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Capacitance and Capacitance Measurements
Published in John G. Webster, Halit Eren, Measurement, Instrumentation, and Sensors Handbook, 2017
Trimmer capacitors are used for coil trimming at intermediate radio frequencies. They can be air-spaced rotary types (2–100 pF), compression types (1.5–2000 pF), ceramic-dielectric rotary types (5–100 pF), and tubular types (up to 3 pF).
Resistors
Published in Adrian Waygood, An Introduction to Electrical Science, 2013
A variation of the variable resistor is the trimmer resistor. A trimmer resistor is found in many electronic devices, and is preset to a particular value of resistance by the manufacturer – in other words, it’s not intended to be adjusted by the end user.
Experimental Simulation of Decay Heat of Corium at the Lava-B Test-Bench
Published in Nuclear Technology, 2023
M. K. Bekmuldin, М. K. Skakov, V. V. Baklanov, А. V. Gradoboev, A. S. Akayev, K. O. Toleubekov
The method for conducting the calibration experiments was as follows: A heated graphite cylindrical block simulating the melt of core materials was placed in a special experimental section of the Lava-B test bench. The experimental section was a concrete trap mounted in a cylindrical inductor. Figure 3 shows a graphite block mounted in a concrete trap during the calibration of the induction system.A series of experiments were conducted on heating a graphite block in a concrete trap using an induction heater. The difference between the experiments from each other was the use of different capacitances, a capacitor bank of an oscillatory circuit, and different electrical power supplied to the inductor using a frequency converter. Thus, the operability of the system was checked and the maximum possible efficiency was determined. The capacitor bank of the Lava-B test bench included nine main capacitors and one trimmer. A post-experimental analysis of the results obtained and the determination of the most optimal parameters of the induction unit was conducted by comparing the dynamics and heating efficiency of the graphite block in the various experiments. The parameters of the unit during calibration experiments are given in Table I.Chromel-alumel cable-type thermocouples were used as the main means of measuring temperature in a graphite block. Figure 4 shows the layout of such thermocouples in a graphite block. The red dots in the figure on the left indicate the locations of the holes for the thermocouples (top view), and the yellow lines indicate the depth of their location in the graphite block.An indirect method of determining efficiency, or the so-called calorimetric method,[31] was chosen to calculate the efficiency of induction heating.