Measure from Milliseconds to Minutes – easily measure the fastest single frame exposures all the way to minute-long exposures or video clips. Step time is programmable from 0.1 ms per step to 1.0 second per step and the total display cycle time is from 10.0 ms to 100 seconds.
Emphasis LEDs for Easier Counting – To make the LED counting process faster and more accurate, Isolight features an LED emphasis mode. The emphasis mode makes every fifth, tenth, or 33rd LED brighter. Those emphasis LEDs make blocks of LEDs easier to count the same way tick marks on a ruler make measurements easier.
Auto LED Brightness – Like other Isolight components, the LED chaser brightness can be set manually or to automatically adapt to ambient light levels. In “auto” mode the LED brightness is set so that the LEDs are clearly visible at any light level but not so bright as to introduce light pollution.
Audio Output for Audio/Video Testing – the Isolight can also generate audio markers (beeps) synchronized with the LED chaser operation for testing camera audio/video synchronization.
Use the LED chaser to measure:
- Integration/Exposure Time – the most basic measurement. Set the LED chaser at an appropriate step rate and capture an image. By counting the number of lit LEDs, you can measure the image’s exposure time.
- Frame Rate – Set the LED chaser so that several LEDs are visible in each image. The frame rate is the number of LEDs from the start of the bar in one image to the start of the bar in a second image
- Frame Rate Jitter – the frame time from one image to the next should be constant. If the frame rate varies more than one LED, there is significant frame rate jitter in your system
- Dropped Frames – Every LED should be visible in at least one video frame. If any LEDs are missing from the sequence, your system is dropping frames. You can estimate the drop-out period as well
- Audio/Video Synchronization – Audio/video track synchronization can be measured by capturing video with audio markers enabled for emphasis LEDs. Each audio marker should sound during the associated video frame. The amount of leading or lagging indicates the audio track desynchronization
- Auto-Exposure Behavior – Using the auto LED brightness mode, you can watch the exposure time change from frame to frame as you adjust the light level. This is very useful for measuring and auto exposure convergence time, stability, and over/undershoot