1 – 12
Getting Started
1.2.4.6 Indicators on the timing diagram
The timing diagram on the front panel of the SR470 serves not only as
an illustration of the di
ff
erent time intervals but also as an indicator.
As mentioned earlier, the
N.O.
or
N.C.
label on the diagram will be
lit to indicate the configured polarity of the shutter. Additionally,
the labels T
pre
, T
exp
, and T
post
on the diagram will each illuminate
in sequence to indicate which phase of a sequence is currently being
executed.
(Note: it is possible to disable the front panel LEDs; see
§
1.2.5.6.)
1.2.5
Utility functions
Several useful features of the SR470 are located in or near the “Util-
ity” section of the front panel.
1.2.5.1 Alarm key
The [Alarm] key toggles the configuration of the SR470 audible alarm
between the states of
Ready
and
Mute
.
As discussed in
§
1.2.2.4 and
§
1.2.2.5, the audible alarm is active
whenever the front-panel
FAULT
indicator is lit, unless the alarm is
muted. The fault condition causing the alarm can usually be cleared
by pressing the [
] (reset) key.
1.2.5.2 Align key
The [Align] key enables a special
alignment
mode, where the shutter
is commanded to chop (open and close) at a rate of approximately
1 Hz. This mode is intended to help facilitate mechanical alignment
and identification of shutter heads. This function is only available
when connected shutter head is enabled and in one of the triggered
modes, either
INT TRIG
or
EXT TRIG
(
§
1.2.3).
The enunciator “Align” to the left of the numeric display will light
up and remain lit so long as
alignment
mode is selected.
Alignment
mode is “transient,” and only lasts until another feature
of the SR470 is accessed that a
ff
ects the shutter state.
1.2.5.3 Shift key
Operation of the [Shift] key, which is used to select the functions
printed in gray above the keys, is described in
§
1.2.1.
SR470 Shutter Controller
