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Oscilloscope Voltage Measurement
Published in John G. Webster, Halit Eren, Measurement, Instrumentation, and Sensors Handbook, 2017
The digital oscilloscope or digital storage oscilloscope (DSO) differs from its analog counterpart in that the input signal is converted to digital data and therefore it can be managed by an embedded microprocessor. The waveform data can have correction factors applied to remove errors in the scope’s acquisition system and can then be stored, measured, and/or displayed. That the input signal is converted from analog to digital and manipulations are performed on it by a microprocessor results in people not having a good mental model of the digital oscilloscope’s operation. This would not be a problem except for the fact that the waveform digitizing process is not totally free from errors, and a lack of a correct mental model of the scope’s operation on the part of its user can increase the odds of a measurement error. To make matters worse, various manufacturers of these products make conflicting claims, making it easy to propagate incorrect mental models of the digital scope’s operation. It is the intention of this presentation to give the information needed to create a mental model of the operation of these devices that enable the user to perform error-free measurements with ease.
Virtual instruments
Published in Mike Tooley, PC Based Instrumentation and Control, 2013
Unlike a conventional oscilloscope which is primarily intended for waveform display, a computer-based digital storage oscilloscope (DSO) effectively combines several test instruments in one single package. The functions generally available from a DSO include: waveform display;precise time and voltage measurement (using adjustable cursors);digital display of voltage;digital display of frequency and/or periodic time;frequency spectrum display and analysis;data logging (i.e. storage of waveform data for later analysis);ability to save/print waveforms and other information in graphical format (e.g. as .jpg or .bmp files).
Performance Evaluation and Filter Design Aspects of Single-Phase Inverter under Different Loading Conditions
Published in IETE Journal of Research, 2020
Pritha Roy, Jitendra Nath Bera, Gautam Sarkar, Sumana Chowdhuri
A block schematic and the prototype of the hardware of the proposed system are shown in Figures 14 and 15, respectively. The inverter is tested with a low voltage DC supply (30 V) to check its control functionality. Output of the inverter is connected with the LC filter. Capacitor current and the output voltage are sensed by using the CT and VT, respectively. DSPIC30f4011 microcontroller provides all the control actions by generating the SPWM trigger pulses for both bipolar and unipolar modulation schemes. The output voltage and the capacitor current are fed back to the microcontroller after passing through the respective signal conditioning circuit (SCC). The gain of the SCCs are so adjusted that the amplitude of feedback signals are within the ADCs input voltage range. The onchip10 bit ADC of the microcontroller converts these signals to corresponding digital values and the programme logic utilizes these values to generate trigger pulses after performing the corresponding PI and PR control actions. The input DC voltage and the set point are also fed to other ADC channels which are essential for the control actions. Digital storage oscilloscope (DSO) is utilized to capture the current and voltage waveforms and generates the data for analysis purposes. Various waveforms and test results are shown in Figures 16 and 17. Figure 16 shows the FFT of output voltage at 5 kHz switching by using the bipolar modulation technique. The occurrences peaks of harmonics are at 5 kHz, 10 kHz, 15 kHz and so on and it satisfies the theoretical derivation for harmonics in bipolar modulation. The THD level is observed (as estimated from DSO Data) as 2.3% and 11.95% using PR and PI control schemes.
Study of Solar PV Panel Under Partial Vacuum Conditions: A Step Towards Performance Improvement
Published in IETE Journal of Research, 2022
Ankur Kumar Gupta, Yogesh K. Chauhan, Tanmoy Maity, Ria Nanda
The rheostat has been used as a load. The thermostat has been used for temperature measurement. The digital storage oscilloscope (DSO) is used for current and voltage measurement. For current measurement, the drop has been carried out across the standard resistor of 1 Ω and measured by using the DSO second channel. The voltage has been measured on DSO first channel. Two pressure gauges have been used in the experiment for verification. One is connected to the chamber and measuring inside pressure of chamber, and the other is connected with the compressor to measure the chamber’s vacuum. The rating of the solar panel is given in Appendix B.