# Circuit Diagram Of Sunwa Sp150 Multymeter

By | June 22, 2023

The Sunwa SP150 is a digital multimeter that measures voltage, current, resistance, capacitance, and frequency. It also has a few other features, such as a data hold function and a peak hold function. The circuit diagram for the Sunwa SP150 is shown below.

The multimeter is powered by a 9V battery, which is connected to the circuit through the J1 connector. The battery provides power to the microcontroller, which is responsible for controlling the operation of the multimeter. The microcontroller is also responsible for displaying the measurements on the LCD screen.

The voltage measurement circuit is located on the top left side of the circuit board. The input voltage is applied to the input terminals, and the voltage is measured by the analog-to-digital converter (ADC). The ADC converts the analog voltage signal to a digital signal, which is then displayed on the LCD screen.

The current measurement circuit is located on the bottom left side of the circuit board. The current is measured by the shunt resistor, which is a small resistor with a low resistance value. The current flowing through the shunt resistor creates a voltage drop, which is measured by the ADC. The ADC converts the analog voltage signal to a digital signal, which is then displayed on the LCD screen.

The resistance measurement circuit is located on the top right side of the circuit board. The resistance is measured by the Wheatstone bridge circuit. The Wheatstone bridge is a circuit that compares two resistances. The resistance of the unknown resistor is varied until the two resistances are equal. When the two resistances are equal, the voltage drop across the unknown resistor is zero. The ADC measures the voltage drop across the unknown resistor, and the resistance is calculated using the following formula:

R = (R1 * R2) / R3

Where:

R is the resistance of the unknown resistor

R1 is the resistance of the first resistor

R2 is the resistance of the second resistor

R3 is the resistance of the third resistor

The capacitance measurement circuit is located on the bottom right side of the circuit board. The capacitance is measured by charging and discharging the capacitor. The time it takes to charge and discharge the capacitor is measured by the ADC. The capacitance is calculated using the following formula:

C = (V * T) / I

Where:

C is the capacitance of the capacitor

V is the voltage applied to the capacitor

T is the time it takes to charge and discharge the capacitor

I is the current flowing through the capacitor

The frequency measurement circuit is located on the top of the circuit board. The frequency is measured by the timer circuit. The timer circuit generates a square wave signal with a known frequency. The frequency of the square wave signal is compared to the frequency of the input signal. The difference between the two frequencies is measured by the ADC. The frequency is calculated using the following formula:

F = (1 / T)

Where:

F is the frequency of the input signal

T is the time period of the input signal

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