Recently, APM help Korean distributor win order in automobile electronic components field by its reliable fuse test function. Thanks to the ultra fast response in current rising/drop, measurement accuracy could reach to 100us in the circumstance of stable test, which could satisfy the requirement of fast fuse verification test. Comparing with previous solution, adding electronic load to fuse test has below advantage: Less requirement to DC source, DC sources do not need to operate in extremely low voltage which make output more stable;

Semiconductor laser is the laser made by semiconductor materials which is also called semiconductor laser diode. It has advantages like small size, low weight and selectable waveform. It is widely applied in medical, manufacturing, military, automobile, RD, information technology and so on. o guarantee the reliability of semiconductor laser, it is necessary to have a standard test in advance. Due to the character of semiconductor laser, there are several requirements to DC source which used to test semiconductor laser as below: DC should operate in CC mode. Voltage should be able to self adaptive. Current must not overshoot. Once operation mode of power source change, from CC to CV, power source must shut down to protect DUT.

Audio power amplifier normally contains industrial frequency transformer, rectification and capacitor filtering and other test sector. To get better frequency response, capacity of industrial frequency transformer is produced to be high. Capacitor filtering is the same to achieve the effect of [pond". An electric company in Shenzhen used to use linear power supply to test audio amplifier test. But large size and weight, high cost, low efficiency and low power range of linear power supply has been inconformity to current test requirement. By contrast, switch power supply has smaller size, low weight and high efficiency. It has been widely used in electric product. After site test, APM DC source won the trust and selection from customer by high efficiency, stability, reliability, precision and high cost effective. APM DC source could provide stable DC output and wide range voltage and current. Current range of single unit could reach to 200A. Voltage range could reach to 800V. 1 unit could replace 3 units of rectangle power source. Support front panel and software to remote control multiple output voltage and current groups. Support setting output time; provide OVP/OCP/OPP/OTP/short circuit protection. Support list waveforms edit function. It is easy for engineer to operate to keep the test simple, fast and accurate.

After multiple test, an internationally known electric tool manufacturer start to introduce APM programmable DC E-load to the final factory test of battery pack of electric tool. Previously, customer placed some orders on APM DC source to simulate battery pack in the final factory test to handheld electric tool. Battery internal resistance simulation function Different from power source, internal resistance of battery is non-negligible. To be more close to reality, it needs to add internal resistance simulation in the test of battery pack. After test and comparison to different models of battery pack from customer, it could confirm the accurate internal resistance parameter. Then, it could adjust alarm mechanism according to test requirement. Besides, it could add password protection according to operation mode of production line and then develop a complete and reliable solution.

PCS could control the charge and discharge of storage battery to AC-DC converting. Without the condition of power grid, it could supply power to AC load. When receiving control commands via communication receiver, PCS controller will control converter to charge or discharge battery according to symbol and power value of power range command, which could realize the adjustment to grid in active power and inactive power.

APM programmable DC source is not inferior to top-ranking power source brand from China and foreigner countries via customer feedback. With the advantage of high power high current, low ripple, low noise, high accuracy, high resolution, quick response time, adjustable voltage slew, external analog control and high cost performance, APM emerges victorious in the competition with many power supply brands and win the trust of customer. One customer from Philippine, whose main business is the production of electron component, selected SP40VDC4000W and SP80VDC12000W of APM from multiple brands . It guarantee the quality of product. Customer applied external control of programmable power supply in test system. Externally input 0~5V/10V continuously or discontinuously

Recently, APM distributor in Korea won an automobile electronics components ATE system via quick response and reliability of external analog control. To better understand external analog control, let us review 3 normal control of power supply. 1. Panel control Also known as local control, it set or edit power source via button on panel or touch screen. This kind of control normally applies in bench control. 2. Remote control

This year is one of the most important years for APM. Multiple series of new products become more and more mature during this year. Most attractive products include high power DC source and DC E-load. There are up to 80 model of single unit product. At the meanwhile, it could expand to power source system and E-load system. Models expand to hundred. Customer has more selection in model based on economy, flexibility and convenience. After long term investment in R&D and test, hardware, software and function of E-load has significant improvement. Increasingly sales from customer is the widely approve to product quality and brand awareness. One of domestic famous state enterprise in aerospace industry, after selecting from several of E-load brands, finally chose APM high power DC E-load system. The whole system is built by 12 units of 7U E-load EL1200VDC13200W. Each 3 units built a cabinet. 4 cabinets could all work independently or parallel with other cabinets.

