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MC2000B, MC2000B-EC

Optical Chopper

User Guide

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Summary of Contents for MC2000B

Page 1: ...MC2000B MC2000B EC Optical Chopper User Guide ...

Page 2: ...ignal 11 6 1 2 Selecting the REFERENCE OUT signal 11 6 2 External Reference Mode 11 6 2 1 Selecting the REFERENCE IN signal 11 6 2 2 Selecting the REFERENCE OUT signal 11 6 3 Harmonic Reference Generation 12 6 3 1 Selecting the REFERENCE IN signal 12 6 3 2 Setting the Sub Harmonic 12 6 3 3 Combining the Harmonic and Sub Harmonic Modes 12 6 3 4 Selecting the REFERENCE OUT signal 12 6 4 Two Frequenc...

Page 3: ...nance and Troubleshooting 20 9 1 Cleaning 20 9 2 Diagnostic Messages 20 Chapter 10 Fuse Replacement and Line Voltage Selection 21 10 1 Materials Needed 21 10 2 Fuse Replacement and Line Voltage Selection 21 Chapter 11 Visual Menu Structure 23 Chapter 12 Specifications 24 12 1 Blade Specifications 24 12 2 Performance Specifications 26 Chapter 13 Mechanical Drawing 28 13 1 Console Dimension Drawing ...

Page 4: ...Description Direct Current Alternating Current Both Direct and Alternating Current Earth Ground Terminal Protective Conductor Terminal Frame or Chassis Terminal Equipotentiality On Supply Off Supply In Position of a Bi Stable Push Control Out Position of a Bi Stable Push Control Caution Risk of Electric Shock Caution Hot Surface Caution Risk of Danger Warning Laser Radiation Caution Spinning Blade...

Page 5: ...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 in Section 5 Thorlabs ships all MC2000B units configured to operate in the United States i e line voltage 115 VAC 60 Hz and 250 mA Slow Blo fuse installed and all MC...

Page 6: ...quency chopping from a single blade Special Inner Outer 4 7 5 7 3 30 8 60 and 53 60 harmonic blades are available These slot combinations split single beams for individual modulation in ratio metric experiments Another example application is a pump probe experiment where the pump beam is modulated at the outer frequency and a probe beam is modulated at the inner frequency The MC2000B provides the ...

Page 7: ...s Frequency Notes High Precision Chopper Blades MC1F2 2 100 4 Hz 200 Hz MC1F2P10 2 100 4 Hz 200 Hz Not compatible with the MC2000 MC1F10HP 10 100 20 Hz 1 kHz This blade is included with the MC2000B Not compatible with the MC2000 Single Frequency Chopper Blades MC1F10 10 20 Hz 1 kHz MC1F15 15 30 Hz 1 5 kHz MC1F30 30 60 Hz 3 kHz MC1F60 60 120 Hz 6 kHz MC1F100 100 200 Hz 10 kHz ...

Page 8: ...tible with the MC2000 Note The Harmonic Frequency Chopper Blades are designed for the MC2000B Optical Chopper and are not supported by the MC2000 Photo Item Slots Frequency Inner Frequency Outer Frequency Harmonic Frequency Chopper Blades MC2F47 4 7 8 Hz 400 Hz 14 Hz 700 Hz MC2F57B 5 7 10 Hz 500 Hz 14 Hz 700 Hz MC2F330 3 30 6 Hz 300 Hz 60 Hz 3 kHz MC2F860 8 60 16 Hz 800 Hz 120 Hz 6 kHz MC2F5360 53...

Page 9: ...gnal 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 supplied for US operation Fuse Holder The system fuse is installed here USB 2 0 Port Control Knob This knob is used to highlight and select menu items Ext Input The...

Page 10: ...hillips Pan Head Screws with Internal Tooth Washers 2 Remove the three 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 connect it to the chopper blade hub using the three 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 ...

Page 11: ...ic to 1 Harm D Set the D harmonic to 1 3 Highlight and select Run Mode The unit will adjust the speed of the blade and lock onto the set speed within a few seconds 5 2 External Reference Operating Mode This mode allows the user to control the chopper blade with a logic level external reference signal 1 To enable external reference mode attach a TTL or CMOS logic level reference signal at the requi...

