Sacher Lasertechnik LB2001 Operating Manual
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Sacher Lasertechnik LB2001 Operating Manual

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Operation Manual LB2001
_____________________________________________________________________________________________________
Operating Manual
Servo Controller LB2001
Adress:
Tel.:
+49 (6421) 305-0
Sacher Lasertechnik GmbH
Fax.:
+49 (6421) 305-299
Rudolf-Breitscheid-Str. 1-5
EMail: contact@sacher-laser.com
D-35037 Marburg, Germany
Web: http://www.sacher-laser.com
Sacher Lasertechnik
Sacher Lasertechnik, LLC
Tel.: 1-714-670-7605
5765 Equador Way
Fax: 1-714-670-7662
Buena Park, CA 90620, USA
Email: sales@sacher-
laser.com
GmbH
Page 1
Version:
Preliminary 2011-01-01

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Summary of Contents for Sacher Lasertechnik LB2001

  • Page 1 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Operating Manual Servo Controller LB2001 Adress: Tel.: +49 (6421) 305-0 Sacher Lasertechnik, LLC Tel.: 1-714-670-7605 Page 1 Sacher Lasertechnik GmbH Fax.: +49 (6421) 305-299 5765 Equador Way Fax: 1-714-670-7662 Version: Rudolf-Breitscheid-Str. 1-5 EMail: contact@sacher-laser.com...

  • Page 2: Basic Safety Instructions

    _____________________________________________________________________________________________________ 1. Basic Safety Instructions The LB2001 is a versatile instrument that can be used in a variety of feedback control applications. However, the LB2001 is not intended for fail-safe operation in hazardous environments or life-threatening situations. The user assumes full responsibility for correct and safe usage of the LB2001 in accordance with any applicable laws, codes, regulations, and standards pertaining to their specific application.
  • Page 3 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Table of Symbols Alternating current Caution – risk of electrical shock Fuse It is well known that WEEE pollutes the environment by releasing toxic products during decomposition. The aim of the European RoHS directive is to reduce the content of toxic substances in electronic products in the future.

  • Page 4: Customer Support

    Buena Park, CA 90620 The LB2001 is designed to be maintenance free. No user-serviceable parts are inside the unit. No further calibrations are necessary for the LB2001 to meet its accuracy specifications over the lifetime of the product. Opening the instrument case voids the warranty and exposes to user to hazardous voltages that are present inside the instrument case.
  • Page 5 Lasertechnik without a Return Merchandise Authorization (RMA). Return the unit, postage prepaid, to Sacher Lasertechnik. Do not forget to write the RMA on the shipping label. Sacher Lasertechnik will refuse and return any package that does not bear an RMA.
  • Page 6 The LB2001 should not be used in a manner not specified by the manufacturer.

  • Page 7: Prepare For Use

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 3. Prepare for Use This chapter gives an overview of the front panel controls and connectors of the LB2005 servo controller and gives all information that is necessary to put the instrument into operation and connect external devices.
  • Page 8 Bias voltage level. The position of the LED signal indicates the position of the bias voltage level relative to the +/-10V operation range of the LB2001 Save Switch remote indicator. When “Save” is pressed all settings will be stored in a...
  • Page 9 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Polarity switch for PT1 and DT1 filter unit Corner frequency (CF) / Attenuator selection switch Filter selection switch. Sweep Center (Output Offset): This knob adjusts the offset voltage of the signal from Output. The offset voltage can be adjusted from the negative voltage limit (fully counter clockwise) to the positive voltage limit (fully clockwise).

  • Page 10: Rear Panel Tour

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 3.2. Rear Panel Tour Input A (non inverting input), The error signal is generated from the voltage (A – B) applied to the BNC input connector USB Remote Interface. Input B (inverting input), The error signal is generated from the voltage applied to the...
  • Page 11 Sweep In 1: This BNC input allows a low frequency periodic sweep signal to be added to the output of the LB2001. The input impedance is 1k  a nd the input voltage range is -10V.. +10V. See Sweep Center and Sweep Span controls discussed below for more details.

  • Page 12: Table Of Contents

    6. Remote Interface....................31 6.1. Architecture ....................31 6.2. Serial Port Emulation................... 32 6.3. Serial Port Commands ................32 6.4. LB2001 Terminal ..................33 7. Specifications ..................... 34 7.1. Performance Specifications................. 34 7.2. Environmental Specifications ..............35 7.3. Electrical Specifications................35 7.4.

  • Page 13: Getting Started

    Demanding applications will require familiarity with feedback control theory and good characterization of all system components. The primary function of the LB2001 is to condition an input signal from a detector and to provide an output signal to a transducer that controls a system parameter. The output control signal forces the system parameter to a desired value regardless of external disturbances, such as thermal fluctuations or mechanical noise, which invariably affect the system.
  • Page 14 Be careful not to exceed any input voltage limits of the bias-tee. If necessary, the Output voltage of the LB2001 can be limited by setting the Output Voltage Limit trim pots located on the rear panel. See section Setting Output Voltage Limits in Chapter 3 for more details.

  • Page 15: Typical Operation

    Typical Operation 4.3. The controls of the LB2001 are conveniently arranged for acquiring and optimizing lock. In this section, five steps are suggested that will meet the needs of most applications. Figure 5 shows the controls that are most likely to be adjusted for each step. The solid lines indicate controls that are used most often, while the dashed lines show controls that are less frequently adjusted.
  • Page 16 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Acquire lock: The Acquire toggle switch offers two gain settings for turning on the feedback control. When acquiring lock, sometimes it is helpful to limit the DC gain of the integrator. The LFGL position is an intermediate lock mode that applies the P-I filter with a low frequency gain limit.