Voltage sags, short interruption and voltage change standard in IEC61000-4-11 have compulsory become the standard of CE to EMC. Voltage sags, short and short interruption are caused by malfunction of power grid and substation facilities, or great change suddenly occurs in load. In some cases, voltage sags and short interruption may occur twice or more. Change of voltage is caused by the constant change of load in power grid. APM AC source has built-in IEC test standard waveform for customer to select and output directly. Customer could change the test level according to actual situation. 1. Select Voltage Dips to Class 2, Count to three times, Frequency to 50Hz. % is the voltage reference percentage after voltage sags. Cycle is the duration of voltage sags. Start Degree is the start angle. Repeat is the repeat times of voltage sags. Interval is the time interval. 1.2 Press Diagram could preview waveform. Press save could save waveform and back to previous page and press Trigger.

Pulse refers to transitorily abrupt change of voltage or current. Common pulse shape contains rectangular pulse, square-wave pulse, sharp pulse, pulse step modulation, interval sinusoidal pulse. At the meanwhile, pulse voltage has the characteristics of mutability and discontinuity. APM programmable AC source has Pulse Mode function. It could simulate the effect of pulse voltage to equipment. It could set the parameter of pulse including voltage amplitude, frequency, duty ratio of pulse waveform, angle, and waveform category and operation time. It could test voltage drop and power grid low frequency disturb. For example, according to below setting parameter, voltage could realize the function of 2ms power off in a fixed time point when voltage output within 2s. Vac.Vdc.F:pulse waveform parameter

Application of Programmable DC source output adapter plate APM Programmable DC source successfully expand master slave control quantity to 10 units via internal CAN BUS communication. This breakthrough could satisfy more flexible extend demand from customers. All products could parallel or series connect maximum 10 units via master slave BUS connection. It could accumulate output current or voltage to become a higher power system. At the meanwhile, it could synchronously control all slave units via Master unit, operation experience of [one call, hundred response". Above operation could completely realize via panel control or monitoring software. Multiple units parallel/series connection mostly adopt cabinet system integration. Convenient cable connection could get twofold results with half the effort. APM Programmable Power Supply introduces application of adapter plate, below application of multiple units parallel connection output could tell its advantage. Output terminal single unit power supply adopt below angle could largely guarantee contact area between terminal and internal PCB board. It could satisfy the requirement of stress-strain after cable connection. When multiple units output in parallel connection, it could select output adapter plate to connect conveniently. It could change the connection direction. On the one hand, this kind of connection extends the room between positive and negative terminal which bring convenience to user. On the other hand, folding design on the bottom also makes output adapter plate easy to locate and fixed. (Noted: when connected output adapter plate, distance between positive and negative terminal is 7mm. It is still satisfy the safety interval of electric.

Now electrical equipment is increasingly rich. For different DUT like capacitive load, inductive load, battery, LED load, requirement to reliability, stability and flexibility is getting higher. To make sure the test proceed smoothly, it is necessary to have different methods to different DUT. 1. Application to capacitive load Because capacitive load has the characteristics of increasing output voltage. Especially when output voltage adjusts from high voltage to low voltage, it will cause voltage fall slowly. Thus, normally, a power resistance will parallel connect to the output terminal and a diode will series connect between output terminal and load. It could reach a good application.

In electrical faults or abnormal situation, current will constantly increase. Without protection device in circuit, increasing current causes continuously heat which may burn out circuit and even fire. Fuse, as the most important device in the protection of circuit, could protect circuit by rupturing current when fusing. Because of it, selecting a suitable power supply for fuse test appears to be more important. It could not only improve efficiency but also guarantee the accuracy of test. Below feature make APM become popular section in fuse test. Short mode

Generator is the main power of automobile which could supply electricity to all electric equipment and charge battery in functioning normally. In the test of generator, E-load should be capable of simulating electricity generation performance of generator in 4 modes from idling to full speed. During this process, it need to real-time observation to voltage and current. Traditional E-load could not match this requirement and test data is not accurate. Thus, professional E-load is necessary. There is a test to electricity generation performance of generator in automobile generator test. It requires E-load could simulate different rotate speed of generator which is necessary to get complete test result. APM DC E-load offers various operation modes for selection. For example, target at the test of electricity generation performance of generator, it is available to adopt CC mode as well as the CV mode. Both 2 modes could simulate different rotate speed which could help engineer to get complete test result. Besides simulating rotate speed, simulating the current flow through generator in different rotate speed is also an important test item. Through these two important test data, it could portray change curve of rotate speed and current which could confirm their relationship. APM programmab

