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Appendix A Specifications 131
Shutters
The round head camera does not have an internal shutter. The rectangular head camera is
supplied with either a 25 mm internal shutter (C-mount) or a 35 mm internal shutter
(F-mount).
* The Shutter Compensation times listed below are based on the values used
by
the WinView/32 program.
Shutter Shutter Comp. Time
None 200 nsec
Electronic 6.0 msec
Remote (Princeton Instruments supplied 23 mm, typically a slit
shutter)
8.0 msec
Small (Princeton Instruments supplied 25 mm) 8.0 msec
Large (Princeton Instruments supplied 35 mm) 28.0 msec
Table 18. Shutter Compensation Times
Inputs
EXT SYNC: TTL input (BNC) to allow data acquisition to be synchronized with
external events. Sense can be positive or negative going as set in software.
Synchronization and Trigger Modes are discussed in Chapter 6.
Outputs
VIDEO: 1 V pk-pk from 75 Ω, BNC connector. Either RS-170 (EIA) or CCIR standard
video as specified when system was ordered. Requires connection via 75 Ω cable that
must be terminated into 75 Ω.
: TTL output (BNC) for monitoring detector status. Logic output is software-
selectable as either NOT SCAN or SHUTTER. When the logic output is NOT SCAN, it is
at a TTL low when CCD is being read; otherwise high. When the logic output is
SHUTTER, the output precisely brackets shutter-open time (exclusive of shutter
compensation) and can be used to control an external shutter or to inhibit a pulser or
timing generator. Default selection is SHUTTER.
: TTL output (BNC); marks start of first exposure. When run is initiated,
remains high until completion of cleaning cycles preceding first exposure, then goes low
and remains low for duration of run.
SERIAL COM: Data link to com
puter via proprietary cable connected to this 9-pin "D"
connector. Cable lengths to 165 feet (50 m) available.
USB 2.0: Data link to computer via USB cable inserted at this connector. Cable length
of 5 m
eters is standard. Other lengths may be available. Contact Customer Service for
more information.
* The 35 mm shutter requires a controller having the 70 V shutter drive modification.
Controllers having this option cannot be used with cameras with the 25 mm shutter.