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Chroma's 63800 Series AC&DC Electronic Loads are design for testing uninterruptible power supplies(UPS), Off-Grid Inverters, AC sources and other power devices such as switches, circuit breakers, fuses and connectors.

Chroma 63800负载可以模拟高峰值因子下的负载条件，即使电压波形变形，也可以用实时补偿的功率因子变化。该特殊功能提供了现实世界的模拟能力，并防止过度强度，从而为可靠且无偏的测试结果。

The 63800's state of the art design uses DSP technology to simulate non-linear rectified loads with its unique RLC operation mode. This mode improves stability by detecting the impedance of the UUT and dynamically adjusting the load's control bandwidth to ensure system stability.

Comprehensive measurements allow users to monitor the output performance of the UUT. Additionally, voltage & current signals can be routed to an oscilloscope through analog outputs. The instrument's GPIB/RS232 interface options provide remote control & monitor for system integration. Built-in digital outputs may also be used to control external relays for short circuit (crowbar) testing.

Chroma's 63800 Loads feature fan speed control ensuring low acoustic noise. The diagnosis/protection functions include selfdiagnosis routines and protection against overpower, over-current, over-voltage and overtemperature.

Chroma's 63800 AC & DC Electronic Load is designed for both AC & DC Load Simulations. Illustrated below are the various load modes which are available:

The Model 63800 AC & DC Electronic Load provides two unique operating modes for AC load simulation: Constant Load Modes and Rectified AC Load Modes. Each are described below.

Constant Load Modes

The Constant Load Modes allow users to set the following operating modes: CC, CR and CP mode. The CC & CP modes in this category allow users to program PF or CF, or both. For CR mode the PF is always set to 1. The power factor range is limited based on crest factor programmed (Shown as Figure 1). If the programmed PF is positive then the current will lead the voltage waveform and when PF is set negative, the current will lag the voltage waveform. (See below)

如图1所示，对于1.414的波峰系数，只有当输入电压为正弦波时，编程的功率因数才能为1。但是，对于2.0的CF，可接受的PF范围为0.608至0.85；对于CF = 3，然后可以将PF从0.211设置为0.6等。因此，更高的Crest因子可以实现更广泛的功率因子。

Rectied AC Load Modes

63800 AC/DC电子负载提供了独特的能力，可以为广泛的测试应用模拟非线性整流负载。有三种可用于整流负载模拟的负载模式：RLC，CP和INRUSH电流。

▲ Figure 2: Typical Rectified Circuit

图2显示了整流器输入的典型模型。在RLC模式下，用户可以将RLC值设置为100％，并模拟实际UUT的行为。图3＆4通过使用Chroma的RLC负载模式比较了实际RLC构建电路与模拟整流电路之间的电压和加载波形。在CC模式下获得的波形，具有相同的加载波峰因子，如图5所示。

▲ Figure 3: Actual RLC Circuit

▲图4：模拟RLC模式

▲ Figure 5: CC Mode

▲ Figure 6: Inrush Current Mode

对于Inrush电流仿真（见图6），63800提供了一个刷新电流模式，该模式允许用户设置启动Inrush电流的不同inrush电流振幅和电压相位角。

Chroma's 63800 DC load simulation includes four load modes : constant current, constant resistance, constant voltage and constant power as depicted below.

CC，CR，CP模式可用于调节电压测试。对于电池充电器，简历模式可能有助于检查其当前法规。许多逆变器设计，尽管其输入为直流，但显示了输入电流，并将显示整流的模式。这种独特的负载模式使Chroma 63800负载非常适合燃料电池，PV模块/阵列和电池测试。

Chroma的63800系列AC和DC电子负载包括内置的16位精度测量电路，以测量真实RMS电压的稳态和瞬态响应，真正的RMS电流，真实功率（P），明显的功率，反应力（Q），波峰因子，功率因子，THDV和峰重复电流。除这些离散测量值外，还提供了两个模拟输出，一个用于电压，另一个用于电流，作为通过外部示波器监视这些信号的方便手段。

Timing Measurement

定时参数对于许多产品（例如UPS的断路器和保险丝）至关重要。亚博app下载网址63800 AC＆DC负载还包括一个独特的计时和测量功能，以测量保险丝和断路器的行程时间或UPS（离线）的传输时间。

▲图7：离线UPS的转移时间

When the UUT, such as one shown in Figure 8, has a higher output impedance, the current waveform will not be stable without ABA. In most cases, the loading current will be oscillating and spoil the test.

▲图8：固定带宽	▲图9：与ABA
Note: A test current will be programmed prior the actual loading defined by user for impedance detection.

63800系列为高功率和三个相应用提供了平行和3相函数。63800系列中的所有模型均可用于平行和3相函数以及3阶段配置中的并行交流负载单元，为63800 Series AC负载提供出色的灵活性和成本节省。通过将交流负载单元链接在一起，并通过主单元执行所有交流负载单元的控制，使平行和3相控制变得容易。平行和3相函数的连接如图10、11和12所示。

▲ Figure 10: Parallel connection

▲ Figure 11: Parallel/3-Phase Y connection

▲ Figure 12: Parallel/3-Phase Delta connection

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