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Multisim 12 impedance meter software#
Determine also the cable length and calculate its capacitance per unit length. With NI ELVIS, you can use 12 instruments of autonomous software by installing. The cable capacitance contributes to the scope capacitance seen by the circuit. c) Using a capacitance meter available in the laboratory, measure the capacitance of the coaxial cable connected to the scope during these measurements. Do not use resistance substitution box in this case as its capacitance may influence the measurement. These instruments can be used to measure voltages, currents, resistance.
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A resistor of a few tens of kilo ohms and a frequency of a few tens of kilo hertz is a good choice. Moreover, the voltage measured by the scope depends now also on frequency, because the ratio of the voltage divider formed by the external resistor and the scope impedance depends on frequency. Since the AC scope impedance is lower than its DC impedance (because of the parallel capacitance), use a resistor of a smaller value than in a). b) Repeat the measurement but instead of DC use a sinewave signal with a frequency at which the scope impedance is significantly different from the measurement a). Select resistance which causes the voltage to drop to about 1/2 of the voltage measured directly (without the resistance). You may use a resistance substitution box for this measurement. Apply the same method as used for the measurement of a voltmeter internal resistance. These instruments are set, used, and read just like their real-world equivalents. a) First, determine the internal scope resistance with a DC signal. NI Multisim software provides simulation-driven instruments that you can use to drive your circuit, measure the behavior of the circuit, and examine simulation results. The equations (1) and (2) can be electrically represented by an equivalent circuit. As each Z-parameter gives the voltage-current relationship, the coefficients are impedance values given in ohms. The impedance is thus frequency dependent. The Z-parameters denoted by Z 11, Z 12,Z 21, and Z 22 are the coefficients of the currents I 1, and I 2, in the two equations above. The input impedance of an oscilloscope is a complex quantity which can be represented by a resistance in parallel with a capacitance between the scope input terminal and the ground. MEASUREMENT OF THE INTERNAL IMPEDANCE OF AN OSCILLOSCOPE.