1 – 20
Getting Started
The SR470 serial number and ethernet MAC address are printed on
a label located on the back side.
1.3.1
Power entry
The power entry module is located on the upper left side of the rear
panel and contains an integrated power switch.
The universal input power supply of the SR470 accommodates any
voltage in the range 90 VAC to 260 VAC, with a frequency in the range
47 Hz to 63 Hz.
The SR470 has a detachable, three-wire power cord for connection
to the power source and to a protective ground. The exposed metal
parts of the instrument are connected to the outlet ground to protect
against electrical shock. Always use an outlet which has a properly
connected protective ground.
1.3.2
Chassis ground
This binding post is connected to the SR470 chassis and to earth
ground.
1.3.3
TTL input
The primary input for the SR470 Shutter Controller is the rear-panel
BNC input labeled “Control Input.” This connector accepts an ex-
ternally generated logic-level input signals. It is internally pulled up
to
+
3.3 VDC through 100 k
Ω
and is compatible with
+
5 VDC (TTL)
input signals.
The input is
active low
, and the response to the input signal is mode
dependent. When the SR470 Shutter Controller is in the
INT TRIG
mode (
§
1.2.3), the control input is ignored. In
EXT TRIG
mode, a
trigger is generated when a low-going edge is detected on the input.
In the
EXT LVL
mode, a signal that is unasserted, i.e., logically high
or open (disconnected), commands the shutter to its
Normal
state,
and an input signal that is asserted, i.e., pulled low, commands the
shutter to its
normal
state.
Note: The shield of the input BNC is connected to earth ground.
1.3.4
Shutter connector
The SR470 has one shutter connector, which provides power and
interface connections for an external SR470 Series Laser Shutter head.
Never connect the shutter output port to anything other than an
CAUTION
SR470 Series Laser Shutter head.
SR470 Shutter Controller
