Key Features: Power Rating: 2500W (average), 4000W maximum Voltage: 1 – 200V p-p Current: Up to 100A CC, CR, CV, CP load models Dynamic loading: up to 1KHz in AC/DC mode and up to 20 KHz in DC mode Measurement: Voltage (average and peak-to-peak), current and power Large LCD displays Build-in Sine, Triangle and Square wave oscillator APG – analog programmable interface: (1) load enable; (2) external control signal input; (3) the oscillator enable Full protection: 200V peak-to-peak, maximum power and maximum current Built in a temperature detector minimize the audio noise 19” rock mount

EDR’s 82537 electronic load series is designed for a DC/AC power source, power electronic devices and component testing. The high power rating, AC/DC capability, manual and remote controls make these loads the ideal tool for testing the high power UUT such as SMR, UPS, telecommunications equipment manufacturers, power suppliers, drivers, battery and other power sources that operate from DC to 100 KHz. The load is a 19” bench top model that offers manual and full remote control for easy integration into ATE systems. An internal build-in generator produces SINE, TRIANGLE, or TOOTH waves that allow the dynamic testing of many power sources.

An AC/AC, AC/DC, DC/AC, and DC/DC power supplies have played a critical role on electronic devices. The UPEL-2500 is capable of testing all sorts of DC and AC power sources. In the constant power (CP) mode the UPEL-2500 is perfectly suited for use as a discharge load for battery testing by simulating the real discharge curve.

Specification – the basic model UPED-2500:

	Back Panel
	Fuse holder, connector rated 30A with a 3.7 Ohm current limiting resistor, connector rated at 100A with a 0.7 current limiting resistor, common connectors, and power cable
	Front Panel
	Power switch, start/reset push-button, load/current controls, external/internal load control switch, BNC connector for an external controls (0-10V), indicator LED, peak/RMS switch, voltage, power and current displays

Options:

• CR, CV and CP modes in addition to CC
• Full remote analog and logic control (DB9 connector on rear)
• A SINE, TRIANGLE and SQUARE wave generator with
  frequency control. Input terminals without a current limiting resistor
• Terminals for low voltage (2.4VDC) testing (only DC load)

Ordering Information:

Discounts are available for educational and quantity 5 or more units.
Please call for any additional requirements, such as power, voltage, current and controls.

Application specific load simulation (options)

EDR’s family of Universal Electronic Loads (UPEL) can provide constant current, constant resistant, constant voltage and constant power modes for various application requirements.

Constant Current (CC) mode - The current will remain constant no matter what the input voltage. The load only draws the current it is set for regardless of the input voltage.

Constant Resistance (CR) mode - As the voltage changes the current is adjusted so as to maintain the same resistance at all time. The current through the UPEL will change with The applied voltage I = V/R, where R is constant.
NOTE: The CC and CR modes loading simulation is helpful to test whether the output voltage of a power source remains stable or regulated under different loading current or resistance conditions.

Constant Power (CP) mode - As the voltage of the power source (Power Supply) increases the current that the UPEL draws decreases. The current through the UPEL will change with applied voltage as I = P/V, where P is constant.
NOTE: The CP mode simulation is essential for a battery discharge load.

Constant Voltage (CV) mode - For battery charges, the CV mode may help to change the output voltage of a charger and therefore can test if the battery charge has the correct charging current corresponding to its own output, or in other words, the battery voltage.

Low voltage operations
EDR’s UPEL/A is designed to test both DC and AC power sources. If your application requires testing a low voltage power supply or high speed/dynamic loading than the UPEL/D designed only to work with DC voltage must be selected. EDR’s UPEL/D uses a closed current loop design to control a number of powerful MOSFET devices in parallel to minimize the input impedance that enables the UPEL/D to draw a very high current at a very low voltage. It can draw up to 630A with a 2V input. With an internal resistance of about 0.03Ohms, the major limitation to reach the maximum current could be the resistance of the connecting wires that would be needed to connect your power source to the UPEL.
The UPEL/A works well for both AC and DC power sources but the powerful input bridge will require the testing voltage to be at least 4V.

Dynamic loading and control
Modern electronic devices operate at a very high speed and so an electronic load should be able to perform well in the transient and dynamic response of power devices. Both EDR’s UPELs (UPEL/A and UPEL/D) are capable to perform dynamic testing and the UPEL/D can be controlled by an external analog control signal, which is generated by any kind of signal or arbitrary wave-form generator. An internal (sine, triangle and square wave) oscillator allows to set a dynamic cycling up to 20 KHz.