Ø1" Beam Shutter Chapter 3: Introduction
Rev E, March 16, 2020 Page 5
3.2.1. Timing Performance
Event Time (Typical)
TI 10 ms
TO 10 ms
TD/R 20 ms
TC 10 ms
MSOP 40 ms
MOP (SC10) 40 ms
TI, Transfer Initialize: Time from the application of an energizing voltage
to the initial movement of the shutter.
TO, Transfer Open: Time for the shutter to open from 20% exposed to
the 80% exposed.
TD/R, Transfer Dwell/Release: Time from the removal of the holding
voltage or pulse to the point where the shutter begins to close.
TC, Transfer Close: Time for shutter to close from an 80% exposure to
20% exposure.
MSOP, Minimum Shutter Open Time: Minimum shutter open time using
the MOP from the SC10 controller.
MOP, Minimum Open Pulse: Minimum pulse width of SC10 controller.
Note: The shutter SH1 is not meant for operation in critical timing
applications. Performance may vary from unit to unit.
3.2.2. Typical Performance
The SH1 is capable of operating at a sustained maximum rate of 12.5 Hz with a
minimum on time of 40 ms. As programmed exposure times (open times) increase
to beyond 60 ms the dominant characteristics of magnetic distortion, TI and TD/R
as shown in Figure 1, become constants. The net effect of this anomaly is that the
delay from the control pulse (or trigger) to the shutter opening is 10 ms, and the
duty cycle distortion incurred is ±10 ms. As an example: If the SC10 is programmed
for 200 ms open and 200 ms close time, the result would be a 210 ms exposure
and a 190 ms closure on the SH1.
