brightness LED, test the other components, this feature is important. These applications also, with Keithley 2651A High Power System SourceMeter ® instrument, may require, the SMU equipped with a pulse output function of up to 50A or more to be available.
When you set up the measurement of SMU, the 2-wire mode, please keep in mind that you are using a single set of test leads to both source and measure. It is 2-wire mode, but is simplified wiring, but also not included the voltage across the device under test (DUT) in the voltage measurements only, it causes a voltage drop of the test, it is the measurement error is created be. Test Lead even in high current applications and there is a possibility that the resistance and voltage drop measurement error occurs just a little big. H V Testing Set
To avoid this type of error, SMU is equipped with a 4-wire measurement mode. Supply (source, lead) in a set of lead 4-wire mode, the voltage or current to the DUT second set (SENSE is connected) while measuring the response of the DUT to the stimulus source. Because it has a very high input impedance measurement circuit associated with the sense leads is that a small current flows through these leads very much. Therefore, you will be negligible voltage drop across them, voltage measurement will draw exactly the voltage across the DUT. Insulating Oil Testers
Has been designed to 4-wire mode to avoid excessive voltage drop in the test leads due to a large current, it is possible to create a resistance measurement problems still excessive lead. For example, when characterizing the high brightness, we use the calm rather than a test of the pulse mode, it is important to obtain the shortest pulse width for the current time DC, and rising fast to minimize the self-heating of the device I LED is lit. That to minimize the resistance of the lead to obtain the fastest rise time can be achieved.
Cable inductance. By minimizing the inductance of the cable, is very important in any test pulse mode of the device. By essentially creates a voltage drop test current changes in inductance and resistance of the current changes. Inductance of the test leads have no effect on the top and bottom of the current pulse is constant, an additional voltage drop occurs between the rising and falling edges. Therefore, it is important that I use the short cable sense as well as the only low resistance, do not have a low inductance. By minimizing the resistance and inductance of the lead, it is important to obtain the shortest rise time, most undistorted, enabling high-speed, high-precision measurement.
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Usually, SMU, in the test instrument current during device characterization - is configured to perform the sweep time variation of the amplitude of the current or voltage is used to measure the voltage (IV) characteristics. The stimulation source terminal pair, to the DUT, is used to measure the response, the terminal pair SENSE,: there are at least four terminals SMU.
I will lead the configuration. (Has just cause to cable), SMU, most can be used for both two-wire or four-wire measurement, however. When a large current flows and the high brightness LED, test the other components, this feature is important. These applications also, with Keithley 2651A High Power System SourceMeter ® instrument, may require, the SMU equipped with a pulse output function of up to 50A or more to be available.
When you set up the measurement of SMU, the 2-wire mode, please keep in mind that you are using a single set of test leads to both source and measure. It is 2-wire mode, but is simplified wiring, but also not included the voltage across the device under test (DUT) in the voltage measurements only, it causes a voltage drop of the test, it is the measurement error is created be. Test Lead even in high current applications and there is a possibility that the resistance and voltage drop measurement error occurs just a little big. H V Testing Set
To avoid this type of error, SMU is equipped with a 4-wire measurement mode. Supply (source, lead) in a set of lead 4-wire mode, the voltage or current to the DUT second set (SENSE is connected) while measuring the response of the DUT to the stimulus source. Because it has a very high input impedance measurement circuit associated with the sense leads is that a small current flows through these leads very much. Therefore, you will be negligible voltage drop across them, voltage measurement will draw exactly the voltage across the DUT. Insulating Oil Testers
Has been designed to 4-wire mode to avoid excessive voltage drop in the test leads due to a large current, it is possible to create a resistance measurement problems still excessive lead. For example, when characterizing the high brightness, we use the calm rather than a test of the pulse mode, it is important to obtain the shortest pulse width for the current time DC, and rising fast to minimize the self-heating of the device I LED is lit. That to minimize the resistance of the lead to obtain the fastest rise time can be achieved.
Cable inductance. By minimizing the inductance of the cable, is very important in any test pulse mode of the device. By essentially creates a voltage drop test current changes in inductance and resistance of the current changes. Inductance of the test leads have no effect on the top and bottom of the current pulse is constant, an additional voltage drop occurs between the rising and falling edges. Therefore, it is important that I use the short cable sense as well as the only low resistance, do not have a low inductance. By minimizing the resistance and inductance of the lead, it is important to obtain the shortest rise time, most undistorted, enabling high-speed, high-precision measurement.
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