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Chapter 6 Operation 35
Note that a camera having the 35 mm shutter
can only be used with an ST-133 equipped with
the 70 V shutter option. An ST-133 that has the
70 V shutter drive option can be identified by
the
70 V OPT
label on its rear panel as shown
in Figure 14.
Note that there is a Shutter Setting push switch
that sets the shutter drive voltage. Each shutter
type, whether internal or external, requires a
different setting. Consult the table below to
determine the proper setting for your shutter.
The Shutter Setting dial is correctly set at the
factory for the camera’s internal shutter if one
is present.
SHUTTER CONTROL
REMOTE
SETTING
70V
OPT.
4
Figure 14. Back Panel of ST-133 with
70 V Shutter Drive Option
1 External Shutter
2 Small Internal Shutter
4 35 mm Vincent Shutter
(supplied with NTE camera having 1300 × 1340 CCD)
5 Large Internal Shutter
Table 2. ST-133 Shutter Drive Selection
An incorrect setting may cause the shutter to malfunction or be damaged. An ST-133
with the 70 V Shutter option cannot be used with a camera having the small (standard)
shutter, even by selecting a lower number, because the shutter could be permanently
damaged by the high drive voltage and larger stored energy required to drive the 70 V
shutter.
Shutter Life
Note that shutters are mechanical devices with a finite lifetime, typically on the order of
a million cycles, although some individual shutters may last a good deal longer. How
long a shutter lasts in terms of experimental time will, of course, be strongly dependent
on the operating parameters. High repetition rates and short exposure times will rapidly
increase the number of shutter cycles and decrease the time when the shutter will have to
be replaced. Possible shutter problems include complete failure, in which the shutter no
longer operates at all, or the shutter may stick open or closed causing overexposed or
smeared images. It may even happen that one leaf of the shutter will break and no longer
actuate.
Shutter replacement is usually done at the factory. If you find that the shutter on your
detector is malfunctioning, contact the factory to arrange for a shutter-replacement
repair. Note that shutters are not covered by the warranty.
Disconnecting or connecting the shutter cable to the detector while the controller is on
can destroy the shutter or the shutter drive circuitry.
Always power off the controller
before adjusting the shutter cable.
WARNING
WARNING