PEL-2000可編程直流電子負載，此電子負載可以工作在定電流、定電壓、定電阻模式下，還可模擬各種動態負載狀況，透過序列功能進行負載電壓、電流、負載的上升及下降斜率、電流準位、持續時間等參數來編輯負載波形，同時提供外部波形信號控制以及V&I監測功能，測試參數及狀態的存儲可高達120組，系統可根據自動測試需求，隨時由儀器內部的儲存單元EEPROM中呼叫出來使用。

PEL-2000系列包含兩種主控含機框PEL-2002(可容納雙模組)與PEL-2004(可容納四模組)，採用模組化設計，協助使用者保留未來可能會運用到更高功率需求的擴充性，目前提供4款負載模組分別為：PEL-2020(200W雙通道負載模組100W*2 ; PEL-2030 (280W雙通道負載模組30W+ 250W) ; PEL-2040(350W單通道負載模組);PEL-2041(350W單通道負載模組)]，以PEL-2004來代表zui多可以組成8個通道同步使用，功率範圍200W~350W，電流範圍0~70A，電壓範圍1~500V，使用者可依據實際需求，選擇的負載模組及控制模組進行組合或自組負載系統，可同步執行多組電子負載模組拉載的應用，同時每個模組採用隔離與地浮接方式，避免造成短路回路 ; 現今綠能產業蓬勃發展，PEL-2000 系列符合各式消費性電子及車用能源設備測試的需求，透過外部排線並聯控制功能，zui多可以同時控制五個主機框，並讓總體的總使用功率達到7kVA。

PEL-2000系列配備RS232、USB、GPIB(選配)接口、GO/NG接口，同時還配備了驅動程序和針對LabView、VB、C、C++等相關測試軟體範例。PEL-2000系列主要應用於多通道或單通道輸出的AC/DC電源、DC/DC電源模組、充電器及電源類電子元件性能的測試，對設計研發、生產線測試及產品檢測作業上提供快速有效的測試方案，同時具有的OPP、OCP、OVP、OTP、低壓保護以及正反向極性保護功能，更大幅提高了產品的可靠性、是工程測試及自動測試環境得以信賴的產品。

A. AUTOMATICALLY SEQUENCE FUNCTION

The Sequence function allows each channel to change its load sink according to a predefined sequence at a rate of up to 100 s per step. Each sequence is able to run concurrently, under the control of one clock. This is one of the most powerful features of the PEL-2000 Series as it is able to realistically simulate a multi-output power supply load. Under Dynamic mode, the load current or load resistance pulses between two preset levels at a pre-defined speed up to 25 s per step. This is often used as the standard test procedure to verify the response of a power supply to quick load changes. The picture above is an example of a sequence used as a load profile for a single output switching power supply. A load profile is programmed to simulate the current draw of a power supply load. By using a current probe to acquire a current waveform, the PEL-2000 is able to evaluate the performance of a power supply based on the load sequence that is programmed. An oscilloscope is then used to display the result.

B. MULTIPLE OPERATING MODE

C.C. ( Constant Current ) In Constant Current mode, a load unit will sink the amount of current programmed. Regardless of the voltage change, the current will stay the same. Two selectable ranges are available for constant current mode: High (HI) and low (LO) range. Low range has a higher resolution for high precision measurements. If the current exceeds the low range, high range must be used. The PEL-2000 Series offers the maximum rated power for the low measurement range. This unique feature enables high-resolution measurements at high voltage only if the load current doesn't exceed the rated low range level. Both static and dynamic modes are available for CC operation. Static mode can be used for stability tests and Dynamic mode can be used to test transient load performance of a power supply. Go/NoGo is supported for both high and low ranges as well as Static and Dynamic modes.

C.V. ( Constant Voltage ) In Constant Voltage mode the load unit will sink current whilst keeping the voltage constant. Under CV mode, single channel load modules support two levels of voltage (A Value, B Value) with a preset cut-off current limit. An A / B button is available on the load module front panels to switch the Constant Voltage between A Value and B Value for power supply load regulation testing. Dual channel load modules only support A Value for CV mode. To accommodate the response of a power supply, response rates during voltage transitions can be set to fast or slow under static test mode.

