Abstract: Programmable linear power supply has the characteristics of good stability, high precision and small ripple. This paper focuses on the analysis of these advantages of programmable linear power supply such as HM8143 and how Arb. function, built-in voltmeter and ammeter can help in testing. Complete the test more efficiently.

The linear power supply firstly reduces the voltage amplitude of the alternating current through the transformer, and then rectifies by the rectifier circuit to obtain the pulsed direct current, and then filters to obtain the direct current voltage with a small ripple voltage (see the following figure). Linear power supplies have the advantages of high stability, high precision, and low ripple, which are indispensable test tools in some areas. The HM8143 programmable linear power supply is a versatile arbitrary wave power supply designed with pure linear technology. It has many advantages of linear power supply. It also has Arb. programming function, built-in 4-digit digital voltmeter and ammeter, and bipolar power supply (positive voltage). With positive current, negative voltage and negative current), electronic load, 50KHz arbitrary wave power signal source, power modulation amplifier and other functions, this power supply performs better in testing.

How can a programmable linear DC power supply improve test efficiency?

Arb. Programming features

Arb. The programming function allows the power supply to automatically or continuously output the sequence (voltage and time) edited by the tester. It can edit the voltage value and time of each single step of the sequential operation to generate various output changes and pass the built-in 4096. Point memory, generating an arbitrary wave generator of 60W power up to 50KHz. This feature improves the efficiency and accuracy of testing in more complex tests.

For example, for a car horn test, engineers need a programmable power supply to test the characteristics of the horn. The test process is generally as follows: after 10 minutes of power supply for 10 minutes, the sound quality of the horn is tested, and the test is started for 1 second and 14V. The output is turned off in 4 seconds, and the performance of the speaker is detected after 200 consecutive cycles. For example, the simulation of the car engine start-up electrical test, through the Arb.Excel waveform editor, can reproduce the voltage curve of the vehicle power grid according to DIN40839, ISO/TR7637 and ISO16750-2 standards, simulate the starting curve according to the standard in the car design. It is very useful in testing to find problems with accidental data loss due to security coded anti-theft car audio. With the HM8143 arbitrary wave function, the device is tested even under bipolar conditions such as voltage drop, spike and offload. And in ARB mode, users can change the editing waveform according to their own testing needs, and set their own Vt voltage time curve to meet a wide range of needs. If you do not have the power supply for the Arb. programming function, you need to connect the power supply to the computer and program the power supply according to the program. This increases the complexity of the test and reduces the test efficiency.

How can a programmable linear DC power supply improve test efficiency?

Before using the HM8143 power supply, it is only necessary to program the power supply according to the experimental requirements before the start of the experiment. The programming method can also be variously selected according to the actual situation, such as programming on the power supply panel or using the communication interface for remote communication. The programming operation on the computer, etc., the power supply quickly receives the program instructions compiled by the engineer, and the test such as the car horn and the motor start can be automatically performed according to the predetermined program, and the software records the voltage and current data at this moment in real time, and Displayed and recorded on the computer's software monitoring interface, which greatly simplifies the test and improves the automation of the test.

How can a programmable linear DC power supply improve test efficiency?

Low ripple

First, let's first explain the concept of power supply ripple: the AC stray component of the DC power output is called ripple and noise, or called Periodic and Random Deviations. These terms are often used interchangeably. Ripple refers to the AC cycle signal in the output. The ripple appears as a spurious response when viewed in the frequency domain. For DC-DC switching power supplies and other equipment, engineers will worry that the ripple generated by the test instrument will be superimposed on the ripple of the device under test, and the test results will be greatly deviated from the actual situation.

In this case, the HM8143 power supply can also be used for testing. Because the power supply is a pure linear power supply design, the voltage and current ripple coefficients are at least ≤5mVrms, so engineers do not have to worry about ripple superposition to affect the ripple characteristics of the device under test.

Built-in 4-digit voltmeter and ammeter to measure actual voltage and current

During the test, in addition to the power supply, voltmeters, ammeters and other instruments are required. The HM8143 power supply has a built-in 4-digit digital voltmeter and ammeter. The measurement resolution is 10mV/1mA, which can be easily achieved without any complicated settings. And accurately measure the actual voltage and current values ​​output to the load under test.

How can a programmable linear DC power supply improve test efficiency?

Precision programmable power supply with electronic load: automatic electronic load current sinking

The HM8143 power supply features a second quadrant output power/suction current load capability on two 30V channels to simplify testing and characterization of DC power supplies, battery (charge/discharge cycles), generator/motor applications. Automotive, mobile phone and power circuit designers will experience the unique value of two 60W input/output capabilities in their daily work, improving measurement efficiency.

How can a programmable linear DC power supply improve test efficiency?

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