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Liquid Crystal Controller

18828-D02 Rev F, Sept 23, 2011 Page

15

www.thorlabs.com

5.3. Troubleshooting

Problem

Solutions

Unit will not power up. LCD display not
illuminating, unit is not functioning

Check the power switch is in the ON position,
the mains connection is correct, and the fuse
has not been damaged.

DC Offset Error

If Error appears on LCD. Disconnect LC
device from the output of the LCC25. Cycle
power switch to reset parameters. If ERROR
reappears, please contact Thorlabs technical
support for assistance.

Note: The LCC25 circuitry has been designed to monitor and correct the DC offset in real
time. This will increase the life of the Liquid Crystals. For any unforeseen reason DC
offset is detected above the ±10 mV limit enabling the DC OFFSET ERROR to appear.
To eliminate damage to the LC device disconnect from LCC25 output BNC.

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Содержание LCC25

Страница 1: ...LCC25 Liquid Crystal Controller Operating Manual ...

Страница 2: ...and Modulation Frequency 7 Setting the Output 8 Internal Modulation Frequency 8 External Modulation Frequency 8 Computer Controlled Operation 9 3 1 LCC25 Controls and Features 11 Part 4 LCC25 Specifications 12 4 1 Mechanical Drawing 13 Part 5 Maintenance 14 5 1 Fuse Replacement 14 5 2 Ventilation 14 5 3 Troubleshooting 15 Part 6 Warranty Information 16 Part 7 Declaration of Conformity 17 Part 8 Re...

Страница 3: ...om Table of Figures Figure 1 A 2 kHz Square Wave Output with no Additional Modulation 5 Figure 2 A 2 kHz Square Wave Output with 150 Hz Modulation 6 Figure 3 Front Display 6 Figure 4 LCC25 Front Panel 11 Figure 5 LCC25 Rear Panel Features 11 Figure 6 LCC25 Mechanical Drawing 13 ...

Страница 4: ...it must not be operated in explosive environments Unit is supplied with a 115 V parallel blade line cord for North American use only For all other applications use an IEC 320 compatible line cord fitted with a plug appropriate for your particular AC wall socket Make sure that the line voltage rating marked on the rear panel agrees with your local supply and that the appropriate fuses are installed...

Страница 5: ...etardance of the LC device The LCC25 produces a 2 kHz AC square wave with an amplitude that is adjustable from 0 to 25 VRMS The unit features two selectable set points Voltage 1 and Voltage 2 Both set points are controlled by the user and they produce a square wave that is plus minus the set point For example if the user sets Voltage 1 to 15 000 the output would be a 15 000V 2 kHz square wave see ...

Страница 6: ...e and frequency and then using the knob to adjust the levels The system s display is a 16 x 2 LCD which displays the voltages and frequency see figure 3 There are two BNC connectors The top BNC is the external input and allows the user to input an external modulation frequency square wave up to 5 volts The bottom BNC is the system output Figure 3 Front Display The LCC25 may also be controlled by a...

Страница 7: ...ss the display Voltage 1 Voltage 2 and the Frequency then will be displayed BNC Output and External input LED indicators will be OFF This is the default state when the unit is power on Setting the Voltage and Modulation Frequency There is a set of 6 buttons beneath the LCD display and a knob for adjustment to the left of the display To change Voltage 1 press the VOLTAGE 1 key the LCD top left will...

Страница 8: ...ected frequency Internal Modulation Frequency The LCC25 has internal modulation frequency adjustable from 0 5 to 150 Hz To use the internal modulation the LED next to the EXT INPUT BNC connect should be off If it is lit press the INT EXT key disabling the LED indicator To adjust the modulation frequency push the FREQ key and adjust the knob to the desired output External Modulation Frequency The L...

Страница 9: ... prompt The basic structure of the interface is a keyword followed by either an equals sign or a question mark The or will determine if the string is a command or a query All strings commands and queries must be terminated by a carriage return CR or pressing the ENTER key on the computer The command structure is as follows Keyword argument CR Where keyword defines the function and argument is a nu...

Страница 10: ...ers save Stores parameters in static memory Restore Default Parameters default Restores the initial factory settings Set Test Mode Dwell Time mS dwell n Sets the dwell time for LC Test Mode Get Test Mode Dwell Time mS dwell Returns the current dwell time for LC Test Mode Set Test Mode Increment V increment n Sets the voltage step increment for LC Test Mode Get Test Mode Increment V increment Retur...

Страница 11: ...2011 Page 11 www thorlabs com 3 1 LCC25 Controls and Features Figure 4 LCC25 Front Panel Figure 5 LCC25 Rear Panel Features Rotary Knob LCD Display External Input BNC Main Power Switch Function Keys Output BNC AC Input Connector IEC and Fuse Drawer USB ...

Страница 12: ...olution 1 0 mV Adjustable Internal Modulation Frequency 0 5 to 150 Hz 50 Duty Cycle Switching Frequency 2 000 5 Hz 50 Duty Cycle Slew Rate 10 V μs DC offset 10 mV AC Power 85 264 VAC 47 63 Hz 25 VA Warm Up Time 30 Minutes Physical Features External Input Connector BNC External Input Enable Front Panel INT EXT enable Key External Input Indicator Green LED Output Connector BNC Output Enable Front Pa...

Страница 13: ...id Crystal Controller 18828 D02 Rev F Sept 23 2011 Page 13 www thorlabs com 4 1 Mechanical Drawing 5 758 146 26mm 2 586 65 69mm 3 066 77 88mm 290 2mm 11 425 12 160 308 88mm Figure 6 LCC25 Mechanical Drawing ...

Страница 14: ...lly use a flat blade screwdriver to open the fuse tray Remove the existing fuse and install the appropriate 500mA fuse The replacement fuse must be a 5 mm x 20 mm 250 VAC Type T Fuses IEC 60127 2 III low breaking capacity slow blow see fuse specification below Push the fuse tray back into place making sure that it snaps and seats correctly Connect the appropriate power cord into the AC receptacle ...

Страница 15: ...Error If Error appears on LCD Disconnect LC device from the output of the LCC25 Cycle power switch to reset parameters If ERROR reappears please contact Thorlabs technical support for assistance Note The LCC25 circuitry has been designed to monitor and correct the DC offset in real time This will increase the life of the Liquid Crystals For any unforeseen reason DC offset is detected above the 10 ...

Страница 16: ... manual of each laser Opto Electronics Control Electronics Optics and Nano Positioning Product Lines Thorlabs offers a two year warranty on the above mentioned product lines provided normal use and maintenance of the products and when properly handled and correctly installed Thorlabs shall repair or replace any defective or nonconforming product as detailed above We ask that buyer contact Thorlabs...

Страница 17: ...Liquid Crystal Controller 18828 D02 Rev F Sept 23 2011 Page 17 www thorlabs com Part 7 Declaration of Conformity ...

Страница 18: ...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 8 1 Waste Treatment is Your Own Responsibi...

Страница 19: ...at Britain Tel 44 0 1353 654440 Fax 44 0 1353 654444 www thorlabs com Email sales uk thorlabs com Support techsupport uk 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 Scandinavia Thorlabs Sweden AB Mölndalsvägen 3 412 63 Göteborg Sweden Tel 46 31 733 30 00 Fax 46 31 703 40 45 w...

Страница 20: ...www thorlabs com ...

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