Application of digital multimeter in industry

As one of the indispensable products in the field of electronic testing, digital multimeter has the widest application range. Digital multimeter is a measuring instrument that uses the principle of analog/digital conversion to convert measured data into digital quantities and displays the measurement results in digital form. Compared with pointer multimeters, the new generation of digital multimeters has the advantages of high precision, fast speed, large input impedance, digital display, accurate reading, strong anti-interference ability, and high degree of measurement automation. Therefore, it is widely used and favored by engineers.

The DM3000 series of high-end digital multimeters recently launched by RIGOL (Beijing Puyuan Jingdian Technology Co., Ltd.) adopts dual-mode display, with a maximum resolution of 6 1/2 digits and a waveform capture function. Its multiple standard interfaces and Ethernet interfaces have further expanded the application range and application field of digital multimeters.

Fault query helps engineers solve problems.

The data sampling rate of DM3000 is as high as 50k/s, which is the highest indicator in the industry. With this feature, continuous processes that were previously difficult to capture using digital multimeters with slower readout speeds can be completely collected.

In the field of electronic production, product production lines often experience sudden failures. It is very important for engineers to find out the cause of the failure and solve the problem in time. For example, DVD designers often encounter power burnout problems during product debugging, which causes many inconveniences to product production. Using the new A/D technology, DM3000 can achieve a readout speed of 50,000 readings/second, and can continuously send readings directly to the PC at the same speed, and the non-volatile storage reaches a storage depth of 1M bytes. Its Data Log start trigger condition has multiple settings, which is accurate and flexible. The use of true RMS conversion technology can also significantly improve the accuracy of AC voltage measurement, and it has an AC bandwidth of 3Hz-300kHz.

Using DM3000, you can use the Data Log function to collect overcharging phenomena during the power-on process, then download it to the PC using USB, and then use analysis software to display and analyze the collected points, and finally find out the cause of the failure, helping engineers solve practical problems in production. In terms of the collection and analysis of rapidly changing audio waveform data, seismic wave data, etc., DM3000 can also achieve comprehensive and accurate measurement and analysis.

Automatic measurement, unattended completion of measurement tasks

High-end desktop digital multimeters can be used as a single instrument or as a complete application system with other devices to complete various test and measurement tasks. In addition, the automatic measurement function of DM3000 also helps engineers complete product testing well.

The automatic measurement function of DM3000 is not available in other similar products. Its internal inspection expansion interface can be equipped with different matrix switching modules, and each module can be set with a different ID to facilitate the automatic configuration of the system. It supports a variety of host computer software and drivers, and can easily integrate DM3000 with the system; standard RS-232 and GPIB interfaces and SCPI programming language increase the convenience of integration. Taking the

product aging process in the production process as an example, users can use a 12-way voltage differential input inspection module and program the test program of DM3000 in advance, so that 12 independent products under test can be tested at the set time, point data can be automatically recorded, and electronic data reports can be automatically generated for production operators to check and analyze product quality and defects to eliminate unqualified products. Most importantly, the automatic measurement system configured with DM3000 does not require personnel on duty, and can realize long-term automatic monitoring and data collection of the measured object. [page]

Digital multimeter detects automobile faults

When troubleshooting the electrical part of a car, the most important thing is the reasoning process of the cause of the fault. This process is very important. This is because you cannot see the internal situation and it is impossible to disassemble a large number of components like mechanical parts. The use of logic and reasonable steps can quickly find the problem. The key tool in this process is the multimeter.

The multimeter is one of the most commonly used automotive electrical maintenance tools, used to test voltage, current and resistance. However, the input impedance of the analog (pointer) multimeter used in the early days was too low, and the impact on the electronic circuit during measurement was too large. This kind of meter mostly uses 9V voltage when testing resistance, so it is easy to damage those sensitive electronic components. But the RIGOL digital multimeter DM3000 completely avoids this situation.

Its input impedance is high, and its accuracy and safety are better than analog meters. The voltage when measuring resistance is also low, so it will not damage each sensitive component. But there is also a problem with general digital meters. It cannot display the increase or decrease of the measured reading. In the exhaust emission test and engine analysis, it will be found that the pure digital meter cannot give a stable change value. DM3000 overcomes the shortcomings of the digital meter and replaces it with an analog/digital combination meter. It has both the advantages of a digital meter and the advantages of dynamic measurement of an analog meter.

Monitoring of

base station electrical signals As a large-scale equipment, the base station needs to monitor a lot of signals. In particular, the power supply and environmental monitoring of the base station. Power supply is the basic condition for the operation of the equipment. The different environmental factors such as temperature and humidity will affect the operation and life of the equipment. Monitoring the parameter values ​​in these aspects helps to prevent and solve problems. Long-term monitoring and statistics and analysis of the saved data can provide more references for future use and subsequent development.

In the entire base station system, the power module supplies power to each module. There are four types of power supply to the board in the RF module, namely 7.2V, 5.5V, 3.3V and 2.5V, and the required accuracy is +1%. The ambient temperature of the base station room is normal when it is between 15 and 30℃, otherwise it is abnormal. The humidity of the room is normal when it is between 40% and 65%, otherwise it is abnormal. For these routine data, they can be monitored through the inspection function of the DM3000 high-end digital multimeter.

Before monitoring, the inspection platform must be built first. On the basis of achieving high-precision and high-speed measurement, the DM3000 high-end digital multimeter realizes the inspection function by connecting an inspection board and combining PC virtual inspection software. The connection between the PC and the hardware can be through high-speed USB and LAN connection. The former has the characteristics of convenient connection and high-speed data transmission, while the latter can realize long-distance data transmission and remote monitoring.

Use software to formulate monitoring tasks. There are two functional forms in the RIGOL DM3000 high-end digital multimeter inspection software, namely multi-channel multi-measurement task inspection (Scan) and high-speed single-channel large-volume data acquisition (Data Log). For current monitoring needs, the former is used. If the modification is not based on the existing task project, then a task project must be established first. When the project is established, the system will automatically establish a database corresponding to the project to store the user-customized task items and measurement data.

The base station connects the alarm box through the serial port expansion board to achieve environmental monitoring, but the DM3000 high-end digital multimeter is used to centrally monitor the power supply and environment of the base station. There is no need to add a special monitoring module to the equipment. After the equipment is changed or upgraded, there is no need to re-customize the monitoring hardware. Only the software configuration needs to be modified. This not only improves work efficiency but also saves costs.