At this point in the measurement system, waveform data from the modules is used to calculate any power quality parameter desired. Some of these calculations are fairly simple while others are complex calculations aggregated over several cycles, seconds, or minutes to determine the ultimate quality. ...
In the cases of two boards, the overall rms noise increases in tandem with the input. This can be due to two key factors: (1) As the input (VIN) increases, the ratio VIN/VREFincreases, leading to a greater contribution of VREFnoise to the overall system noise, and (2) the inp...
The PFC controller senses the AC input voltage, inductor current and PFC output voltage. These sensed signals need to be clean; otherwise, they will affect THD. For example, because the AC input voltage signal generates a sinusoidal current reference, any spikes on the sensed signal will cause ...
Power supply modulation is achieved by combining the input ripple signal with a clean dc voltage using a line injector/coupling circuit. Supply ripple is injected as a sine wave signal from the signal generator to the power supply pin. The sine wave modulated into the RF carrier creates ...
A LED indicator is also a useful thing to have. Add it to the output of the power supply, so when you power the speakers, LED will glow. Check thisinstructableto find out how to calculate the resistor value for your LED. Most pre-assembled amplifier boards have a potentiometer for volume...
where with a0I noted the DC offset. Applying the RMS definition, the RMS squared can be written as: (9) Let’s calculate the integral. (10) (11) (12) (13) (14) Therefore, the RMS value of a sine wave with a DC offset is given by the following expression. ...
1 MHz sampling frequency, two single ended or one differential signal (ADC1 and ADC2 pins), embedded channels for temperature and battery voltage sensing, embedded digital filter with down sampling. The embedded digital filter can be used to process the PDM st...
When you connect a low ohm resistor in parallel with a circuit, the current flows through the shunt resistor -R- and generates a voltage drop. Typical shunt measurement hook-up in a simple circuit We can measure this drop and applyOhm’s lawto calculate the current. ...
The current drawn from the mains then becomes a series of narrow pulses whose amplitude is five to ten times higher than the resulting DC value. Many drawbacks result, such as a much higher peak and RMS current down from the line...
VM Figure 13: Equivalent diagram to calculate the measuring resistance, RM Example 3: Measuring current higher than the maximum value given in the datasheet LEM datasheets indicate the transducer operating conditions, with a measuring range that is generally limited to 150 to 200 % of the nominal...