Multimeter AC DC converter circuit diagram automatically

The circuit depicted in the figure illustrates an automatic AC/DC converter for a digital multimeter. Typically, standard digital multimeters require manual intervention to switch between AC and DC measurements. The new DT860D digital multimeter utilizes the NJU9207F automatic range switching chip, along with external auxiliary circuits, to facilitate automatic measurement functions for both AC and DC.

The automatic AC/DC converter circuit is designed to enhance the functionality of digital multimeters, allowing for seamless transitions between alternating current (AC) and direct current (DC) measurements without user intervention. The NJU9207F chip serves as the core component that enables automatic range switching, optimizing measurement accuracy and efficiency.

In the schematic, the multimeter is integrated with the NJU9207F chip, which is responsible for detecting the type of current being measured. This chip processes the input signal and determines whether it is AC or DC, automatically adjusting the multimeter's settings accordingly. The external auxiliary circuits play a crucial role in conditioning the input signal, ensuring that it is suitable for processing by the NJU9207F chip.

The circuit typically includes a rectifier stage for AC signals, which converts the AC voltage to a DC equivalent for measurement purposes. Additionally, filtering components may be employed to smooth the rectified output, reducing noise and improving measurement stability. The design also incorporates protection mechanisms to prevent damage to the multimeter from high voltage or current spikes.

In summary, the automatic AC/DC converter circuit significantly improves the usability of digital multimeters by automating the measurement process. This innovation is particularly beneficial in applications where frequent switching between AC and DC measurements is required, enhancing both user convenience and measurement accuracy. As shown in FIG multimeter AC/DC converter circuit automatically. Ordinary digital multimeter by manual operation to complete AC and DC measurement conversions. New DT860D digi tal multimeter NJU9207F automatic range switching chip, and with external auxiliary circuits AC - DC (AC/DC) converter automatic measurement function.