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 super capacitor. It is with high accuracy, high reliability and high cost-effective.
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: up to 500kW, customization available
■ Voltage range: 120V/600V/1000V/1200V, customization available
■ Multiple protections: OCP, OVP, OTP, OPP and reverse polarity warning; Comprehensive MOS protection to avoid blow-up
■ Easy expansion via multiple loads in parallel or increasing power modules
■ Distributed design, flexible power modules
■ High power density, minimizing space occupation
■ Operation modes: CC/CV/CR/CP
■ Editable Von/Voff, reducing test accidents
■ CR/CP function supported by hardware
■ Short-circuit simulation
■ Transient over-power loading capability
■ Charging & discharging control function in series mode, convenient for battery and super capacitor test
■ Built-in ESR test function
■ Convenient OCP/OVP/OPP test
■ Dynamic mode up to 20KHz, editable rising and falling slew rate
■ LCD screen for information display
■ Intelligent fan control
■ Built-in auto test function
■ Analog programming interface(APG), current monitoring interface, remote/local trigger function
■ Multiple communication interfaces: LAN/CAN/RS232/GPIB(optional)
■ Standard 19-inch 3U, available for cabinet installation
High reliability design
1) 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.
2) By distributed design, it is easy to replace or add power modules and is convenient for maintenance and power expansion.
3) N6900 is designed with power limit circuit and has fast response, which can prevent the load from being damaged due to over power.
4) 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. Max. current slew rate can be 600A /us. 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 PC 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 is used to simulate waveform. Up to 100 sequence files editing is supported. Each file can support 50 steps. In each step,users can set the on-load mode, on-load principle value, rise slew, fall slew, dwell time and inspection content.
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 DUT voltage 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.
Remote sense to improve measurement accuracy
Remote sense is also four-wire sense. When N6900 is working, it will cause a voltage drop in the leads between the DUT and terminals of N6112, which will affect the voltage measurement accuracy of the load. When working under CV, CR and CP modes, to ensure accurate measurement, it is recommended to use remote sense. During remote sensing, terminals S + and S- are directly connected to the output of the DUT, eliminating the voltage drop in the leads.
Users can control on-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.
N6900 series supports time measurement range of 0.1ms-100,000s. This feature can be used in battery discharge test, super capacitor discharge time, fuse and breaker jump time, ATX power supply and power supply voltage rise time, etc.
Equivalent Series Resistance( ESR) test(Optional)
ESR is a principal electrical parameter of battery or super capacitor. With ESR measurement, N6900 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 then 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.