During the measurement process, some of the DUTs are very sensitive to the noise in the DC power input. It is directly related to the accuracy of the test data or even whether the test can be performed. How to reduce the input noise as much as possible? We need to consider it in many ways. Here are the two simplest and most feasible steps we have outlined to effectively reduce the noise in the test.
First, choose a low noise power supply
Start with a clean power source and try to minimize noise. Since the noise generated by the power supply is difficult to filter out, you need to choose a pure power supply with very low noise. For example, Itech's IT6860A is a pure linear power supply series with a noise peak-to-peak value of less than 5mV and an effective value of less than 0.5mV, which can basically ignore its impact on the test. At the same time, the heat dissipation mode of the power supply is also a cause of noise. The heat dissipation of the IT6860A series power supply is based on the intelligent fan cooling. The intelligent fan will reach a certain height when the temperature of the device reaches a certain level. Start-up, this method of use not only saves energy but also further reduces noise.
Second, shield the power supply to the connected parts
Choosing a power supply with low rms and peak-to-peak output voltage noise is just a good start. Noise can also be minimized by establishing proper wire connections between the device under test and the power supply.
The connection between the power supply and the device under test is susceptible to interference and interference from different types of noise, including inductive coupling, capacitive coupling, and radio frequency interference. There are many ways to reduce noise, the most effective of which is to ensure that the wires and induction wires connected to the load are all twisted pairs, and the higher the requirements are to consider the use of shielded cables.
When using shielded cables, be sure to ground one end of the shield. As shown in the figure, one end of the shield is connected to the ground of the power supply, otherwise the grounding capacitance will increase.
Shielded wire is grounded only at one end of the cable
Looking at the above content, engineers may have certain concerns. The choice of pure linear power supply is usually large, which is not conducive to the test site arrangement, and lacks test flexibility. In fact, there are also small-volume linear power supplies on the market, just like The above-mentioned IT6860A series power supply full series only has a standard size of 1/2 2U, which can avoid the inconvenience caused by the large size.
IT6860A series power supply
IT6860A series programmable DC power supply is a very practical power supply series of Aidex Electronics. This series of power supply dual range output, one power supply can be used as two, and the power supply also has LIST function, timing output function, over voltage Protection and over temperature protection is an efficient, stable and safe linear power supply.
in conclusion
There are many ways to reduce the noise in the test. The choice of a good pure linear power supply and the correct lead connection is the most basic and effective method.
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