CN205301405U - Novel digital power frequency virtual value multimeter of low -power consumption - Google Patents

Abstract

The utility model discloses a novel digital power frequency virtual value multimeter of low -power consumption, including multimeter casing and internal circuit. The upper portion of multimeter casing front panel is equipped with the display screen, and the middle part is equipped with solar cell panel, and the lower part is equipped with the pen -shape metre jack that is used for gathering voltage signal, current signal. The internal circuit includes voltage changer, current transformation ware and microprocessor, voltage changer and current transformation ware and pen -shape metre jack connection, and voltage changer and current transformation ware are through handling circuit connection microprocessor, and microprocessor is through showing the circuit connection display screen. The great simplification of novel digital power frequency virtual value multimeter of low -power consumption circuit design for this multimeter has small convenient to carry, advantage that the operating procedure is simple, but wide application in fields such as scientific research, teaching experiment, instrument and meter measurement, domestic appliance maintenance, outdoor circuit maintenance.

Description

A new low power consumption digital power frequency effective value multimeter

technical field

The utility model relates to an electrical measuring instrument, in particular to a novel low-power consumption digital multi-purpose meter for effective value of power frequency.

Background technique

Due to the development of industrial production and the improvement of people's living standards, various electrical equipment has increased sharply, resulting in a double increase in civil and industrial electricity consumption, and the quality of power supply of the power grid has become a practical problem. The voltage at the front end of the power supply network is relatively high, while the voltage at the end is relatively low, which will cause adverse effects on electrical equipment under certain circumstances. Some electrical equipment will also cause serious interference to the power grid, making some equipment unable to work normally. Therefore, there is an urgent need for a multi-functional smart meter that can fully reflect the electricity consumption situation. It can not only measure voltage, current, power and power factor, but also have corresponding leakage, overload, overvoltage, undervoltage protection and alarm functions. For industrial power consumption, functions such as harmonic analysis and data communication are also required.

Digital multimeter, also known as digital multimeter, is the most commonly used and most effective digital instrument in electronic measurement and maintenance work. Existing digital multimeters generally do not have power frequency parameters, and digital multimeters with power frequency parameters are generally large in size and expensive, and complex and large-range switching is required during the measurement process. In scientific research, teaching experiments, instrumentation In terms of measurement and maintenance of household appliances, it is inconvenient to use.

Utility model content

In order to solve the deficiencies of the prior art, the utility model proposes a new low-power digital power frequency effective value multimeter, which adopts the following technical scheme:

A new type low power consumption digital power frequency effective value multimeter, comprising a multimeter casing and an internal circuit, the upper part of the front panel of the multimeter casing is provided with a display screen, the middle part is provided with a solar panel, and the lower part is provided with a Test lead jack for collecting voltage signal and current signal;

The internal circuit includes a voltage converter, a current converter and a microprocessor, the voltage converter and the current converter are connected to the test lead jack, the voltage converter and the current converter are connected to the microprocessor through a processing circuit, and the microprocessor displays Circuit connection display.

Preferably, an image acquisition module is arranged on the rear panel of the housing of the multimeter.

Preferably, an RS485 expansion interface is provided on the side panel of the housing of the multimeter, and the RS485 expansion interface is connected to the microprocessor through an expansion circuit.

The new type low power consumption digital power frequency effective value multimeter also includes a wireless transmission module.

Preferably, the solar battery panel is connected with a storage battery, and an ordinary rechargeable battery is also arranged in the casing of the multimeter.

The beneficial technical effect obtained by adopting the above technical scheme is:

An image acquisition module is arranged on the rear panel of the housing of the multimeter. If the new low-power consumption digital power frequency effective value multimeter is used in the electric power maintenance operation process, it will be convenient for the maintenance personnel to record the fault conditions.

The side panel of the multimeter housing is provided with an RS485 expansion interface, and the RS485 expansion interface is connected to the microprocessor through the expansion circuit. The extended printing interface can be connected to a printer to output paper results, which is convenient for operators to record and file.

The solar battery panel is connected with a storage battery, and an ordinary rechargeable battery is also arranged in the housing of the multimeter. It can make full use of solar power to save electricity cost, especially for long-term application in outdoor detection. And there is no conflict between the two, and they can replace each other.