Page 12: ...nce in signal obtained from the reference input connector EXT Input synchronized and locked to the inner slots of a 2 100 slot or 10 100 slot blade Note This menu item is only displayed when these blades are selected 5 4 Reference Out Signal The MC2000B supports a number of different reference out signals For reference output selection highlight and select the external reference out signal from th...

Page 13: ... found under the Reference menu On Cycle The duty cycle is presented in percent increments 1 to 50 with 50 percent equal to a 50 slot opening Note This menu is only present when an adjustable blade is selected Figure 1 The MC1F10A Adjustable Duty Cycle Blade For example the blade shown above is physically set for 20 and the On Cycle scroll bar is also set for 20 as seen in the figure below Figure ...

Page 14: ...ference output yields better performance i e when synchronizing multiple choppers See section 5 4 on page 9 and section 6 4 2 on page 13 for setting the reference out for special blades 6 2 External Reference Mode A major benefit of using a PLL circuit to control the chopper wheel speed is that the chopper locks precisely to an external reference signal This allows the MC2000B is used in advanced ...

Page 15: ...e setup procedures for internal reference operating mode in section 5 1 on page 8 6 3 2 Setting the Sub Harmonic Highlight and select the reference harmonic N menu item and enter a scroll bar value between 1 and 15 Highlight and select the reference harmonic D menu item and enter a scroll bar value between 1 and 15 6 3 3 Combining the Harmonic and Sub Harmonic Modes The sub harmonic divider follow...

Page 16: ...ides two additional reference outputs in this mode The sum SUM and the difference DIFF reference frequencies track the combined signal paths when they are frequency mixed together The example below illustrates this For example an MC2000B 5 7 blade is set to run the outer blade set at 70 Hz The inner blade by virtue of the ratio of inner to outer slots will be running at 50 Hz If a light path is co...

Page 17: ...cting the REFERENCE IN Signal If operated as a stand alone unit the internal reference signal will most likely be set to the inner INT OUTER mode for the highest stability and least amount of jitter 6 5 2 Selecting the REFERENCE OUT Signal If operated as a stand alone unit the external reference out signal will most likely be set to the inner INNER mode This will set the external reference out and...

Page 18: ...ycle capability Engraved rulings on the outer edge of the blade are included for adjustability For proper mounting of the blade align the engraved dots on the MC1F10 and MC1F10A so they overlap Manually adjust the duty cycle and tighten the mounting screws Figure 3 Adjustable Duty Cycle Blade Note Follow the operating mode setup procedures in Chapter 5 on page 8 for normal operation Engraved Dot A...

Page 19: ... 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 connection is correct you will see the following after pressing the Enter key Command error CMD_NOT_DEFINED Followed immediately by the prompt The basic structure of the interface is a keyword f...

Page 20: ... dharmonic Returns the Harmonic Divider Set Phase phase n Set the Phase adjust 0 360 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 See blade dependent reference input Get Reference ref Returns the reference mode Set Ref Output output n Set the output reference mode See blade depen...

Page 21: ...y index blade type using the numbers from 0 to 14 The following table provides the mapping Photo Blade Index Photo Blade Index MC1F2 0 MC1F6P10 8 MC1F10 1 MC1F10A 9 MC1F15 2 MC2F330 10 MC1F30 3 MC2F47 11 MC1F60 4 MC2F57B 12 MC1F100 5 MC2F860 13 MC1F10HP 6 MC2F5360 14 MC1F2P10 7 8 3 Blade Dependent Reference Input Reference mode can be gotten or set through the command line interface using the comm...

Page 22: ...F57B 0 1 MC2F860 0 1 MC2F5360 0 1 8 4 Blade Dependent Reference Output Reference mode can be gotten or set through the command line interface using the commands output and output n respectively The following table provides the mapping Blade Target Actual Outer Inner Sum Diff MC1F2 0 1 2 MC1F10 0 1 MC1F15 0 1 MC1F30 0 1 MC1F60 0 1 MC1F100 0 1 MC1F10HP 0 1 2 MC1F2P10 0 1 2 MC1F6P10 0 1 MC1F10A 0 1 M...

Page 23: ...the wheel remove it from the optical head and wipe it clean with a cloth dampened in isopropyl alcohol To help prevent the chopper wheel from rusting in high humidity environments wipe the blade with a clean rag sprayed with a light lubricating rust inhibitor e g WD40 or similar 9 2 Diagnostic Messages During normal operation a run time diagnostic message is displayed indicating whether the choppe...

