The circuit described below was used for the U6 model, the U12 circuit was the same, using equivalent voltage generation and measurement terminals. The voltage was supplied from the output terminal of the DAC0 digital-to-analog converter and applied to the series circuit consisting of the DUT, a shunt resistor and a ground terminal. The shunt resistor was a resistor of known value used to measure the current in the circuit, as the LabJack had no built-in capacitance for such measurement. This was done by measuring the voltage across it using the analog input AIN1, relative to ground. From this voltage, Ohm's law was then used to calculate the current. The voltage across the DUT was measured similarly using AIN0 and AIN1. The voltage was stepped down on each component as described by Kirchhoff's series circuit law. In the first case it was established that to apply the maximum possible voltage on the device under test it was necessary to reduce the shunt resistance to a minimum. However, too large a variation between the two resistors resulted in a decrease in voltage resolution. Conversely, increasing the shunt resistance to a value equivalent to or greater than that of the device under test increased the voltage resolution, but at the cost of a reduced maximum voltage that may have fallen across the DUT. Furthermore, a problem that occurred primarily when using the U12 model was that, due to the lower input impedance, the total series resistance of the circuit was too low (this problem was first encountered when using a shunt from 1 Ω and an 11 Ω DUT was measured) results in a lowering of the possible current resolution of the installation below the size of the increments are passed through the circuit. These effects could be compensated by... middle of paper... the manufacturer), using a 10KΩ shunt resistor taken at room temperature. Figure 8 - 1.8 KΩ I(V) Resistor Characteristic using a 10 KΩ shunt resistor taken at room temperature. The gradient of this graph provides; via ohms law, an average resistance of 1.75 KΩ, well within the manufacturer's tolerance and within 3% of 1802±0.005 Ω measured using a professional multimeter. It is worth noting, however, that while the average resistance value corresponded well to the measured values, the initial data points during the scan give a variation from this average of up to 40% and therefore a long scan is required for this characteristic even so linear. resistors. The voltage drop across the device under test was largely determined by the relative resistances in the circuit, so the functions outlined in Sections 3.1 and 3.2 are integral to this calculation.