Princeton Instruments NIRvana-LN, User Manual, Page: 73 / 122

Chapter 8 Experiment Synchronization 73
8.2.1 Free Run {No Response}
In this mode, there is no external triggering or the camera ignores external triggers, and all
settings are obtained from the setup parameters, making the duration of each exposure time
constant and the interval times between exposures constant.
NOTE:
In this timing mode, all shutter modes behave the same way.
See Figure 8-2 for the timing diagram for this mode where:
• t
R
= 4.051 mS.
Figure 8-2: Timing Diagram: Free Run {No Response}
8.2.2 External Sync {Readout Per Trigger}
In this mode, each frame within a sequence requires a trigger. Each frame is exposed for the
length of time specified within the software and is then read out. If a trigger arrives during
the exposure-readout cycle for the previous frame, it is ignored.
NOTE:
For a one-frame sequence, Bulb Trigger { Expose During
Trigger Pulse } and Trigger Start { Start on Single Trigger } are
equivalent to
External Sync
{
Readout Per Trigger
} mode.
Figure 8-3 illustrates a timing diagram for this mode where:
•
Triggering is on
Trigger In
rising edge;
• t
TRIG
≥ 20 nS;
• t
R
= 4.051 mS;
Shaded areas indicate the idle time between exposures.
E
XPOSURE
R
EAD
O
UT
#1 #2 #3 #4
#1 #2 #3 #4
441
1-01
45_00
33
R
ESET
t
R