Page 24: ... and must be used when operating the unit at 220 230 VAC Phillips Head Screwdriver 2 Preferred Motorized screwdrivers are not recommend 10 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 T...

Page 25: ...opper Chapter 10 Fuse Replacement and Line Voltage Selection Page 22 TTN102010 D02 Figure 4 Circuit Board Layout with 110 220 VAC Switch Front Back Line Voltage Selection Switch Set the switch to the appropriate voltage ...

Page 26: ... blade spinning Reference Harmonic General Presets Exit Exit Exit Exit Exit Blade Selects the blade type Ref In Selects the reference in Harm N Sets the N harmonic Harm D Sets the D harmonic Ref Out Selects the reference out Freq Sets the frequency Phase Sets the phase OFF ON Turns the display on and off Setup Auto Run Back Light Display Erase Recall Store ...

Page 27: ...C2F330 30 Outer 3 Inner MC2F47 7 Outer 4 Inner MC2F57B 7 Outer 5 Inner MC2F860 60 Outer 8 Inner MC2F5360 60 Outer 53 Inner Slot Angle MC1F2 180 MC1F10 36 MC1F15 24 MC1F30 12 MC1F60 6 MC1F100 3 6 MC1F10HP Default Blade 3 6 Outer 36 Inner MC1F2P10 180 MC1F6P10 60 MC1F10A Adjustable MC2F330 12 Outer 120 Inner MC2F47 51 4 Outer 90 Inner MC2F57B 51 4 Outer 72 Inner MC2F860 6 Outer 45 Inner MC2F5360 6 O...

Page 28: ... 120 6 kHz Inner 16 800 Hz MC2F5360 2f slot Outer 120 6 kHz Inner 106 5 3 kHz Phase Jitter One Blade Rotation MC1F2 2 slot 0 2 rms 0 1 rms Typ MC1F10 10 slot 0 3 rms 0 2 rms Typ MC1F15 15 slot 0 3 rms 0 15 rms Typ MC1F30 30 slot 0 3 rms 0 15 rms Typ MC1F60 60 slot 0 2 rms 0 1 rms Typ MC1F100 100 slot 0 2 rms 0 1 rms Typ MC1F10HP 2f slot Default Blade 0 2 rms 0 1 rms Typ MC1F2P10 2 slot 10 0 2 rms ...

Page 29: ... D 6 05 x 2 88 x 11 54 153 6 mm x 73 2 mm x 293 1 mm Input and Output Connectors BNC Menu Control Twist Push Button Knob Input Power Connection5 IEC Connector Weight 5 lbs 9 1 lbs Shipped Weight Operating Temperature 10 40 C Display Type 240 x 124 Pixel LCD Graphics Display Frequency Resolution 1 Hz 10 15 30 60 and 100 Single Frequency Blades 1 Hz 4 7 5 7 3 30 8 60 and 53 60 Harmonic Blades 0 1 Hz...

Page 30: ...er Supply Supply Type Linear Voltage Selection Switch Selectable between 115 230 VAC Input Voltage 100 115 VAC 10 230 VAC 10 Line Frequency 50 60 Hz Input Power 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 ...

Page 31: ...B Optical Chopper Chapter 13 Mechanical Drawing Page 28 TTN102010 D02 Chapter 13 Mechanical Drawing 13 1 Console Dimension Drawing 2 88 73 2 mm 6 05 153 6 mm 11 54 293 1 mm Figure 5 Console Dimension Drawing ...

Page 32: ...al Drawing Rev A Jul 5 2016 Page 29 13 2 Chopper Head Dimension Drawing 2 95 74 9 mm 1 28 32 5 mm 3 75 95 3 mm 3 56 90 4 mm 2 92 74 3 mm 2 20 55 9 mm 0 40 10 2 mm Ø3 75 95 3 mm R1 50 38 1 mm Ø4 00 101 6 mm Figure 6 Chopper Head Dimension Drawing ...

Page 33: ...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 Waste Treatment is Your Own Responsibility...

Page 34: ...MC2000B Optical Chopper Chapter 15 Declaration of Conformity Rev A Jul 5 2016 Page 31 Chapter 15 Declaration of Conformity ...

Page 35: ...e thorlabs com Scandinavia Thorlabs Sweden AB Bergfotsgatan 7 431 35 Mölndal 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 ...

Page 36: ...www thorlabs com ...

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