The control box and display built by Rolf receive a time synchronisation pulse via GPS. The display contains three rows with LEDs: The first row lights up one LED every 0.1 second, the second one every 0.01 s, the third one every 0.001 s. If the camera has an analog video signal, the control box inserts a time visualisation in the video signal. For normal CCD cameras, the time stamping accuracy of the readout software can be checked by comparing the running lights with the time stamp by the readout software. The latter reads the PC clock, which in turn is synchronized via the internet using the freeware TimeMemo.
For the analog cameras, the PAL signal was converted to USB by a converter from Conrad Electronics.
Here are the results for the different cameras (click the camera name for more details):
Detlef, 26 Aug 2008 - undated 29 Aug 2008.