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THORLABS MC2000, Руководство по эксплуатации

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 Optical 

Chopper 

System 

 

18488-D02 Rev G, September 24, 2012 

Page 2 

www.thorlabs.com 

Table of Contents

 

ePart 1.

 

Safety Warnings ...........................................................................................................................5

 

Part 2.

 

Product Overview .........................................................................................................................6

 

Front Panel Description ............................................................................................................................................. 7

 

Rear Panel Description .............................................................................................................................................. 7

 

Part 3.

 

Setup .............................................................................................................................................8

 

Part 4.

 

Basic Operation ............................................................................................................................9

 

4.1.

 

Internal Reference Operating Mode ...................................................................................................... 9

 

4.2.

 

External Reference Mode ........................................................................................................................ 9

 

4.3.

 

Reference-Out Signal ............................................................................................................................. 10

 

Part 5.

 

Advanced Operating Instructions ..............................................................................................11

 

5.1.

 

Internal Frequency Synthesizer ............................................................................................................ 11

 

Setup for Internal Reference Frequency .................................................................................................................. 11

 

Selecting the REFERENCE OUT signal ................................................................................................................. 11

 

5.2.

 

External Reference Mode ...................................................................................................................... 11

 

Setup for External Reference Frequency ................................................................................................................. 11

 

Selecting the REFERENCE OUT signal ................................................................................................................. 11

 

5.3.

 

Harmonic Reference Generation .......................................................................................................... 12

 

Setup for External Reference Frequency ................................................................................................................. 12

 

Setting the Reference Harmonic .............................................................................................................................. 12

 

Setting the Sub-Harmonic ........................................................................................................................................ 12

 

Combining the Harmonic and Sub-Harmonic Modes .............................................................................................. 12

 

Selecting the REFERENCE OUT signal ................................................................................................................. 12

 

5.4.

 

Two-Frequency Chopping ..................................................................................................................... 12

 

Selecting the REFERENCE OUT signal ................................................................................................................. 12

 

Setting the Chopping Speed in the Two Frequency Mode ....................................................................................... 13

 

5.5.

 

Two-Slot Blade ....................................................................................................................................... 13

 

Setup for Two-Slot Blade Reference Frequency ...................................................................................................... 13

 

Selecting the REFERENCE OUT signal ................................................................................................................. 14

 

Part 6.

 

Remote Communications ...........................................................................................................15

 

6.1.

 

Installing the USB Drivers ..................................................................................................................... 15

 

6.2.

 

Command Line Interface ...................................................................................................................... 15

 

6.3.

 

Commands .............................................................................................................................................. 16

 

6.4.

 

Blade Indexes .......................................................................................................................................... 18

 

Part 7.

 

Maintenance and Troubleshooting ...........................................................................................19

 

7.1.

 

Cleaning .................................................................................................................................................. 19

 

7.2.

 

Diagnostic Messages ............................................................................................................................... 19

 

Part 8.

 

Fuse Replacement and Line Voltage Selection ........................................................................20

 

8.1.

 

Materials Needed .................................................................................................................................... 20

 

8.2.

 

Fuse Replacement and Line Voltage Selection .................................................................................... 20

 

Содержание MC2000

Страница 1: ...MC2000 MC2000 EC Optical Chopper Operating Manual ...

Страница 2: ...11 5 3 Harmonic Reference Generation 12 Setup for External Reference Frequency 12 Setting the Reference Harmonic 12 Setting the Sub Harmonic 12 Combining the Harmonic and Sub Harmonic Modes 12 Selecting the REFERENCE OUT signal 12 5 4 Two Frequency Chopping 12 Selecting the REFERENCE OUT signal 12 Setting the Chopping Speed in the Two Frequency Mode 13 5 5 Two Slot Blade 13 Setup for Two Slot Blad...

Страница 3: ...thorlabs com Part 9 Visual Menu Structure 22 Part 10 Specifications 23 Part 11 Drawings 26 Part 12 Regulatory 28 12 1 Waste Treatment is Your Own Responsibility 28 12 2 Ecological Background 28 Part 13 Certificate of Conformity 29 Part 14 Thorlabs Worldwide Contacts 31 ...

Страница 4: ...ptember 24 2012 Page 4 www thorlabs com Table of Figures Figure 1 Front Panel 7 Figure 2 Rear Panel 7 Figure 3 Circuit Board Layout with 110 220 VAC Switch 21 Figure 4 Console Dimensional Drawing 26 Figure 5 Chopper Head Dimensional Drawing 27 ...

Страница 5: ...ates and the appropriate 230 VAC input cable with each MC2000 EC for use in Europe If using this unit anywhere else the user will need to supply a properly grounded power cable to power the unit If something should go wrong with the unit do not attempt to fix Call a Thorlabs representative and arrange for repair The unit should never be opened unless changing the fuse or line voltage as described ...

