THORLABS MC1000 Operating Manual
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THORLABS MC1000 Operating Manual

THORLABS MC1000 Operating Manual

Opto-mechanical chopper chopper mechanical chopper
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MC1000
MC1000
MC1000
MC1000
Opto- - - - Mechanical Chopper
Opto
Mechanical Chopper
Opto
Opto
Mechanical Chopper
Mechanical Chopper
Operating Manual
MODEL MC1000 OPTICAL CHOPPER
EXT REF IN
EXT EN
PHASE ADJ
REF
SELECT
REF OUT
THORLABS, Inc.
435 Route 206N
Newton, NJ 07860 USA
FREQUENCY
FREQ UP
CYCLE
FREQ DOWN
ENTER
PWR
SET
SET
RECALL
SAVE
N
D
SETUP
SETUP
MODE
Doc 1693-D03 Revision B 6/6/00
Ph: (973) 579-7227
Fax: (973) 300-3600
www.thorlabs.com

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Summary of Contents for THORLABS MC1000

  • Page 1 MC1000 MC1000 MC1000 Opto- - - - Mechanical Chopper Opto Mechanical Chopper Opto Opto Mechanical Chopper Mechanical Chopper Operating Manual MODEL MC1000 OPTICAL CHOPPER FREQUENCY FREQ UP CYCLE EXT REF IN EXT EN FREQ DOWN ENTER PHASE ADJ RECALL SAVE...

  • Page 2: Table Of Contents

    Doc. No. 1693-D03 Revision B 6/6/00 Table of Contents TABLE OF CONTENTS GETTING STARTED QUICKLY Setup Internal Reference Operating Mode External Reference Mode SECTION 1.0 OVERVIEW SECTION 2.0 DESCRIPTION Optical Head Controller Front Panel Features Controller Rear Panel Features SECTION 3.0 OPERATING INSTRUCTIONS Internal Frequency Synthesizer Setup for Internal Reference Frequency Selecting the REFERENCE OUT signal...

  • Page 3: Getting Started Quickly

    Note: the MC1000 can be operated from 100-120VAC or 220-240VAC. A voltage selector switch is located inside of the MC1000 controller. If you are not sure what operating voltage your unit is set to, proceed immediately to Section 6.0 for instructions on setting the operating voltage.

  • Page 4: Section 1.0 Overview

    Unlike conventional, open-loop speed control designs, the PLL speed control circuit also allows the MC1000 chopper to be synchronized to external reference signals, including other MC1000 choppers and reference sources such as DSP lock-in amplifiers. The phase of the MC1000 chopper wheel is continuously adjustable from -π to +π (-180° to +180°).

  • Page 5: Section 2.0 Description

    Doc. No. 1693-D03 Revision B 6/6/00 Section 2.0 Description Optical Head The optical head consists of a precision photo-etched chopper wheel, a high-quality Swiss DC motor, a machined aluminum housing, and the photo-interrupter motion detection electronics. The key features of the chopper head are highlighted in Figure 1.

  • Page 6: Controller Front Panel Features

    It is also used for as an enter key when setting the various operating parameters. 4 PWR button - Press in to power the MC1000 on. 5 MODE - Pressing this key cycles through the various input modes (REF SELECT, SET N, SET D, RECALL and SAVE).
  • Page 7 13 EXT REF IN - the external reference signal is connected to this input BNC (TTL / CMOS logic level). 14 EXT EN - Pressing this key toggles the MC1000 between the internal and external reference mode. When the unit is in the external reference mode, the LED next to this key is lit.

  • Page 8: Controller Rear Panel Features

    Doc. No. 1693-D03 Revision B 6/6/00 Controller Rear Panel Features Manufactured by Newton, NJ USA POWER 10W MAX. 115VAC 50-60Hz 250mA Type T FUSE RS-232 125mA Type T FUSE 230VAC 50-60Hz OPTICAL HEAD Figure 3. Rear Panel Feature Description 1 RS-232 Serial Port Connector 2 Modular interface connector for the optical head 3 Cooling fan 4 AC input and fuse receptacle...

  • Page 9: Section 3.0 Operating Instructions

    Section 3.0 Operating Instructions Internal Frequency Synthesizer The MC1000 is most frequently used in this mode where the chopper wheel frequency is locked to an internal crystal stabilized frequency reference. The PLL motor speed control circuit maintains a precise lock to the frequency and phase of the internal reference frequency creating an ultra-stable chopping signal.

  • Page 10: External Reference Mode

    The MC1000 will accept a TTL or CMOS logic level input as an external reference. The advanced PLL design used in the MC1000 even accepts reference signals that do not have a 50% duty cycle. A special feature of the external reference mode, locking to harmonics and sub-harmonics of the reference signal, is describe in the following section.

  • Page 11: Setting The Sub-Harmonic

    Example: The MC1000 is set to run the outer blade set at 70Hz. The inner blade, by virtue of the ratio of inner to outer slots will be running at 50Hz. If a light path is common to both the inner and outer blades, the signal will see a sum frequency of 120Hz and a difference frequency of 20Hz.

  • Page 12: Adjusting The Chopper Phase

    2. The firmware revision level is displayed (please take note of this number when calling tech support). 3. The current blade setting is displayed. At this point, the MC1000 can be set to the appropriate blade if the displayed setting does not match the blade installed on the optical head. The choices are:...

  • Page 13: Section 4.0 Serial Interface

    The user can select the various commands by typing the letter enclosed in parenthesis at the beginning of each line and the MC1000 will prompt for the user input. Typing the RETURN key will exit the input mode without changing the value.

  • Page 14: Serial Command Summary

    Command: Input Parameters: none Description: When the echo mode is on the current display on the MC1000 front panel will be sent to the serial port each time it is updated. Command: Input Parameters: ‘0’ for 10 slot, ‘1’ for 15 slot, ‘2’ for 30 slot, ‘3’ for 2-frequency blade Description: This programs the MC1000 for the chopper blade currently installed on the optical head.

  • Page 15: Section 5.0 Specifications

    Doc. No. 1693-D03 Revision B 6/6/00 Section 5.0 Specifications Optical Head Dimensions: Performance Specifications Chopping Frequency: 10 Slot Blade 20 - 1000Hz 15 Slot Blade 30 - 1500Hz 30 Slot Blade 60 - 3000Hz 2-f Blade 14/10 - 700/500 (outer/inner) <20 ppm / °C Frequency Drift: Phase Jitter (at 1kHz):...

  • Page 16: Section 6.0 Maintenance & Troubleshooting

    Replace the fuse with the type fuse indicated on the rear panel. Cleaning The MC1000 should only be cleaned with a soft cloth and mild soap detergent or isopropyl alcohol. Do not use a solvent based cleaner.
  • Page 17 Doc. No. 1693-D03 Revision B 6/6/00 You may use any of the following methods to contact Thorlabs in case of difficulty or if you have questions regarding your MC1000. Please take not of the firmware revision level to help us in your assistance.

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