User Manual

CR LED Function

CR LED is a function that allows the instrument to simulate the loading behavior of typical LEDs,

which can be used for testing LED drivers. When the function is enabled, the load allows the

user to configure the LED’s operating resistance and forward voltage along with the voltage

range (same as CR operation). Below illustrates the V-I characteristics curve of a typical LED.

Figure 17 - CR LED IV Characteristics Curve

Vd = Forward voltage of the LED

Rd = LED’s operating resistance

Vo = Operating voltage across the LED

Io = Operating current across the LED

To configure CR LED function, follow the steps below:

1. Press ( ) and ( ) to access the CONFIG menu.

2. Select CR_LED and press .

3. Select On and press . Press to exit the CONFIG menu.

4. Press to enter CR operation, then press ( ) and to access CR

mode settings.