N6900 Series Distributed High Power DC Electronic Load
N6900 series is developed based on NGI's years of experience in testing for power supply, battery, generator and supercapacitor. It is with high accuracy, high reliability and high cost performance. According to the features of high voltage & power DC electronic loads with complex structures, harsh operating environments, high reliability requirements, and inconvenient maintenance, NGI has made a number of optimization based on the international advanced technology.
■ Power range: 0-51kW
■ Voltage range: 0-120V/0-600V/0-1000V/0-1200V
■ Current range: 0-2000A
■ Operation modes: CC/CV/CR/CP
■ Transient over-power loading capability
■ CR/CP function supported by hardware
■ Voltage/current accuracy: 0.05%+0.05%F.S.
■ Charge test, Discharge test and OCP test
■ Editable rise and fall slew rate
■ Short-circuit simulation
■ Programmable sequence test function(SEQ), up to 100 groups sequence files, up to 50 steps per file
■ Editable Von/Voff
■ Comprehensive MOS protection
■ Multiple protection: OCP, OVP, OTP, OPP and reverse polarity warning
■ Analog programming interface(APG), current monitoring interface, and remote/local trigger function
■ Multiple communication interfaces: LAN/RS232/CAN
Functions & Advantages
High reliability design
N6900 series has a comprehensive MOS protection circuit. No matter how much MOS is damaged, it will not cause short-circuit between the positive and negative polarity or the positive polarity and the control circuit. The damage of some MOSs does not accelerate the damage of others, which can be used continuously.
■ By distributed design, it is easy to replace or add power modules and is convenient for maintenance and power expansion.
■ N6900 is designed with power limit circuit and has fast response, which can prevent the load from being damaged due to over power.
■ N6900 adopts shielding technology, which has wide adaptability to harsh test environment, and improves the anti-interference ability.
N6900 series supports two modes for short circuit: manual and lock.
Manual: N6900 will be short-circuited when Short button is pressed. It will stop short-circuiting when button is released. Manual mode is suitable for debugging or R&D, avoiding measurement accidents due to misoperation.
Lock: N6900 will keep short-circuiting when Short button is pressed.It will stop short-circuiting when the button is pressed again. Lock mode is suitable for long-time short-circuit test.
N6900 series provides three options for dynamic: continuous, toggle and pulse. The dynamic rate is up to 20kHz and can be adjustable.
This function is often used to test power supply transient performance,battery protection board protection performance and battery pulse charging.
Transient over-power loading capability
In transient high power applications, users do not need to select models according to the Max. power. Take DC motor start-up simulation for example. The transient power at start-up is usually several times of the rated power. It can also test the transient overload performance of power supplies and the transient high-power discharge of power batteries.
Adjustable CV loop feedback speed
Different voltage response speeds are required in different power applications. When the electronic load does not match with the power supply in response speed, it will reduce the measurement accuracy, and even cause unsuccessful test.
On both LCD and application software, N6900 provides three options for voltage response speed: high, medium and low,which can match various power supplies. It can not only improve the test efficiency but also reduce the cost.
Auto test function
The auto test can be used to simulate waveform. This function can improve the test efficiency and can be achieved by SEQ function on the menu. Up to 100 sequence files editing is supported. Each file can support 50 steps.
OCP( over current protection) test
During OCP test, N6900 will load under CC mode and check whether the DUT voltage is lower than cut-off voltage. If lower, N6900 will record the present loading current as the test result and shut the input to stop the test. If the DUTvoltage is higher than cut-off voltage, N6900 will increase the loading current until the DUT voltage is lower than cut-off voltage or it reaches the Max. loading current.
Users can control load voltage and current via external analog input. 0-10V input through the external programming interface corresponds to 0-full scale output on the load.
0-10V analog output at the current monitoring output terminal corresponds to 0-full scale current. Users can use a voltmeter or oscilloscope to monitor the current variation.
Equivalent Series Resistance( ESR) test (Optional)
ESR is a principal parameter of battery or supercapacitor. N6900 series offers professional ESR measurement function,which can support multiple measurement standards, and possess the advantages of accurate results and stable repeated results.
The ESR measurement function absorbs current from the DUT under CC mode. When the current changes, the NGI internal resistance sensing circuit can accurately capture the voltage drop of DUT and calculate ESR value.
Charge& discharge test
Users can set different conditions on the front panel to meet their test demands. For example, when battery voltage is lower than initial voltage, N6900 internal counter will start counting. The counter will stop working until the battery voltage drops to cut-off voltage.