All kinds of batteries could be seen in daily life. Different battery has its own capacity. Even though the same kind of battery also has different discharge current,which make it have different output capacity. Battery contains several parameters such as battery standard voltage, battery capacity, and maximum output power and so on. Most people may concentrate on battery capacity. Under specific condition (discharge rate, temperature, end voltage), power released by battery is the capacity of battery. It is normally measured as ampere-hour. APM E-load especially provides three discharge modes for battery discharge test: constant current, constant resistance, constant power mode. Through setting end voltage and end time, E-load could correctly stop loading to avoid battery damage caused by over discharge. Test procedure is as below: 1. Connection before test Connect the positive and negative terminal of battery and E-lad. Under the circumstances of high current, there will be voltage drop in cable. Current measurement value in E-load will be lower which may cause effect to measurement. To eliminate this phenomenon, it is available to use remote compensation to eliminate voltage 2. Please set the shutdown condition When testing battery in batter mode, it is necessary to set a shutdown discharge condition. APM E-load has below 4 shutdown test condition: End voltage, overtime, end watt hour and end ampere-hour. When satisfy one of four conditions, battery discharge test will shutdown. Normal test is focus on parameter setting of end voltage, end watt hour, end ampere-hour and overtime. Besides, APM measurement function includes measuring discharging capacity(WH.AH)and discharging time.

To prevent power source and DUT, power source product is designed to have a series of protection function including software protection and hardware protection. Software protection could flexibly set via menu panel but hardware protection has taken into account residual in circuit design. It is unchangeable normally. Anti reverse injection protection of power source is the special item of these hardware protection items. Due to this protection is a double-edge sword, without correct selection, it may cause damage to DUT. Some power source install anti reverse injection diode to cut off the current from DUT to power supply under some test environment. It could prevent the damage to hardware circuit of power supply. Application introduction please check picture 1&2. However, in some test field such as motor-operated test filed, if customer does not think about absorb of reverse potential in circuit design of motor-operated appliances, installing anti reverse injection diode will cut off the absorb of reverse potential. This kind of reverse electromotive force will create high voltage which may breakdown DUT. Application introduction is as pictures 3 & 4. Power supply could be applied in charge function. After charging, as picture1, because output terminal connect diode, it could stop voltage from positive and negative terminal of battery reverse injecting to power supply output capacitance. Without diode like picture 2, after charging, voltage from positive and negative terminal of battery reverse injecting to power supply output capacitance. At the meanwhile, other circuit could consume energy of battery. During the test for motor application, when power stop output, motor will produce reverse potential. If the desi

For any automatic test system, DC power supply is one of the important equipment. In this kind of application, the power supply is required to have the characteristics of high stability, high efficiency, high precision and easy to program control. Generally speaking, the Programmable Dc Power Supply in the automatic test system has two output modes: CV and CC. Under certain voltage and current parameters, the power supply will work in CV or CC mode according to the Electronic Load. When the load changes, the power supply can automatically switch between the two output modes. For example, when the voltage and current set by the power supply are 10V and 10A, and the load is more than 1 Ω, the power supply will maintain the CV output mode of 10V, and the current value is the ratio of voltage and load;when the load is less than 1 Ω, the power supply will maintain the CC output mode of 10A, and the voltage value is the product of current and load; if the load fluctuates around 1 Ω, the power supply will automatically maintain the CV and CC mode Switch. This automatic switching function of DC power supply has certain flexibility, and can maintain the Power Supply in the same output mode within a certain range of load change; and can still maintain the work within the range of power supply capacity when the load change is beyond the expected range.However, if the load has very high voltage or current sensitive characteristics, or need to ensure that the power supply works in a certain mode, this automatic switching function has limitations. For example, when testing the laser diode, it is neces

To prevent power source and DUT, power source product is designed to have a series of protection function including software protection and hardware protection. Software protection could flexibly set via menu panel but hardware protection has taken into account residual in circuit design. It is unchangeable normally. Anti reverse injection protection of power source is the special item of these hardware protection items. Due to this protection is a double-edge sword, without correct selection, it may cause damage to DUT. Some power source install anti reverse injection diode to cut off the current from DUT to power supply under some test environment. It could prevent the damage to hardware circuit of power supply. Application introduction please check picture 1&2. However, in some test field such as motor-operated test filed, if customer does not think about absorb of reverse potential in circuit design of motor-operated appliances, installing anti reverse injection diode will cut off the absorb of reverse potential. This kind of reverse electromotive force will create high voltage which may breakdown DUT. Application introduction is as pictures 3 & 4. Power supply could be applied in charge function. After charging, as picture1, because output terminal connect diode, it could stop voltage from positive and negative terminal of battery reverse injecting to power supply output capacitance. Without diode like picture 2, after charging, voltage from positive and negative terminal of battery reverse injecting to power supply output capacitance. At the meanwhile, other circuit could consume energy of battery. During the test for motor application, when power stop output, motor will produce reverse potential. If the design of motor does not think about the absorb of reverse potential, like pictures 3,

