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Scitec 441 User Manual

Dual phase lock-in amplifier and dual phase lock-in amplifier
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Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com
North Street, Redruth
Cornwall TR15 1HR
MODEL 441 ANALOG OEM
DUAL PHASE LOCK-IN AMPLIFIER
MODEL 430 ANALOG OEM
SINGLE PHASE LOCK-IN AMPLIFIER
Boston Electronics Corporation, 91 Boylston Street, Brookline MA 02445
(800)347-5445 or (617)566-3821 * fax (617)731-0935 * boselec@boselec.com * www.boselec.com
Fax: +44 (0)1209 314 609 www.scitec.uk.com
Fax2: +44 (0)870 1600 860
&
USER MANUAL V1.2

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  • Page 1 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 MODEL 441 ANALOG OEM DUAL PHASE LOCK-IN AMPLIFIER & MODEL 430 ANALOG OEM SINGLE PHASE LOCK-IN AMPLIFIER USER MANUAL V1.2...

  • Page 2: Table Of Contents

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 CONTENTS 1 POWER SUPPLY 1.1 Power Connections 1.2 Earth Connections for High Voltage / ESD Protection...

  • Page 3: Power Supply

    A well regulated ±15V & +5V supply is required to power the lock-in amplifier board. 50mA per supply is required for the 441 and 35mA per supply are required for the 430. Power is supplied via a 64 pin type C DIN41612 connector as follows: Pin 32A &...

  • Page 4: Board Layout

    Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Figure 2 Case Earth Connections BOARD LAYOUT The 441 board layout is shown in Figure 3. Figure 3 441 Board Layout Input mode selection jumpers Input gain select jumpers Channel X output gain select and time constant jumpers...
  • Page 5 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 The 430 board layout is shown in Figure 4. Figure 4 430 Board Layout...

  • Page 6: Operation

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 OPERATION Block Diagrams Figure 5 441 Block Diagram Figure 6 430 Block Diagram Lock-in Amplifier Theory For lock-in amplifier theory please visit a number of pages on the Internet produced by M.
  • Page 7 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 http://fp.physik.uni-konstanz.de/LockIn/indexx.shtml and includes theory, diagrams and a virtual Java lock-in amplifier. Boston Electronics Corporation, 91 Boylston Street, Brookline MA 02445...

  • Page 8: Input Stage

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 INPUT STAGE The input stage amplifies the input signal to a level suitable for the demodulator section.

  • Page 9: Single Ended Dc Coupled Input

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Single Ended DC Coupled Input The default setting is for a single ended DC coupled input. This mode gives the best noise performance.

  • Page 10: Single Ended Current Input

    The input stage can also be used as a current input due to the high impedance of the input stage opamps. The current input is converted to a voltage by the 6.8MΩ resistor which has a tolerance of 1%. This mode of operation has not been fully characterised by Scitec Instruments and is not guaranteed.

  • Page 11: Differential Input

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Figure 12 Single Ended Current Input Settings Figure 13 Single Ended Current Input Circuit...

  • Page 12: Low Impedance Differential Input

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Figure 14 Differential DC Coupled Input Settings Figure 15 Differential DC Coupled Input Circuit...

  • Page 13: First Stage Amplification

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 FIRST STAGE AMPLIFICATION A simplified diagram of the input stage amplification is shown in Figure 18. Each stage can have its gain controlled through the use of jumpers in jump block L2.
  • Page 14 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Stage 1 and Stage 3 provide amplification at the input while Stage 2 provides attenuation. The...
  • Page 15 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 x 0.01 x 0.01006 x 0.0333 x 0.03346 x 0.1 x 0.0996 x 0.333 x 0.3311...

  • Page 16: Low Pass Filter Time Constant Settings

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 LOW PASS FILTER TIME CONSTANT SETTINGS The circuit diagram for the time constant section is shown in Figure 20. It consists of a first order RC low pass filter network with a number of jumper selectable resistor or capacitor values.
  • Page 17 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 300mS 10mS 30mS 100mS Boston Electronics Corporation, 91 Boylston Street, Brookline MA 02445 (800)347-5445 or (617)566-3821 * fax (617)731-0935 * boselec@boselec.com * www.boselec.com...

  • Page 18: Second Time Constant Settings

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Second Time Constant Settings A second low pass filter stage can be added to the output by mounting capacitor C13 (C14 Y channel).

  • Page 19: Output Stage

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 OUTPUT STAGE Output Stage Amplification The circuit diagram for the X channel output stage is shown in Figure 20. The Y channel is identical.

  • Page 20: R Calculation

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 R Calculation The X and Y outputs are combined together by the R calculation circuitry to produce the modulus of the input signal where R is defined as follows: R = √(X...

  • Page 21: Coarse Phase Control And 1F/2F Operation

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 (default) Figure 21 Enable Fine Phase Control To disable the fine phase control circuit and to slightly improve the reference section stability a jumper needs to be placed between pins 24 and 26 of jumper block L5 as shown in Figure 22.
  • Page 22 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Channel X, 2F operation, 180° phase shift Channel X, 2F operation, 270° phase shift Channel Y, 1F operation, 0°...

  • Page 23: Overall System Gain And Dynamic Reserve

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 OVERALL SYSTEM GAIN AND DYNAMIC RESERVE To get the best performance out of the lock-in amplifier card, it is important that the gain settings at the input and at the output are correctly balanced to give optimum performance.

  • Page 24: Dynamic Reserve

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Dynamic Reserve The dynamic reserve of the system is defined as the ratio of the noise to signal that is allowed within the system before saturation occurs, specified in dBs.

  • Page 25: Maximum Signal Size From Low Pass Filter To Output

    Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Maximum Signal Size From Low Pass Filter to Output Once the demodulated signal has passed through the low pass filter, the noise on the signal will be reduced.
  • Page 26 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Input Signal Level Input Noise Input Noise Maximum Actual Input Output Gain Total System...
  • Page 27 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Input Signal Level Input Noise Input Noise Maximum Actual Input Output Gain Total System...
  • Page 28 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Input Signal Level Input Noise Input Noise Maximum Actual Input Output Gain Total System...
  • Page 29 Bartles Industrial Estate Tel: +44 (0)1209 314 608 scitec@scitec.uk.com North Street, Redruth Fax: +44 (0)1209 314 609 www.scitec.uk.com Cornwall TR15 1HR Fax2: +44 (0)870 1600 860 Input Signal Level Input Noise Input Noise Maximum Actual Input Output Gain Total System...

This manual is also suitable for:

430

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