Vision Research, Inc. | Phantom Ultrahigh-Speed Camera Manual
Filter (Filter Time): When a ‘Filter’ token is present, the ‘input’ of the pulse processor
is filtered through an edge filter of the specified time. The time of the filter can be
between 0 and 1 second. In order for the output of the filter to be asserted, the ‘input’
signal must be continuously de-asserted for the same duration. The edges of the
‘input’ are thus delayed by the specified filter time (for a ‘clean’ input pulse). Filtering
is applied before and independently of the delay and duration. The filter time is
specified in microseconds (as a floating point number) and is internally converted and
routed to pixel clock units.
PIXEL CLOCK
The period of the pixel clock is the basic time interval for all camera timing.
Please note that pulse processors can sometimes generate pulses that are too short
for the output drivers to switch properly and, as such, the processed signal should be
verified with an oscilloscope before use.
PROGRAMMABLE SIGNALS & DESCRIPTIONS
Ready: An isolated open collector output with 1k pull-up signal (active high). ‘Ready’
is asserted when the camera goes into ‘Capture’ mode and is de-asserted either
when the Cine is triggered or when the Cine recording is completed. ‘Ready’ changes
synchronously with frame capture (at the end of each exposure), so in ‘External Sync’
mode it will not change until F-Sync pulses are received.
Strobe: An isolated open collector output signal with 1k pull-up. When asserted (low)
‘Strobe’ indicates that the camera integrates. (The electronic shutter is open.) Strobe
is low for the duration of the exposure.
F-Sync: The only signal can be set as an output or input. By default, it is output
(sync-internal). Output signal is a frame sync pulse from the camera’s frame rate
generator. A short (few hundred ns depending on camera model) negative pulse
with the falling edge is used as timing reference. Input signal is active on falling edge.
(Default state is high.)
TC-Out: A positive polarity time code signal. Normally an unmodulated (dc-shifted)
IRIG-B (at RS-232 levels) which follows the internal time base of the camera. It is
recommended not to process the ‘TC-Out,’ since a processed signal may no longer
represent a standard or accurate time code.
All descriptions are the signal’s default state prior to processing.
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