1 – 4
Getting Started
Pressing the [Step Size] key displays the step size for the current
parameter, which may be changed by typing and entering a new
value. Pressing [Step Size] again returns the display to the previously
displayed parameter. Pressing the [
] (up arrow) or [
←
] (left arrow)
while the step size is displayed increases the step size to the next
larger decade, while pressing the [
] (down arrow) or [
→
] (right
arrow) key will decrease the step size to the next smaller decade.
1.2.2
Master control and basic shutter operation
The “Master” section of the front panel, located on the left hand side,
contains some of the most important and frequently used controls
on the SR470 . There are four keys in this section: [
] (trigger), [
]
(reset), [OPEN] and [CLOSE]. Each of these keys has an associated
indicator LED, and there is also a
FAULT
indicator located between
the
OPEN
and
CLOSED
indicators. In introducing these features we
will discuss many aspects of manual shutter control.
1.2.2.1 Keys and normal operation
When the SR470 has an attached shutter head that is powered on
and functioning properly, the four keys in the “Master” section have
the following functions:
•
The [
] (trigger) key instructs the SR470 to initiate a predefined
timed sequence of operation, which may be a single open-
ing
/
closing cycle, a finite burst, or continuous operation. Note:
This key is ignored if the instrument is in the
EXT LVL
mode
(
§
1.2.3.3).
•
The [
] (reset) key cancels any timing sequence (trigger) in
progress and resets the shutter to the unasserted, or
normal
,
state (
§
1.2.2.2).
•
The [OPEN] key commands an attached and operational shut-
ter head to go to the open state.
•
The [CLOSE] key commands an attached and operational shut-
ter head to go to the closed state.
These buttons can a
ff
ect the operational mode (
§
1.2.3) of the SR470 .
Pressing either [
] (reset), [OPEN], or [CLOSE] are requests for man-
ual control that will force the instrument to the
INT TRIG
mode.
Pressing the [
] (trigger) key while the instrument is in the
EXT TRIG
mode will not change the mode, but will force a trigger even though
it remains in the externally triggered mode.
SR470 Shutter Controller