The new low-power digital power frequency effective value multimeter greatly simplifies the circuit design, making the multimeter have the advantages of small size, easy to carry, and simple operation steps. It can be widely used in scientific research, teaching experiments, instrument measurement, household appliances, etc. Maintenance, outdoor circuit maintenance and other fields.

Description of drawings

Figure 1 is the front view of the new low-power digital power frequency effective value multimeter.

Figure 2 is a side view of the new low-power digital power frequency effective value multimeter.

Figure 3 is a block diagram of the voltage and current processing circuits in the internal circuit.

detailed description

In conjunction with accompanying drawing 1 to 3, the specific embodiment of the present utility model is described further:

The utility model relates to a new low-power consumption digital effective value multimeter of power frequency, which includes a casing of the multimeter and an internal circuit. The upper part of the front panel of the multimeter housing is provided with a display screen 2, the upper part of the display screen is provided with an illumination device 1, the middle part is provided with a solar panel 3, and the lower part is provided with a test lead jack 4 for collecting voltage signals and current signals.

As shown in Figure 3, the internal circuit includes a voltage converter, a current converter and a microprocessor. The processor is connected to the display screen through the display circuit. The new low-power digital power frequency effective value multimeter converts the power frequency signal with high actual voltage (current) into two small signals with amplitude within a certain range (easy to collect), and amplifies the signal to 2.5-4V range. Then the ADC is controlled by the microprocessor (MCU) to sample at equal intervals (Fs=1600Hz), and the front end is added to sample and hold to improve the accuracy. Collect two cycles, a total of 64 points, use the microprocessor to analyze the signal spectrum, get the value of each power frequency parameter through data analysis, and then send it to the display screen for display.

An image acquisition module 6 is arranged on the rear panel of the multimeter housing. If the new low-power consumption digital power frequency effective value multimeter is used in the electric power maintenance operation process, it will be convenient for the maintenance personnel to record the fault conditions.

The side panel of the multimeter housing is provided with an RS485 expansion interface 5, and the RS485 expansion interface is connected to the microprocessor through an expansion circuit. The extended printing interface can be connected to a printer to output paper results, which is convenient for operators to record and file.

The new low-power digital power frequency effective value multimeter also includes a wireless transmission module 7 . The wireless transmission module includes 433M wireless transmission, GSM wireless transmission module and wireless receiving module. It is convenient for the operator to upload the real-time measurement data to the host computer (computer and mobile phone) to record the on-site information in real time, providing the possibility for real-time monitoring and online operation.

The solar battery panel is connected with a storage battery, and an ordinary rechargeable battery is also arranged in the housing of the multimeter. It can make full use of solar power to save electricity cost, especially for long-term application in outdoor detection. And there is no conflict between the two, and they can replace each other.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that any person skilled in the art can make all the Equivalent substitutions and obvious deformation forms all fall within the essential scope of this specification and should be protected by the utility model.

Claims (5)

1. a Novel low power consumption Power RMS DMM, it is characterized in that, including multimeter housing and internal circuit, the top of described multimeter housing front panel is provided with display screen, middle part is provided with solar panel, and bottom is provided with the test pencil jack for gathering voltage signal, current signal;

Described internal circuit includes voltage changer, power pack and microprocessor, voltage changer and power pack are connected with test pencil jack, voltage changer and the treated circuit of power pack connect microprocessor, and microprocessor connects display screen by display circuit.

2. a kind of Novel low power consumption Power RMS DMM according to claim 1, it is characterised in that described multimeter shell back face-plate is provided with image collecting module.

3. a kind of Novel low power consumption Power RMS DMM according to claim 1, it is characterised in that described multimeter housing side panel is provided with RS485 expansion interface, and RS485 expansion interface connects microprocessor by expanded circuit.

4. a kind of Novel low power consumption Power RMS DMM according to claim 1, it is characterised in that also include wireless transport module.

5. a kind of Novel low power consumption Power RMS DMM according to claim 1, it is characterised in that described solar panel is connected to accumulator, is additionally provided with rechargeable battery in multimeter housing.