C.V.+C.C. ( Constant Voltage + Constant Current ) When using CV mode, a current limit can be set for CV+CC mode. If the input voltage is greater than the preset CV limit, the channel will operate in CV mode if the input current is less than the preset CC limit. When the input current exceeds the current limit, the channel will operate in CC mode.

C.R. ( Constant Resistance ) In Constant Resistance mode the load units will linearly sink current and voltage to match a set resistance. Two different CR values and two different rising and falling slew rates can be set under CR Mode for single channel load modules. Like CC mode, Constant Resistance mode supports both dynamic and static loads. As with the other modes, Go/No Go is also supported.

C. PARALLEL DYNAMIC LOADING

All the load channels in a PEL-2000 mainframe can be connected in parallel to perform any combination of static or dynamic loading. Under Dynamic mode, the load current or load resistance pulses between two preset levels at a predefined speed of up to 25 s per step. When the channels are connected in parallel, dynamic tests are synchronously clocked. The ability to perform parallel dynamic loading gives you the flexibility to perform dynamic tests to highpower power supplies without the need for a dedicated high power electronic load.

D. FRAME LINK

The PEL-2000 Series allows multiple mainframes to be linked together with standard MIL 20-pin connectors to provide higher power load capacity. A maximum of 5 mainframes maximum, including one master and 4 slaves, can be chained together to give a 7kW load capacity for high current and high power applications

E. RUN PROGRAM

Under "Program" mode, up to 12 programs each with 10 panel setup memories, can be edited to create work routines for repetitive tests. After a program has completed, the results of all test steps, including the Go/NoGo judgments will be shown on the screen. Up to 12 programs with a total of up to 120 panel-setup memories can be chained together to be run one after the other.

F. PROTECTION MODES

The PEL-2000 Series includes a number of protection modes: Over Current Protection (OCP), Over Voltage Protection (OVP), Over Power Protection (OPP), Reverse Voltage Protection (RVP), and Under Voltage Protection (UVP). The protection modes are useful to protect both the load modules and the DUT(s). A buzzer can be set for when a protection setting has been tripped. When a protection mode has been tripped, the load unit will display an alarm and stop sinking current/voltage. When a load unit is operating in CR or CV mode, the unit may need Over Current Protection to prevent excessive current being sunk. Over Current Protection stops the load from sinking more current than its recommended limit and prevents the load from burn-out damage. Over Voltage Protection is used to limit the amount of voltage sunk. If the OVP trips, the PEL-Series load will stop sinking voltage. Over Power Protection is used when the input power exceeds the specifications of the load. When OPP is tripped, the power will cease to be sunk. Reverse Voltage Protection prevents reverse voltage damage to the PEL-2000 Series up to the specified rating. When Reverse Voltage Protection has been tripped, an alarm tone will sound until the reverse voltage is removed. Under Voltage Protection will turn off the load when the voltage drops below a set limit.

G. Von VOLTAGE SETTINGS

Von Voltage is the voltage limit at which the load will start to sink current. The Von Voltage setting is necessary for some kinds of power supply if a heavy load is connected during load on. There are two operation modes for Von Voltage: Latch ON and Latch OFF. When Von Latch is set to ON, the load starts to sink current when input voltage exceeds Von, and will continue to sink current even if the voltage drops below the Von Voltage later. When Von Latch is set to OFF, the load starts to sink current when input voltage exceeds Von, but will stop sinking current when the voltage drops below the Von voltage setting. This is to prevent the power supply from running into oscillation when the output voltage goes below certain level.

H. EXTERNAL CHANNEL CONTROL

A six-pin analog control connector is available on the rear panel to externally turn a load on/off and to externally monitor the load input status of each channel, including input current, input voltage, and CC current or CV settings. The Voltage Monitor Output (VMON) and Current Monitor Output (IMON) output the load input voltage and load input current as a percentage of rating current/voltage. Where 0 volts = 0% rating and 10 volts = 100% load input rating voltage or current. The voltage monitor output is across pins 1 & 3, and the current monitor output is across pins 1 & 2. Below shows the pin configuration of the voltage and current monitor outputs.

To turn a load on, an active low voltage (0-1V) must be applied across Load On (pin 5) and GND (pin 1), similarly an active high voltage (4-5V) must be applied to turn a load off. The Load On input must be TTL.