Страница 6: ...ecial blade is available with 7 outer slots and 5 inner slots This slot combination allows a single beam to be split and individually modulated for ratio metric experiments Another example application is a pump probe experiment where the pump beam is modulated at the outer frequency while modulating a probe beam at the inner frequency The MC2000 provides the sum and difference frequencies of the 2...

Страница 7: ...d here Power Press to toggle power Ext Input The external reference signal is connected to this input BNC TTL CMOS logic level Ref Output The reference output signal selected by the reference out menu CMOS logic level Cooling Fan Do not block when the unit is operating Modular Interface Connector for the optical head AC input receptacle Requires an IEC compatible plug with ground terminal Cord sup...

Страница 8: ...ernal Tooth Washers 2 Remove the 3 mounting screws and lock washers from the chopper blade hub using the 1 16 hex key provided 3 Unpack the 10 slot blade and install onto chopper blade hub using the 3 screws and washers removed in the previous step Tighten the screws securely with the hex wrench 4 Attach the modular cord into the circular connector labeled OPTICAL HEAD on the back of the MC2000 co...

Страница 9: ...o the desired frequency Phase Set to the desired phase Harm N Set the N harmonic to 1 Harm D Set the D harmonic to 1 3 Highlight and select Run Mode The unit will adjust its speed and lock onto the set speed within a few seconds Note that all menu parameters can be changed in standby mode while only frequency phase and N D harmonic parameters can be changed in run mode The unit always powers up in...

Страница 10: ... signal synthesized internally from a unit s crystal clock ACTUAL The reference out signal obtained from the feedback sensor reading the outer slots on a chopper wheel INNER Reference out signal obtained from the feedback sensors reading the inner slots of a two slotted chopper wheel Note This menu item is only displayed when a two slot blade is selected OUTER Reference out signal obtained from th...

Страница 11: ...y external disturbances Therefore there may be cases where using the internal synthesizer as the reference output yields better performance i e when synchronizing multiple choppers 5 2 External Reference Mode A major benefit of using a PLL circuit to control the chopper wheel speed is the chopper can be locked precisely to an external reference signal This allows the MC2000 to be used in advanced ...

Страница 12: ...and 15 Combining the Harmonic and Sub Harmonic Modes The sub harmonic divider follows the harmonic multiplier Therefore the generated reference frequency will always be D N f f REF EXT eq 1 There are no special steps to combine these two features since they are always active Selecting the REFERENCE OUT signal In the Harmonic frequency mode a fractional harmonic reference output signal D N ACTUAL o...

Страница 13: ... a rate given by 5 7 reference 7 5 REF Inner f f eq 2 For example if the internal reference or external reference frequency is 100 Hz the outer portion of the blade would be chopping at 100 Hz and the frequency of the inner portion could be found using equation 2 Hz Hz fInner 42 71 7 5 100 5 5 Two Slot Blade The 2 slot blade provides very stable low frequency chopping up to a frequency of 99 Hz To...

Страница 14: ...o the inner slot frequency and phase of the blade If two units are to be synchronized in a master slave configuration the master unit will act as the frequency generator for the slave by connecting the reference out REF OUT of the master to reference in REF IN of the slave Master Blade MC1F2 Ref In INTERNAL Ref Out OUTER Freq Set to the desired frequency Phase Set to the desired phase Slave Blade ...

Страница 15: ...lled attach the MC2000 to the PC and power it on Your PC will then detect the new hardware and will prompt you when the installation is complete 6 2 Command Line Interface Once the USB drivers have been installed and the unit connected to the PC and powered on configure the terminal emulator as follows Baud Rate 115 2K Bits Per Second Data Bits 8 Parity None Stop Bits 1 Flow Control None If the co...

Страница 16: ...es a query The string is terminated with a carriage return CR See listing below There are a few exceptions to this which are noted below The prompt symbol will appear on power up and after a command is accepted by the system indicating it is ready to receive another command line 6 3 Commands The following list shows all of the available commands and queries and summarizes their functions ...

Страница 17: ... 360 Get Phase phase Returns the Phase adjust Set Enable enable n Set Enable 0 disabled 1 enabled Get Enable enable Get Enable Set Reference ref n Set the reference mode 0 internal 1 external Get Reference ref Returns the reference mode Set Ref Output output n Set the output reference mode 0 target 1 actual Get Ref Output output Returns the output reference mode Set Display Intensity intensity n S...

Страница 18: ...et through the command line interface using the commands blade and blade n respectively These commands do not denote blade type using product names Rather they index blade type using the numbers from 0 to 7 The following table provides the mapping Blade Index MC1F2 0 MC1F6 1 MC1F10 2 MC1F15 3 MC1F30 4 MC1F60 5 MC1F100 6 MC1F57 7 ...

