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Contents

SR475 and SR476 Laser Shutters

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Содержание SRS SR475

Страница 1: ...Research Systems Revision 1 2 September 1 2011 Distribution in the UK Ireland Lambda Photometrics Limited Lambda House Batford Mill Harpenden Herts AL5 5BZ United Kingdom E info lambdaphoto co uk W ww...

Страница 2: ...be returned to a Stanford Research Systems authorized service facility Contact Stanford Research Systems or an authorized representative before returning this product for repair Information in this do...

Страница 3: ...on 1 1 1 1 Introduction to the Instrument 1 2 1 2 Mounting 1 6 1 3 Optical alignment 1 8 1 4 Optical power capacity 1 9 1 5 Operating environment 1 9 1 6 Alternate speed modes 1 10 1 7 Shutter interfa...

Страница 4: ...ii Contents SR475 and SR476 Laser Shutters...

Страница 5: ...no user serviceable parts inside and reassembling the unit to its calibrated state may be di cult or impossible Environment This product is intended for use only in a clean and dry laboratory environ...

Страница 6: ...nd on SRS Products Symbol Description Alternating current Caution risk of electric shock Frame or chassis terminal Caution refer to accompanying documents Earth ground terminal Battery Fuse On supply...

Страница 7: ...TION is possible Typesetting conventions used in this manual are Remote command names are set as A Literal text other than command names is set as OFF Remote command examples will all be set in monosp...

Страница 8: ...nde nite in either open or closed state Mounting Orientation Any Mounting holes 8 32 3 1 4 20 1 Housing material Anodized aluminum Performance Open close time 5 ms full stop to full stop in full speed...

Страница 9: ...on condensing Maximum temperature 90 C Shutter interface Voltage inputs 12 VDC 4 5 VDC Current draw 1 20 A max continuous 12 VDC 0 25 A max continuous 4 5 VDC Signal lines Serial TX Serial RX logic le...

Страница 10: ...viii General Information SR475 and SR476 Laser Shutters...

Страница 11: ...tes 1 4 1 1 5 Power on state 1 6 1 1 6 Resetting the shutter head 1 6 1 2 Mounting 1 6 1 2 1 Vibration considerations 1 6 1 2 2 Thermal considerations 1 7 1 2 3 Grounding considerations 1 8 1 3 Optica...

Страница 12: ...r s open and closed positions are then determined by physical stops that limit the blade travel By contrast the SR475 and SR476 Laser Shutters do not use physical stops to control the blade position I...

Страница 13: ...ders of magnitude more than is typically found in other laser shutter systems The on board electronics in the shutter head detect the blade position servo control the blade position and provide contro...

Страница 14: ...the shutter s maximum rate of 100 Hz The minimum exposure time be tween the midpoint of opening and the midpoint of closing is 5 ms For the SR476 each full speed pre programmed trajectory takes 4 ms...

Страница 15: ...m Curve a illustrates the position of the SR475 blade as it moves from the closed to the open position and curve b illustrates the closing trajectory Curve c illustrates the position of the SR476 blad...

Страница 16: ...ll settings and modes of the SR475 and SR476 are in volatile mem ory and at power on the instrument always returns to its default state 1 1 6 Resetting the shutter head The SR475 and SR476 can be rese...

Страница 17: ...a heavy damped optical table will minimize its vibrational e ects 1 2 2 Thermal considerations Like most other mechanical shutters the performance of the SR475 and SR476 Laser Shutters are fundamenta...

Страница 18: ...ation man ual for details Apart from the cable shield the shutter cable uses a separate signal ground as one of the power supply lines This ground is normally isolated from the shutter case and cable...

Страница 19: ...lications The maximum power handling capability of a laser shutter depends on wavelength duty cycle and many other environmental factors SRS does not establish optical power ratings for laser shutters...

Страница 20: ...shutter head is 90 C Above this temperature permanent damage can result 1 5 4 Vacuum The SR475 and SR476 Laser Shutters are not designed for use in a vacuum environment The shutter mechanism relies on...

Страница 21: ...12 5 Hz Table 1 1 Model SR475 Laser Shutter speed modes Mode Transition time Max Rate 0 4 ms 125 Hz 1 8 ms 62 5 Hz 2 16 ms 31 25 Hz 3 32 ms 15 625 Hz Table 1 2 Model SR476 Laser Shutter speed modes Th...

Страница 22: ...ble 1 3 Shutter connector pinouts The pinout for the connector is shown in Fig 1 4 and the signal names are shown in Table 1 3 The shield of the shutter connector is connected to the case of the shutt...

Страница 23: ...n external signal level converter to translate between the logic level signals at the shutter head and for example the voltages and inverse polarity of an RS 232 interface 1 7 1 2 Control signal The l...

Страница 24: ...1 14 Operation SR475 and SR476 Laser Shutters...

Страница 25: ...f Commands 2 2 2 2 Introduction 2 3 2 2 1 Control modes 2 3 2 2 2 Timing considerations 2 3 2 3 Commands 2 4 2 3 1 Command syntax 2 4 2 4 Command List 2 5 2 4 1 Shutter motion control commands 2 5 2 4...

Страница 26: ...trol mode commands E 2 6 Serial control lockout F 2 6 Logic level control lockout G 2 7 Flexible default control mode Communication control commands L 2 7 Enable assertive mode M 2 7 Disable assertive...

Страница 27: ...ial interface Executing any remote command that changes the position of the shutter blade will force the shutter into logic level lockout mode where it will no longer respond to the logic level contro...

Страница 28: ...g character is for negative numbers or ASCII 32 for positive numbers Aside from communication errors commands may fail due to either syntax or execution errors Not all such failures will generate a fa...

Страница 29: ...ggle state B Moves the shutter from the Open state to Closed state or vice versa depending on the initial state When executed this places the shutter into logic level lockout mode See description of c...

Страница 30: ...t alternate speed mode 3 for the shutter head so that it moves at one eighth of full speed between open and closed 2 4 2 Shutter control mode commands Serial control lockout E Disable remote serial co...

Страница 31: ...ode is enabled the shutter head will actively re quest communication by issuing a Serial Break character if a fa tal fault occurs The fatal faults are those that will trip the shutter into the standby...

Страница 32: ...d until a hard reset either with command C or by removing power 1 1 5 Assert fault O This command simulates a fatal fault which will trip the shutter to the standby mode This function is provided as a...

Страница 33: ...temperature as measured at the printed circuit board in the shutter head in C T Example 42 The shutter is at an approximate temperature of 42 C Error Word W Query the shutter head error word The erro...

Страница 34: ...erial number is 1234 Status Word Z Query the shutter head status word a 15 bit value that is returned as an unsigned integer It can be used to verify the current modes and settings of the shutter head...

Страница 35: ...l control of the blade position is disabled Bit 6 Alignment mode is 1 when the shutter head is in alignment mode This bit is only meaningful when the motor is enabled Bit 11 Locked is 1 when the shutt...

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