User manual

Rolera Thunder User Manual 15

Strobe Mode

In Strobe mode, each frame in a sequence requires a trigger. Each frame is exposed for the

length of time entered into the software and is then read out. If a trigger arrives during the

exposure-readout of the previous frame, it is ignored (see Figure 15). For a sequence of one

frame, strobe mode and trigger-first mode are the same. The shaded areas denote the idle

time between exposures. Strobe mode only operates in Non-Overlap mode.

Figure 15. Strobe Mode Timing Diagram

Bulb Mode

In Bulb mode, exposure time for each frame is determined by the trigger pulse width. Exposure

time entered into the software is ignored in this mode (see Figure 16). If a trigger arrives during

the readout of the previous frame, it is ignored. The shaded areas denote the idle time

between exposures. Bulb mode only operates in Non-Overlap mode.

Figure 16. Bulb Mode Timing Diagram

Notes:

1. When the clocking mode is "Alternate Frame Transfer", the camera can be operated in "Overlap" or

"Non-Overlap" mode as explained previously.

2. Trigger-first mode allows overlap or non-overlap modes. In strobe and bulb triggering modes, the

camera can be operated in non-overlap mode only.

Dual-Camera Triggering

The Rolera Thunder can be implemented in a dual-came

ra system, where both cameras are

triggered via a hardware signal simultaneously. However, in some cases, a horizontal banding

pattern is visible in the images within this setup. There is no current workaround to this

problem.

Readout

Trigger

Exposure

#1 #2 #4#3

Ignored

Trigger

Exposure

Readout

Ignored