Piranha HS-xx RoHS User Manual
Teledyne DALSA
03-032-20013-03
41
Table 10: Piranha HS Exposure Modes
Programmable Frame Rate Programmable Exposure Time
Mode SYNC
Description
3
External
N o
N o
Maxim u m exp osu re tim e w ith no charge
reset.
7
Internal
Yes
N o
Internal sync, m axim u m exp osu re tim e
w ith no charge reset.
Exposure Modes in Detail
When setting the fram e rate (u sing the ssf com m and ), exp osu re tim e w ill be red u ced , if
necessary, to accom m od ate the new fram e rate. The exp osu re tim e w ill alw ays be set to
the m axim u m tim e (fram e p eriod – fram e transfer tim e – p ixel reset tim e) for that fram e
rate w hen a new fram e rate requ iring red u ced exp osu re tim e is entered .
When setting the exp osu re tim e (u sing the set com m and ), fram e tim e w ill be increased , if
necessary, to accom m od ate the exp osu re tim e. Und er this cond ition, the fram e p eriof w ill
equ al the Read ou t+Exp osu re Pu lse+Exp osu re Tim e.
Fram e rate is set by the p eriod of the external trigger p u lses. EXSYN C p u lses faster th an
the read ou t tim e are ignored . The falling ed ge of EXSYN C m arks the start of read ou t.
N ote: In TDI m od e the fram e p eriod equ als the line p eriod .
Mode 3: External Trigger, Maximum Exposure Time
Figure 23: Mode 3 Timing
Frame Period
Exposure Time
Frame Period
Readout
Exposure Time
EXSYNC
Falling Edge
Ignored During
Readout
Readout
Mode 3
Falling Edge
Ignored During
Readout
In this m od e, the external trigger rate sets both the fram e rate and the exp osu re tim e. The
rising p u lse of the external trigger m arks the beginning of the exp osu re tim e. Read ou t
begins on the falling ed ge of EXSYN C. A charge d u m p occu rs at the beginning of the
exp osu re tim e, clearing any accu m u lated charge gathered u p to this p oint. An external
shu tter or strobe shou ld be u sed to rem ove light d u ring read ou t.
Mode 7: Internal Frame Rate, Maximum Exposure Time
In this m od e, the fram e rate is set internally u sing the
ssf
com m and w ith a m axim u m
exp osu re tim e.
N ote: In TDI m od e the fram e p eriod equ als the line p eriod .
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