Datasheet

Section 9: Pulse Testing High-Brightness LEDs Model 2461 Interactive SourceMeter® Instrument User's Manual
9-6 2461-900-01 Rev. A / November 2015
The following figure illustrates these test parameters.
Figure 52: Model 2461 Pulse Sweep Diagram
Set up the source and measure functions
To generate high-speed, high-current pulses and measure the voltage during each pulse, it is
important to configure the measure and source functions appropriately.
The pulse command will report an error if the set measure time is longer than the pulse width.
To minimize measure time:
 Set the voltage measure range to a fixed range.
 Set the integration rate of the measurement to 0.01 NPLC (166.67 µs at 60 Hz line frequency).
 Run autozero once to perform a one-time autozero operation before the start of the trigger model.
For more precise source times:
 Turn off the source readback feature. If you want to use source readback, you must allow enough
time for two measurements: The voltage measurement and the current source measurement.
 Set the source delay time to zero.
The pulse command's trigger model
The built-in pulse settings screen and the remote pulse commands configure the trigger model of the
Model 2461 to generate the pulses. Executing the pulse command or generating a pulse setup from
the front panel will take a snapshot of the active source and measure settings of the Model 2461.
These settings are saved to configuration lists. The trigger model recalls the settings in the
configuration lists, triggers the pulse and measure using constant delays, and loops to create the
specified number of pulses. The trigger model must be generated again if source or measure settings
(such as NPLC and autozero) are changed and you want these settings to be applied to the pulse
trigger model.