Answers to Electronic Load Questions 
Executive Engineering at Exec-Eng.Com



  • Can I use a computer to control a dc current source, connected to the load?
    Yes you can! Note: If you use this to control the electronic load, there is NO Automatic Power Control in the electronic load, you are now doing that, and their is no time delay at startup, or thermal limit switch shut-off if the load over heats.
  • Can I run the load in true constant current mode?
    Yes! but you will have No Automatic Power Control or Startup Time Delay. This requires a computer & software.
  • How much current can the CMCS
    (current monitor / current share) supply?
    The maximum load should be no more than a 4.0 K ohms. About 3 - 4 ma.
  • What is the maximum size of the timing capacitor?
    The size is not the problem the leakage is. The maximum leakage can be no more than about 50 uA and still work well. The leakage is a factor in the timing circuit, and when using very large capacitors may be more of a factor for timing.
  • Should I use All of the Current Input Pin when connecting the load?
    In most cases yes. Each input pin is designed to handle about 45 Amps, also by using more than one pin your total input load resistance will be lower. This can be very important to low voltage power supply sources. Otherwise you may not be able to get the maximum current that you desire.
  • What is the maximum on resistance of the electronic load?
    This depends on the load model. The on-resistance is measure with the electronic load at full current. The on-resistance is what limits the amount of current the electronic load can sink. 
  • Can I use the electronic load below 2 volts?
    Yes. But remember you will need very large gage wire to get large currents to the load... in fact the gage of the wire may be more of a limiting factor to current than the electronic load is.
  • Can I put a short circuit switch across the electronic load?
    This is not recommended, most of the time you will have transients that exceed the input voltage rating of the electronic load. This is especially true with higher voltages. This may cause the electronic load to be damaged.

    Our suggestion is have a separate load control switch that switches the power source away from the electronic load, and switches it to the shorting switch in use only. Remember switch both the positive and the negative return lines, not just one line to the shorting device.
  • Are the main power input terminal made to be soldered to?
    Yes, the terminals can be soldered to, you may have to use a high heat soldering iron.
  • Can I use two different type Electronic Load Blocks
    in current sharing?
    Answer; NO you can only use the same type load block when current sharing.



Executive Engineering Home

Terminology of Electronic Loads

Current Ctrl of Electronic Loads

Powering the Electronic Loads

Heat Sinks for Loads

Using DtoA's & AtoD's

Selecting an Electronic Load




Computer Operation

Constant Current Mode

Current Monitor & Share

Startup & Slew Rate

Power Terminal of Load

On Resistance of Load

 Low Voltage Operation

Short Circuit Current

Soldering Terminals

Load Model Number