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DC Power Supplies

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Using the SPD3303X and SPD3303X-E Timer Function

Jim Wilson

Last Update hace 7 meses

The Timer feature on SPD3303X and SPD3303X-E power supplies makes it easy to create voltage and current output profiles as a sequence of up to 5 steps. For each step of the sequence, one can specify a voltage, current, and duration.

The first part of this article describes using the timer from the front panel of the power supply. The second part explains remote operation of the timer with Siglent's EasyPower software.


Channels 1 and 2 each have an independent timer and these timers are operated individually. Channel 3 does not have a timer.

Part I

Each timer is programmed by editing a table containing 5 steps. Each step consists of voltage, current, and duration (seconds) parameters. The duration of each step is programmable from 0 to 10,000 seconds. A graphical representation of the voltage and current profile is shown on the timer screen. 
To edit a timer:
  • Press Timer on the front panel of the power supply
  • Press 1 or 2 to select table for the channel you are programming
  • Press left or right arrow buttons to tab through the table
  • Press the Fine button to select digits within the value you are editing and use the rotary knob to increase the value.

You can start and stop the timer from the timer screen with a momentary click-in of the rotary knob.


To start and stop the timer from the Volts/Amps/Watts display, select channel 1 or channel 2. Then use the arrow keys to tab to the TIMER field at the bottom of the channel display. Rotate the rotary knob to change the ON/OFF state then click-in the rotary knob.

To initiate a timer sequence:

  • Select CH1 or CH2
  • Change the state of TIMER to ON
  • and click in the rotary knob on the front panel of the power supply to start the sequence

The sequence turns the output ON and begins at step 1. The timer cannot be programmed to turn the output on or off within the sequence. Any steps with a duration of 0 are skipped. At the end of the sequence the output turns OFF. The sequence does not loop or repeat.


When using the EasyPower application software, a sequence of 100 steps is possible and the sequence may be set to repeat or loop continuously.

Part II

Making and Using a Timer sequence with EasyPower


To create a Timer sequence with EasyPower, download our EasyPower app from here:


https://siglentna.com/service-and-support/firmware-software/dc-power-supplies/#spd3303xx-e-series

EasyPower uses a VISA application, such as NI-VISA, to communicate with the instrument over LAN or USB.


EasyPower provides a control screen that looks like this:

To modify the sequence, edit the steps in the table. Save the steps to a file before proceeding.


On the front panel of the power supply, manually select the channel and turn the output ON.


Press Start to on the Set Timer dialog box to update the graph of the program sequence and run it.


On the front panel of the power supply, manually select the channel and turn the output OFF.


Here is an example:

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