Stanford Research Systems SR560 Manual
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Stanford Research Systems SR560 Manual

Low-noise preamplifier
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MODEL SR560
LOW-NOISE PREAMPLIFIER
1290-D Reamwood Avenue
Sunnyvale, CA 94089 U.S.A.
(408) 744-9040
Copyright © 1989, 1990, 1997, 1999
Stanford Research Systems
All Rights Reserved.
Revision 2.6
(02/2003)

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  • Page 1 MODEL SR560 LOW-NOISE PREAMPLIFIER 1290-D Reamwood Avenue Sunnyvale, CA 94089 U.S.A. (408) 744-9040 Copyright © 1989, 1990, 1997, 1999 Stanford Research Systems All Rights Reserved. Revision 2.6 (02/2003)

  • Page 3: Table Of Contents

    Ventilation Power-Up Repackaging for Shipment Use in Biomedical Applications Warning Regarding Use with Photomultipliers Accessories Furnished Environmental Conditions Symbols Specifications SR560 Low Noise Preamplifier Specifications Chart Operation and Controls Front Panel Operating Summary Power Source Filters Gain Mode Gain Output...
  • Page 4 Johnson Noise '1/f' Noise Others Non-Essential Noise Sources Capacitive Coupling Inductive Coupling Resistive Coupling ('Ground Loops') Microphonics Thermocouple Effect SR560 - Component List Front Panel Board Main Board Miscellaneous Parts C-13 PCB - SR560 Revision F (9/89) Schematics E-1 to E-10...

  • Page 5: Introduction And Setup

    The SR560 front-panel pushbutton or through an RS- normally operates with a fully floating 232 command.

  • Page 6: Preparation For Use

    AC power is connected. Always ensure adequate ventilation when operating the SR560. The unit will generate The SR560 can operate from a 100 V, 120 heat while charging dead batteries. V, 220 V or 240 V nominal AC power source having a line frequency of 50 or 60 Hz.

  • Page 7: Repackaging For Shipment

    Repackaging for Shipment Relative Humidity: <90% Non-condensing The original packing materials should be NON-OPERATING saved for reshipment of the SR560. If the Temperature: -25°C to +65°C original packing materials are not available, Relative Humidity: <95% Non-condensing wrap the instrument in polyethylene...

  • Page 9: Specifications

    SPECIFICATIONS SR560 LOW-NOISE PREAMPLIFIER SPECIFICATIONS CHART Inputs Single-ended or true differential Impedance 100 MΩ + 25 pF, DC-coupled Maximum Inputs 1 VDC before overload; 3 V peak to peak max AC coupled; protected to 100 VDC Maximum Output 10 Vpp Noise <4 nV/√Hz at 1 kHz...
  • Page 10 SPECIFICATIONS...

  • Page 11: Operation And Controls

    "CHARGE" and "MAINTAIN" LED indicators. Power Source The SR560 is turned on by depressing the POWER switch. When disconnected from AC power, the unit will operate for There are two input connectors located in approximately 20 hours on internal sealed the SOURCE section of the front panel.

  • Page 12: Filters

    GROUND" banana jacks on the rear panel six ways: of the SR560. When connected to AC power, the chassis of the unit is always i. high-pass filter at +12 dB / octave connected to the grounding conductor of the ii.

  • Page 13: Gain Mode

    UNCAL the instrument's key-repeat BLANKING input (on the rear panel of the rate will start slowly and increase to a limit SR560) is active. The SR560 responds to a as long as either Gain button is depressed. blanking input by internally grounding the...

  • Page 14: Rear Panel Operating Summary

    OPERATION AND CONTROLS Figure 3: SR560 Rear Panel REAR PANEL OPERATING SUMMARY The SR560 rear panel is pictured in Figure ground is connected to the AC line ground 3. Various interface and power connectors conductor. are provided, along with fuses and charger status LEDs.

  • Page 15: Blanking Input

    "maintain" charge condition indefinitely, and will suffer no degradation from prolonged RS-232 Interface charging. The sealed lead-acid batteries used in the SR560 differ in this respect from The RS-232 interface connector allows nickel-cadmium batteries, which do suffer listen-only communication with the SR560 shortened lifetimes due to overcharging.
  • Page 16 • AVOID DEEP DISCHARGE • KEEP THE BATTERIES COOL Recharge the batteries after each use. The When not in use, the SR560 should be two-step fast-charge / trickle-charge stored in a cool, dry place with the batteries operation of the SR560 allows the charger fully charged.

  • Page 17: Circuit Description

    K103 and K104 allow the inputs A and B to be individually grounded, while K101 selects AC or DC coupling. Inversion of the inputs The two filter stages in the SR560 each is provided by relay K105. The input consist of 16 R-C filters which can be...

