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56 I-PentaMAX System Manual Version 3.A
cleaning, generating pulses with a frequency equal to the vertical shift time of the device
being used. This characteristic makes NOTSCAN unsuitable for inhibiting a pulser while
the array is being read out. Use the SHUTTER signal instead (NOTSCAN and
SHUTTER can also be provided at the I-PentaMAX LOGIC OUT connector).
Shutter opens
(shutter preopen) (shutter normal)
Continuous
Cleans ?
Ye s
No
Ye s
No
Continuous
Cleans ?
CCD is continuously
cleaned until
External Sync
pulse is received
CCD is continuously
cleaned until
External Sync
pulse is received
Controller waits for
External Sync pulse
Controller waits for
External Sync pulse
Shutter remains open
for preprogrammed
exposure time
System waits while
shutter closes
Shutter opens
Figure 17. Chart showing two External Sync Timing Options
First wait
and exposure
Data
stored
Second wait
and exposure
Third wait
and exposure
Data
stored
Data
stored
NOTSCAN
(Continuous
Cleans OFF)
Shutter (Normal)
Open Close Open Close Open Close
Read Read Read
Shutter (Preopen)
Open Close Open
Close
Open Close
External Sync
(negative polarity shown)
t
exp
t
c
t
R
t
w1
Figure 18. External Sync (Continuous Cleans OFF) Timing diagram