At present, the test of the power supply switching power supply using programmed test, an industrial computer and test equipment, PC software, a combination of this method can not only improve test efficiency, reduce costs, but also to accelerate the test speed, improve test accuracy and precision. Therefore, the major power companies need a more cost-effective, universal measurement device to JVC BN-V11U Battery Charger meet a variety of power supply testing. This article the RIGOL depth a number of power companies research, the introduction of the use of the RIGOL digital multimeter to improve power detection solutions, and application examples of the DM3052 digital multimeter in a well-known power companies.

Block diagram

RIGOL DM3000 Series Digital Multimeter in the basic DC voltage measurement, voltage magnitude will decay to the A / D sampling chip reference voltage of 2.5V, and then sampling will send the results to the FPGA processing, the final voltage value ; AC voltage measurement, is attenuated by a dedicated AC voltage conversion chip is converted to the corresponding equivalent DC voltage, and then measure the DC voltage to AC voltage; resistance and capacitance measurements, using a constant current source charge and discharge method, measuring the pressure drop or charging time. In addition, user-oriented operation and display part is used for processing DSP-based digital signal processing module. DM3000 Series Digital Multimeter test block diagram is shown in Figure 1.

Usually the production line to test the speed of high speed means that the product testing cycle is short, you can greatly reduce the time cost of production, and help to improve productivity. By different manufacturers multimeter to test the DM3052 digital multimeter to measure the speed of the highest compared to similar multimeter.

In the program-controlled test to measure the 24V DC voltage, for example, if the same test platform using speed measurement, the time required for similar multimeter 360ms, while the DM3052 only need to 250ms. On a test platform for measuring DC voltage, AC voltage, frequency, resistance, etc. 177 projects, and select fast, medium speed or slow the three different measurement mode, the DM3052 to complete this set of measurements only need 88s, compared to similar multimeter time of about 10s.

On the other hand, the DM3052 Digital Multimeter unique multi-range settings, fast auto to find file function to speed up the measurement speed. Automated production and testing is usually the PC software to control a test platform has closed, on the one hand, due to the instrument panel does not allow manual operation; the other hand, the project settings have the flexibility and diversity, can not tell the whole story in the software set a fixed manual range, and therefore can automatically in a timely manner is critical to find the right gear. Similar products currently on the market two drawbacks: First, the automatic searching file slow, automatically find the file timeout crash. DM3052 to solve these two problems, to find files faster than previous products, in order to measure DC voltage of 3.3mV to 5V, for example, the DM3052 is able to automatically file from 200mV to 20V files to find files and to measure stable 5V voltage, you only need 234mS, much faster than similar multimeter needs 640 ms.

Complex test requirements for power companies, R & D engineers, through trial and error, so that the DM3052 Digital Multimeter with 5 on the measurement accuracy, four and a half, three and a half of reading accuracy, corresponding to slow, medium speed and fast multiple measurement speed requirements. To use in the enterprise, for example, were fast, slow set to measure DC 48V, the time required for the same test platform for 172mS, 234mS, 438mS, production line testing, rapid measurement can greatly reduce time, can Panasonic DMW-BCG10E Battery Charger also be used to do the measurement and analysis of rapidly changing signals, but the accuracy of readings and other issues. RIGOL DM3052 Digital Multimeter technically solve this problem, fully able to meet customer requirements. To measure the 48V DC voltage, for example, the accuracy of rapid measurement and slow measurement readings were 0.0008,0.0005, and fully meet the customer test indicator (0.004).

DM3052 digital multimeter resistance to common mode interference to improve the reading accuracy. Usually the floor of the switching power supply is AC power, ground, and thus through the distributed capacitance between the device and the base plate coupled to the electromagnetic interference the input common mode interference, to the standard signal measurements. For example, in measurement with a +5 V DC signal common-mode interference, brought the interference on the DC component superimposed on the AC component of about 500mV, the signal shown in Figure 3, in the past similar products measured amplitude of the signal was such partial big. DM3052 hardware to solve this problem, avoid the impact of common mode interference.

DM3052 GPIB, LAN, RS232 and USB Device interface, has a good compatibility to meet the different interfaces of the PC communication control. Measured a switching power supply signal, the test platform to test tooling, programmable power supply, oscilloscope, multimeter, electronic load and the corresponding connection of multiple devices and equipment connected by different communication interface to the PC. So many test equipment are in working order, one of the keys is that the compatibility of the communication interface card. Industrial control equipment, or follow the beginning of the century with a GPIB interface. For this interface, the market most of the multimeter there are own GPIB interface card and the platform host compatibility problems, the IPC on the multimeter and other GPIB devices share the same bus resources conflict DM3052 in this compatibility a GPIB card compatibility testing with the manufacturers of the NI, for ADLINK no conflict through field testing in the switching power supply production lines on different platforms.

DM3052 with independent research and development, supporting the streamlining of the command protocol, command protocol and is compatible with the universal standard SCPI command protocol and FLUKE company. At present, industrial control, the rapid development of more stringent requirements on the design verification and functional testing of the switching power supply products, so the entire production line test equipment updates and automated testing platform for software upgrades, have become the urgent problem of the various manufacturers, while manufacturers more worried that once the equipment is updated, the software can not be a quick upgrade will lead to the production stagnation seriously affect production efficiency. The complete protocol compatibility in the face of these problems, the DM3052 command can greatly reduce the changes of the host computer software, easy software for quick upgrade to speed up the testing equipment replacement.

On the other hand, the DM3052 also has a command set that corresponds with a variety of functions, a reasonable command settings can improve the reading accuracy. For example, when measuring the frequency of 200kHz signals, as Nikon D3 Charger shown in Figure 4, because the signal is affected by external interference amplitude decreases the threshold is set too high, the signal is not complete. In order to accurately measure the frequency of the signal, need to adjust the scale voltage value determines the threshold value is set to change in the hardware is more complex. RIGOL DM3052 command set, speedy resolution of all the frequency measurement command ": FREQ?" Changed ": FREQ? The MID MIN" range gear set minimum 200mV, so that voltage threshold can be very convenient reset to accurately measure the signal frequency. Thus, the appropriate command set is an indispensable part of automated testing.

Several improvements in stability, the product has gone through the process from immature to mature, high accuracy and stability is often a contradiction in this process, to solve this problem, engineers in the hardware part of the development process , and gives the corresponding range of indicators, basically to meet the needs of most industrial customers, the products by the China Aerospace Technology Group, Institute of number of units of measurement.

Posted by: Bess at February 24, 2013 10:29 PM (1V6KV)

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