  • Page 18: Overload Detection

    RS-232 port. the non-inverting input of U402. The front panel offset control also sums at this The SR560 uses a 16 K x 8 CMOS junction, and provides an offset voltage of EPROM, (U504) containing system ±5 V that is buffered by U407D.

  • Page 19: Power Regulators

    Two optically isolated rear panel interfaces battery indication to prevent oscillation are provided on the SR560. The blanking around the trip point. The "dead" level is input accepts a TTL-level signal and 10.7 volts and is used to disconnect the...

  • Page 20: Batteries And P.e.m

    CIRCUIT DESCRIPTION BATTERIES AND P.E.M. FRONT PANEL The batteries used in the SR560 are of The front panel contains the keypad sealed lead-acid construction. There are pushbuttons, LED indicators and serial shift three 12 V, 1.9 amp-hour batteries, two of registers.

  • Page 21: Calibration And Repair

    OFFSET ADJUSTMENT Apply 1 kHz 1 Vpp sine to both the A and B inputs. The SR560's front-panel offset adjustment • Couple = DC, source = A - B: adjust provides an easy way for the user to null the P102 to null sine wave output.

  • Page 22: Battery Replacement

    CALIBRATION AND REPAIR BATTERY REPLACEMENT noise is dominated by the amplifier's own noise, which is much larger than the thermal noise of the source. After three to five years or about 1000 charge/discharge cycles, the sealed lead- acid batteries degrade. When the battery operation time shortens, or if the unit stays very warm for more than a day after it is plugged into the line, the batteries may...

  • Page 23: Input Voltage Noise

    The figure below shows the dynamic reserve (and maximum input The amplifier's input voltage noise signal without overload) for a SR560 set to approximates that of a 1000Ω resistor a gain of 1000, the high pass filter set to 1 (about 4 nV/√Hz).
  • Page 24 CALIBRATION AND REPAIR Gain Input Noise Maximum (nV/√ Hz ) DR (dB 0) Gain Input Noise Maximum (nV/√ Hz ) DR (dB 0) 2000, LN 2000, HDR 5000, LN 5000, MDR 10, LN 10, HDR 10000 20, LN 20000 20, HDR 50000 50, LN 50, HDR...

  • Page 25: Remote Programming

    3 = 6 dB high pass, Introduction 4 = 12 dB highpass, 5 = bandpass The SR560 is equipped with a standard DB- 25 RS-232C connector on the rear panel for GAIN i Sets the gain. remote control of all instrument functions.
  • Page 26 APPENDIX A A - 2...

  • Page 27: Noise Sources And Cures

    APPENDIX B for carbon, R is the resistance, I the current, NOISE SOURCES AND CURES the bandwidth of our detector, and f is the frequency to which the detector is tuned. Noise, random and uncorrelated fluctuations For a carbon resistor carrying 10 mA with of electronic signals, finds its way into R = 1 k, ∆f = f = 1 Hz, we have: experiments in a variety of ways.

  • Page 28: Capacitive Coupling

    APPENDIX B ways which these noise sources work their way into an experiment. 3) Install capacitive shielding by placing both the experiment and the detector in Capacitive Coupling a metal box. A voltage on a nearby piece of apparatus (or operator) can couple to a detector via a stray capacitance.

  • Page 29: Resistive Coupling ('Ground Loops

    APPENDIX B Resistive Coupling (or ‘Ground The capacitance of a coaxial cable is a function of its geometry so mechanical Loops’) vibrations will cause the cable capacitance to vary with time. Currents through common connections can give rise to noise voltages. Since C = Q/V, we have: C dV + V dC = dQ = i So mechanical vibrations will cause a dC/dt...
  • Page 30 APPENDIX B...

  • Page 31: Sr560 - Component List

    SR560 COMPONENT PARTS LIST Front Panel Parts List REF. SRS part# VALUE DESCRIPTION 3-00884-306 LED, Rectangular 3-00012-306 GREEN LED, Rectangular 3-00012-306 GREEN LED, Rectangular 3-00012-306 GREEN LED, Rectangular 3-00012-306 GREEN LED, Rectangular 3-00012-306 GREEN LED, Rectangular 3-00012-306 GREEN LED, Rectangular...

