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Discounts are available for educational and quantity 5 or more units.
Please call (502)933-8660 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.
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.
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.
To request addition information about this product or another OEM product by EDR
please fill out the
Product Request Form or call us at 1-502-933-8660