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DLP limited to 116.7 Hz, not 120 Hz for stored pattern sequence?

Hi,

Apologies for opening yet another topic, however this question is unrelated to the other one.

Uploading and displaying a sequence of 3 different 8-bit patterns works fine, but not at the proclaimed maximum refresh rate of 120 Hz. The max it seems to be able to achieve is 116.7 Hz, corresponding to a trigger period of 8568 µs. This is measured with a simple photodiode and oscilloscope and is consistent with the fact that whenever I try to set the trigger period to 8333 µs (corresponding to 120 Hz), and I run the sequence and "get" the lightcrafter stats again, the trigger period has suddenly gone back to 8568 µs. No matter what I try, it will not run at lower than 8568 µs...

I am on the newest Firmware upgrades for all subparts of the lightcrafter.

Any ideas?

Sam