  • Page 32: Main Board

    SR560 COMPONENT PARTS LIST D 48 3-00004-301 1N4148 Diode 1-00035-130 20 PIN DIL Connector, Male 4-00651-425 270X9 Resistor Network SIP 1/4W 2% (Common) 4-00651-425 270X9 Resistor Network SIP 1/4W 2% (Common) 4-00651-425 270X9 Resistor Network SIP 1/4W 2% (Common) 4-00336-425...
  • Page 33 SR560 COMPONENT PARTS LIST C 112 5-00023-529 Cap, Monolythic Ceramic, 50V, 20%, Z5U C 113 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 114 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad C 115 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad...
  • Page 34 SR560 COMPONENT PARTS LIST C 319 5-00033-520 Capacitor, Electrolytic, 16V, 20%, Rad C 320 5-00033-520 Capacitor, Electrolytic, 16V, 20%, Rad C 321 5-00031-520 220U Capacitor, Electrolytic, 16V, 20%, Rad C 322 5-00031-520 220U Capacitor, Electrolytic, 16V, 20%, Rad C 323...
  • Page 35 SR560 COMPONENT PARTS LIST C 804 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 805 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 806 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX C 807 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX...
  • Page 36 SR560 COMPONENT PARTS LIST D 705 3-00011-303 LED, T1 Package D 706 3-00062-340 KBP201G/BR-81D Integrated Circuit (Thru-hole Pkg) D 707 3-00226-301 1N5822 Diode D 708 3-00226-301 1N5822 Diode D 709 3-00306-340 LM385BZ-2.5 Integrated Circuit (Thru-hole Pkg) D 710A 3-00391-301 MBR360...
  • Page 37 SR560 COMPONENT PARTS LIST Q 703 3-00374-329 MTP20P06 Voltage Reg., TO-220 (TAB) Package Q 801 3-00376-329 MTP5N05 Voltage Reg., TO-220 (TAB) Package 4-00616-453 49.9 Resistor, 2W, 1% R 101 4-00306-407 100M Resistor, Metal Film, 1/8W, 1%, 50PPM R 102 4-00306-407...
  • Page 38 SR560 COMPONENT PARTS LIST R 212 4-00600-407 15.8K Resistor, Metal Film, 1/8W, 1%, 50PPM R 213 4-00600-407 15.8K Resistor, Metal Film, 1/8W, 1%, 50PPM R 214 4-00030-401 Resistor, Carbon Film, 1/4W, 5% R 215 4-00165-407 Resistor, Metal Film, 1/8W, 1%, 50PPM...
  • Page 39 SR560 COMPONENT PARTS LIST R 403 4-00325-407 Resistor, Metal Film, 1/8W, 1%, 50PPM R 404 4-00165-407 Resistor, Metal Film, 1/8W, 1%, 50PPM R 405 4-00030-401 Resistor, Carbon Film, 1/4W, 5% R 406 4-00030-401 Resistor, Carbon Film, 1/4W, 5% R 407...
  • Page 40 SR560 COMPONENT PARTS LIST R 707 4-00042-401 Resistor, Carbon Film, 1/4W, 5% R 708 4-00376-407 2.87K Resistor, Metal Film, 1/8W, 1%, 50PPM R 709 4-00169-407 Resistor, Metal Film, 1/8W, 1%, 50PPM R 710 4-00058-401 220K Resistor, Carbon Film, 1/4W, 5%...
  • Page 41 SR560 COMPONENT PARTS LIST U 101 3-00371-340 DG444 Integrated Circuit (Thru-hole Pkg) U 102 3-00382-340 OPA37 Integrated Circuit (Thru-hole Pkg) U 103 3-00090-340 LF411 Integrated Circuit (Thru-hole Pkg) U 104 3-00385-340 74HC4053 Integrated Circuit (Thru-hole Pkg) U 105 3-00297-340 LT1028...
  • Page 42 SR560 COMPONENT PARTS LIST U 801 3-00112-329 7805 Voltage Reg., TO-220 (TAB) Package U 802 3-00307-340 LM2940T-10 Integrated Circuit (Thru-hole Pkg) U 803 3-00090-340 LF411 Integrated Circuit (Thru-hole Pkg) U 804 3-00250-340 PS2501A-2 Integrated Circuit (Thru-hole Pkg) 0-00014-002 Power Entry Hardware...

  • Page 43: Miscellaneous Parts

    SR560 COMPONENT PARTS LIST 0-00666-050 23" #18 WHITE Wire #18 UL1007 Stripped 3/8x3/8 No Tin 0-00667-050 20" #18 WHITE Wire #18 UL1007 Stripped 3/8x3/8 No Tin 1-00124-178 4 PIN Connector Housing, Plug 1-00125-179 4 PIN Connector Housing, Receptacle 1-00126-176 .062" DIAM...
  • Page 44 SR560 COMPONENT PARTS LIST C-14...

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