Application of AC source in LED test LED Power Driver could transfer to specific voltage and current to drive LED to light. As the LED Technology rapidly developed, requirement to LED drive power keeps improving. High efficiency, surge protection, long service life, waterproof and damp-proof have become key evaluation criterion. Thus, power modular manufacture and lighting manufacture are both pay more attention in advanced test technology and solution. LED is energy-saving product with high requirement to electric-driving efficiency. This is essential to the structure of power source installing in lamp. As luminous efficiency is decreasing with the increasing of temperature of LED, so heat dissipation of LED is necessary. The higher efficiency of power source, the lower of its loss of power. It will reduce the heat within the lamp and slow down the increasing of temperature within the lamp. At the meanwhile, it is benefit to increasing of service life. This could be realized via the adjustment of voltage and frequency in APM AC source. Simulating the change of voltage and frequency in input terminal of LED-drive power source, it could also set output fluctuation of voltage and frequency according to different requirement. Built-in high accuracy power meter could measure voltage, current, frequency, apparent power and 15 parameters. It could completely satisfy high efficiency test requirement of LED-drive power source. What is more, LED is weak in Surge handling capability especially in anti-reverse voltage capability. Strengthen the protection in this file in equally important. Some LED lamps a

There are various kinds of electric device in daily lives. Each kind of electric device needs a stable and reliable switch power supply. A good switch power supply should match the requirement of all function specification, protection characteristic, safety standard and other feature level requirement. There are numerous of test items in switch power supply. Raise and fall time of voltage is one of the test item with may requirement and it is the guarantee of key performance. Rise and fall time is a key parameter of power supply feature. Different electric device has different requirement to rise and fall time. Some electric device needs long rise and fall time, some need short rise and fall time. Generally, rise time means the time voltage raising from 10% rated voltage to 90% rated voltage. On the contrary, fall time means the time voltage dropping from 90% rated voltage to 10% rate voltage. Normally, oscilloscope is needed in testing the rise and falltime of power supply. APM E-load provides timing function which is used in testing rise and fall time. With this function, users could decide for themselves at rise time test or fall time test. Trigger voltage and end voltage could random setting. It could realize testing rise and fall time accurately in designated area without oscilloscope. It save cost and test process is simple. Voltage and current sampling frequency of APM E-load could reach to 500 kHz with high slew rate of current rising and falling.

In practical application, we often need to integrate to system and control via IPC. Thus, to communicate with IPC, it will require power supply with communication interface. In a system, when other equipment has requirement in communication, generally, communication interface of IPC should be multiple. That also requires each equipment in system to provide different kinds of communication interface for selection. To make the system operate smoothly and reduce cost, it requires communication interface of each equipment in system to be coordinated with IPC communication interface. APM programmable DC source provides 4 standard communication interfaces: RS232.RS485.LAN.USB. GPIB is optional. In practical application, it requires analog to control. It will need interface of analog control. With such interface, it is capable of setting and controlling DC output voltage and current via weak voltage, current and resistance signal. APM DC source could provide Web Server remote control function at the meanwhile. Through LAN interface and IE browser, it could remotely access and control power source. Open browser, enter IP address of power supply. It could access to welcome website. It is capable of setting and measuring current/voltage, displaying and controlling operation status of power source, activating/shutting down buzzer, current sharing, opening and shutting down power source, setting parameter, loading basic information of power source, modifying LAN communication parameter and reset password. Customer could open Programmable Power Remote Upgrade System to upgrade software of power supply. A simple operation could complete the upgrade to kernel control program and communication control program. First, install the remote upgra

In practical application, resistance in cable cause voltage drop. It will cause the voltage reach to load side different from exact demand voltage which affect the accuracy of test. This situation is common in ATE test. To make up this situation, it need to remote measurement function of Programmable Power Supply to compensate the voltage drop in cable. APM Programmable DC Source is equipped with this function with higher security and easier to operate. Under ideal conditions, there is no resistance in the cable between power supply and load. In fact, resistance in cable increasing is related to the length of cable and standard. When loop current flows through the wire, it will cause voltage drop which make the voltage of load lower than expectation. If power supply is set to output 3.3V/1A, resistance of output wire is 0.3 Ohm; there will be 0.3V voltage drop. Voltage reach to load side will become 3.0V. It make load unable to operate normally. Thus, it needs to compensate the wire. For that, customers do not need to worry about it on APM products as APM Programmable DC Source is equipped with remote compensation function. Remote compensation wire connects from power supply to load as remote compensation is high resistance circuit in power supply. Current on compensation wire is small. Voltage drop could ignore. Voltage of load could back to power supply control circuit via remote compensation wire. Power supply could adjust its output to compensate above voltage to make the voltage of load equal to setting voltage. It could reach the accuracy of test.