How to make good use of the six-and-a-half-digit multimeter in your hand?
Multimeters have various measurement functions such as AC and DC voltage, current, resistance, capacitance, diode voltage drop, etc. They are the basic instruments we use to measure static parameters and are widely used in the electronics industry.
The resolution of a six-and-a-half-digit multimeter can reach six decimal places. Taking the DMM6500 as an example, if you need to measure a very small voltage value, you can adjust it to the 200mV range and test the voltage with a sensitivity of 100nV.
Use a multimeter to accurately test parameters. In addition to paying attention to the accuracy of the multimeter, its measurement skills cannot be ignored.
1. Select the four-wire method to accurately measure resistance.
DMM6500 has both two-wire and four-wire resistance test modes. When the DUT is lower than 10Ω, it is recommended to first consider the four-wire method. When connected in this configuration, the error caused by the test lead resistance in the measurement can be avoided as much as possible. The DMM6500 front and rear panel connections are both safety banana jacks. The figures below show the connection methods using the front and rear input terminals respectively.
2. Enable offset compensation
When measuring low resistance, offset compensation techniques can be used to eliminate thermal voltage errors. As shown in the figure, in the bias compensation technique, the source current is alternately turned on and off, testing the voltage in both parts. From this voltage VM and the source power for the open part of the cycle, the correct resistance can be calculated.
3. Set the sampling speed
For measurements with test accuracy as the primary purpose, on the one hand, the AutoZero function can be turned on, and on the other hand, the "integration time" (PLC) can be adjusted. The larger the "integration time" (PLC), the higher the accuracy.