  • Page 17: System Overview

    5. System Overview 5.1. Signal Architecture The LB2001 is comprised of 4 stages of analog signal processing. The following picture shows the different sections and how the various input signals are used to derive the output signal. Each section is briefly described below.

  • Page 18: Input Section

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 5.2. Input Section The input section is a difference amplifier with an adjustable voltage offset (U Bias). Common-mode voltages ranging from ±10V can be subtracted. Error signals (observed at the Error Monitor Output) that exceed the voltage range ±330 mV...

  • Page 19: Pi Filter

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 5.3. PI Filter This section converts the error signal to a control signal with a proportional-integral (P-I) filter. Front panel controls adjust the overall loop gain, the P-I corner frequency, and an optional low-frequency gain limit. A toggle switch is used to disable/enable the output of the P-I filter for acquiring lock.
  • Page 20 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ The PI Filter is fully configured on the front panel with the following elements Filter Mode switches Output Level Indicator PI Filter Parameter Display Gain Level adjust Low Frequency PI Corner adjust Gain Limit adjust...
  • Page 21 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ The following graphs showed the frequency response of the PI Filter in both modes and Frequency Response Prelock Mode with 3 different LFGL Levels Frequency Response Lock Mode with 3 different corner frequencies Sacher Lasertechnik, LLC Tel.: 1-714-670-7605...
  • Page 22 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Filter parameters are limited to the values described in the next table. PI Corner OFF, 10Hz, 30Hz, 100Hz, 300Hz 1kHz,30kHz,100kHz,300kHz, 1MHz Low Frequency Gain Limit 0dB 10dB 20dB 30dB 40dB 50dB,60dB,70dB,80dB Gain -40dB .. +40dB...

  • Page 23: Post Dt1 Filter

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 5.4. Post DT1 Filter This section processed the PI Filter output to a control signal which is given to the Output HP connector on the rear panel. Front panel controls adjust the corner frequency and attenuation.
  • Page 24 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ The following graphs showed the frequency response of the DT1 Filter Frequeny Response DT1 Filter with 4 different corner frequencies Only 4 different corner frequencies are possible to adjust. Display Corner Frequency ( fdt1) 0.4 Hz...
  • Page 25 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ The following graphs showed the relationship between attenuation number and real attenuation The attenuator is controlled by a 6 bit number. The range is 0 to 63 The whole frequency response of the DT1 Post filter could be described by following equation.

  • Page 26: Post Pt1 Filter

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 5.5. Post PT1 Filter This section processed the PI Filter output to a control which is given to the summing amplifier. Front panel controls adjust the corner frequency and attenuation. A toggle switch is used to invert the polarity.
  • Page 27 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ The following graphs showed the frequency response of the PT1 Frequeny response PT1 Filter with 4 different corner frequencies Only 4 different corner frequencies are possible to adjust. Display Corner Frequency ( fpt1)
  • Page 28 Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ Two attenuators are placed after the filter sections. The first attenuator (ATT1) is controlled by a 2 bit word. Possible settings are Attenuation = 0 dB Attenuation = -6 dB Attenuation = -9 dB Attenuation = -20 dB The second attenuator is controlled by a 6 bit number.

  • Page 29: Frequency Splitter

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 5.6. Frequency Splitter DT1 and PT1 Filter should act as frequency splitter. High frequency response of the error amplifier should be directed to the HP Output. Low Frequency should go to the summing amplifier and then to the LP Output.

  • Page 30: Summing Amplifier

    _____________________________________________________________________________________________________ 5.7. Summing Amplifier The LB2001 has two external modulation inputs that are independently available for such applications as adding a modulation frequency to the output for lock-in detection or summing in a feed-forward correction signal for improving the command response of the feedback control.

  • Page 31: Remote Interface

    6. Remote Interface 6.1. Architecture The LB2001 is equipped with a USB interface. All settings and information which is of shown on the frontpanel could be reached. The following picture shows the different sections and how the remote port are placed.

  • Page 32: Serial Port Emulation

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 6.2. Serial Port Emulation When connecting the LB2001 to the PC a serial port driver will be installed. The following serial port settings must done. RS-232 Settings baud rate 9600 data bits parity...

  • Page 33: Lb2001 Terminal

    Param11 = Center voltage low byte Param12 = low/high pass Polarity Param13 = Lockstatus & Preatt. 6.4. LB2001 Terminal For easy use, the LB2001 is supplied with a terminal software shows a screen shot of the terminal software. Sacher Lasertechnik, LLC Tel.: 1-714-670-7605 Adress: Tel.:...

  • Page 34: Specifications

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 7. Specifications 7.1. Performance Specifications Parameter Min Typ Unit Condition Input section: Difference amplifier Input impedance (A, -B) kOhm Input Voltage noise density Common mode rejection ratio Input Offset voltage Error monitor output impedance...

  • Page 35: Environmental Specifications

    Sacher Lasertechnik GmbH Operation Manual LB2001 _____________________________________________________________________________________________________ 7.2. Environmental Specifications Parameter Unit Condition Operating temperature ° C Transportation/ staorage temperature ° C Maximum relative humidity Maximum operating altitude 2000 Instrument weight Electrical Specifications 7.3. Parameter Classification Use type Indoor use Only...

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