Страница 19: ...inhibitor e g WD40 or similar 7 2 Diagnostic Messages When the MC2000 senses a problem with the chopper operation it will display various messages to help identify the source of the problem Freq Not Locked This indicates that the chopper speed could not lock to the set frequency or the external reference If this occurs check the unit has been set to the correct blade as indicated on power up If th...

Страница 20: ...ed when operating at 230 VAC Phillips Head Screwdriver 2 Preferred Motorized screwdrivers are not recommend 8 2 Fuse Replacement and Line Voltage Selection 1 Important Make sure the power cord optical head and any external devices are disconnected before continuing See warning above 2 Remove the two screws securing the enclosure cover with a Phillips head screwdriver The screws are located on the ...

Страница 21: ...Chopper System 18488 D02 Rev G September 24 2012 Page 21 www thorlabs com Front Back Figure 3 Circuit Board Layout with 110 220 VAC Switch Line Voltage Selection Switch Set the switch to the appropriate voltage ...

Страница 22: ...g Setup Display Store Adjust Harmonic Reference Blade Selects the blade type Exit Intensity Sets the LCD display brightness OFF ON Turns the display on and off Exit Store Recall Erase Exit Freq Sets the frequency Phase Sets the phase Exit Harm N Sets the N harmonic Harm D Sets the D harmonic Exit Ref In Selects the reference in Ref Out Selects the reference out Exit ...

Страница 23: ... MC1F15 15 slot 0 68 rms 0 27 rms Typ MC1F30 30 slot 1 10 rms 0 45 rms Typ MC1F60 60 slot 1 10 rms 0 78 rms Typ MC2F57 2f slot 0 38 rms 0 08 rms Typ Frequency Drift 20 ppm C Chopping Range Harmonic 2 to 15x Sub Harmonic 1 2 to 1 15x Input Output Specifications Ext Input Compatibility TTL CMOS Ext Input Voltage Range 2 0 5 V Input High 2 V Input Low 0 8 V Ext Input Impedance 200Ω Ref Out Compatibil...

Страница 24: ...ions Chopping Blade Diameter Ø4 0 Ø101 6 mm Chopping Blade Thickness 0 010 0 254 mm Mounting Base 1 4 20 or M8 Clearance Slots Spaced 3 0 Compatible with Thorlabs Breadboards Mounting Hole 1 4 20 with 1 4 Max Screw Depth Blade Specifications Chopping Blade Slots 4 MC1F2 2 MC1F10 Default Blade 10 MC1F15 15 MC1F30 30 MC1F60 60 MC2F57 7 Outer 5 Inner Slot Angle MC1F2 180 MC1F10 Default Blade 36 MC1F1...

Страница 25: ...wer 20 VA Max Fuse Ratings 250 mA 115 VAC 125 mA 230 VAC Fuse Type IEC60127 2 III 250 V Slo blo Type T Fuse Size 5 x 20 mm 1 The MC2000 is shipped with a 120 VAC US style power cord while the MC2000 EC is shipped with a 230 VAC power cord 2 The reference output and external input is short circuit protected by limiting the current to 25mA Over and Under voltage protection is available but continued...

Страница 26: ...Optical Chopper System 18488 D02 Rev G September 24 2012 Page 26 www thorlabs com Part 11 Drawings 11 4 290 mm 5 8 146 mm 2 6 66 mm Figure 4 Console Dimensional Drawing ...

Страница 27: ...r System 18488 D02 Rev G September 24 2012 Page 27 www thorlabs com 1 3 32 mm R1 9 R48 mm R1 5 R38 mm 2 9 75 mm 3 6 90 mm 2 9 74 mm 3 8 95 mm 2 2 56 mm 0 4 10 mm Ø4 0 Ø102 mm Figure 5 Chopper Head Dimensional Drawing ...

Страница 28: ...Thorlabs products such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by the user PCB s housings etc If you wish to return a Thorlabs unit for waste recovery please contact Thorlabs or your nearest dealer for further information 12 1 Waste Treatment is Your Own Responsib...

Страница 29: ...Optical Chopper System 18488 D02 Rev G September 24 2012 Page 29 www thorlabs com Part 13 Certificate of Conformity ...

Страница 30: ...Optical Chopper System 18488 D02 Rev G September 24 2012 Page 30 www thorlabs com ...

Страница 31: ...horlabs com Scandinavia Thorlabs Sweden AB Mölndalsvägen 3 412 63 Göteborg Sweden Tel 46 31 733 30 00 Fax 46 31 703 40 45 www thorlabs com Email scandinavia thorlabs com France Thorlabs SAS 109 rue des Côtes 78600 Maisons Laffitte France Tel 33 0 970 444 844 Fax 33 0 825 744 800 www thorlabs com Email sales fr thorlabs com Brazil Thorlabs Vendas de Fotônicos Ltda Rua Riachuelo 171 São Carlos SP 13...

Страница 32: ......

Страница 33: ...www thorlabs com ...

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