Here is a demonstration of a simple use case with our SLT3G1 test cube for measuring the IF(V) characteristics of a Power Flash LED.

Setup

• 2 hook wires to power the Flash LED
• 2 hook wires to sense the Flash LED terminal voltages

The Digital Power Supply output of SLT3G1 is equipped with a current sense that can be triggered on demand.

Program SLT3G1 (remote)

• Create 1 script (VPULSE) to apply a voltage pulse with a parametric amplitude
• Create 1 script (vSWEEP) to sweep the amplitude
• Collect the measurement data

Script syntax (PULSE generation)

beginTask 0.0 0 0 VPULSE;
   ldoSetVout 0.0 xrVAR1 1;                      // sets DPS 1 power supply CH 1, reads from VAR1
   delayms 50.0;                                        // 50ms
   SingleExternalMeasurement 0.0 1 1;     // Votlage sense VF(+) = ANA1.1   (MUX1_CH1)
   SingleExternalMeasurement 0.0 2 1;     // Votlage sense VF(-)  = ANA2.1   (MUX2_CH1)
   subFloat 0.0 xrMUX1_CH1 xrMUX2_CH1;      //  math operation VF = VF(+) - VF(-)
   getFloatVar;                                    // reports VF data
   ldoGetIout 0.0 0 1;                          // measures and report DPS 1 current IOUT1
   ldoSetVout 0.0 0 1;                         // Turns off the Voltage pulse
   delayms 500.0;                               // 500ms
endTask;;

Attention: The syntax is case sensitive.

In this example we create a parametric pulse with a variable amplitude and defined ON and OFF duration.

The measurements are embedded during ON duration.

Script syntax (Voltage pulse sweep)

beginTask 0 0 0 vSweep;

   setUsrFloatVar 0.0 0 xrVAR1;       //   global  VAR1 = 0

   executeTask 0.0 0 0 VPULSE;       //  Runs VPULSE, which uses global VAR1

   setUsrFloatVar 3.1 0 xrVAR1;       //   VAR1 = 3.1V

   executeTask 0.0 0 0 VPULSE;       //  reruns VPULSE

   setUsrFloatVar 4.0 0 xrVAR1;       //  VAR1 = 4.0V

   executeTask 0.0 0 0 VPULSE;       //  reruns VPULSE

endTask;

The task vSweep is mapped to front panel short cut with the following instruction

beginVolatileTask;

    setTaskShortcut 0.0 0 1 vSweep;    // maps button F1 to task vSweep

endTask;

The task vSweep can also be executed by soft as follows

beginVolatileTask;

    executeTask 0.0 0 0 vSweep;

endTask;

Run the script from the internet browser (LAN connection) and collect the data !

Finally a short video to view the simplicity of it: LED PULSED CURRENT SWEEP VIDEO