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Scitec 420 User Manual

Analog dual phase lock-in amplifier
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Bartles Industrial Estate, North Street, Redruth, Cornwall TR15 1HR
Tel. (01209) 314608
Fax. (01209) 314609
MODEL 420 ANALOG DUAL 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
E-mail: scitec@scitec.uk.com
Web: http://www.scitec.uk.com

USER MANUAL

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  • Page 1: User Manual

    Bartles Industrial Estate, North Street, Redruth, Cornwall TR15 1HR Tel. (01209) 314608 E-mail: scitec@scitec.uk.com Fax. (01209) 314609 Web: http://www.scitec.uk.com MODEL 420 ANALOG DUAL PHASE LOCK-IN AMPLIFIER USER MANUAL 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 2: Table Of Contents

    5.1 1F/2F Reference Select Switch 5.2 Coarse Phase Control 5.3 Fine Phase Control 6 DEMODULATOR / OUTPUT SECTION 7 USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE QUICK MEASUREMENTS 8 USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE ACCURATE MEASUREMENTS...

  • Page 3: Power Supply

    The unit is fitted with a 1Amp anti-surge (T) 5x20mm fuse, incorporated into the power connector on the rear of the unit. 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 4 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 5: Operation

    The numbers in brackets refer to the numbers used in Figure 18 at the back of this manual. 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 6: Input Stage

    (4) Replace lid and the 10 screws. 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 7: Jumper Settings Overview

    A diagram of the position of the input stage jumpers is shown in Figure 2. Figure 2 Input Stage Jumper Positions 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 8: Single Ended Dc Coupled Input (Default Setting)

    When measuring the input noise of their instruments, it is standard practice to short the input which has the nice result of removing the thermal noise of 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 9: Single Ended Current Input

    The input impedance of the lock-in in this mode is 6.8x10 The jumper settings for this mode is given in Figure 7. The equivalent circuit is shown in Figure 8. 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 10: Differential Input

    (or fall) until the levels specified in section 3.3 are breached. The input signal will then be distorted as it travels through the input stage and you will get an erroneous result. 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 11: Low Impedance Differential Input

    Figure 11 and the equivalent circuit is shown in Figure 12. The other modes are similar. Figure 11 Low Impedance Differential DC Coupled Input Settings 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 12 Bartles Industrial Estate, North Street, Redruth, Cornwall TR15 1HR Tel. (01209) 314608 E-mail: scitec@scitec.uk.com Fax. (01209) 314609 Web: http://www.scitec.uk.com Figure 12 Low Impedance Differential DC Coupled Input Circuit 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 13: Signal Ground, Case Ground And Earth

    The signal ground and hence the ground connection for the reference BNC and output BNC can be connected directly to the case ground and electrical earth by placing the jumper as shown in Figure 14. 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 14: Signal Ground Connected To Case And Electrical Earth Via 100Ω Resistor

    50V when in this mode of operation. 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 15: Reference Section

    This produces the out of phase or Y signal. These two resultant The numbers in brackets refer to the numbers used in Figure 18 - 420 Front Panel Layout at the back of this manual.
  • Page 16 -3 to +3, is useful when using the input gain sensitivity to calculate the amplitude of the input signal. 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 17: Using The 420 As A Single Phase Instrument To Take Quick Measurements

    Web: http://www.scitec.uk.com USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE QUICK MEASUREMENTS This series of instructions uses the 420 as a single phase lock-in amplifier and just uses the X channel. (1) Connect up the lock-in amplifier. (2) Switch the offset control (6) to off.

  • Page 18: Using The 420 As A Single Phase Instrument To Take Accurate Measurements

    USING THE 420 AS A SINGLE PHASE INSTRUMENT TO TAKE ACCURATE MEASUREMENTS This series of instructions uses the 420 as a single phase lock-in amplifier and just uses the X channel. This method uses the fact that when the instrument is correctly set up, adjusting the phase by ±90°...
  • Page 19 0.85V Reading can now be made 180° 20° 0.05V -0.85V Reading at 180° should be the negative of the positive reading 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 20: Using The 420 As A Dual Phase Instrument To Take Accurate Measurements

    E-mail: scitec@scitec.uk.com Fax. (01209) 314609 Web: http://www.scitec.uk.com USING THE 420 AS A DUAL PHASE INSTRUMENT TO TAKE ACCURATE MEASUREMENTS This method uses the fact that the R channel output from the instrument is insensitive to the phase relationship between the input signal and the reference signal.
  • Page 21 R output signal as an error. The solution is to ensure that the X and Y channels are smoothed before the calculations are made by using a large time constant value. 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 22: How To Make Amplitude And Phase Measurements Using An Oscilloscope

    (2) Set both the reference phase shift controls (9)(10) to zero. (3) Connect the X output from the back of the 420 lock-in to the X channel of the oscilloscope. (4) Connect the Y output from the back of the 420 lock-in to the Y channel of the oscilloscope.

  • Page 23: Front Panel Layout

    Note: This dial only comes into operation when the output (10) Fine Phase Control (16) Power On/Off Switch offset switch is set to on. (11) 1F/2F Reference Select 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...

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