SRS Labs Musical Instrument Amplifier Voltage Pre-amplifier User's Manual
Contents
1. Frequancy Hz OPERATING INSTRUCTIONS The SR550 Voltage Pre Amplifier is designed to be used with either the SR510 530 lock ins as well as the newer DSP lock ins The SR550 reduces the input noise and extends the full scale sensitivity to 10 nV without expand When used as a remote pre amplifier the SR550 can eliminate the effects of noise pickup on long signal cables Power and control are supplied to the SR550 via the 9 pin cable which is supplied with the unit Attach one end of the cable to the connector on the rear of the SR550 With the lock in power off connect the other end of the cable to the PRE AMP connector on the rear of lock in Both ends of the cable are equivalent If a longer cable is required any standard 9 pin cable will suffice since all connections are straight through When the lock in power is on the POWER indicator on the SR550 will light CONNECTING THE SR550 The A Output of the SR550 should be connected to the A Input of the lock in For most applications this single connection will be adequate The lock in Input Selector should be set to A For situations where there may be noise pick up on this cable it is better to connect the SR550 B Output shielded pre amp ground to the B Input of the lock in as well The A and B cables should be twisted together to prevent inductive pick up The lock in Input Selector should then be set to A B The SR550 A and B Inputs should now be2. Thru hole Pkg U4 3 00106 340 171007 Integrated Circuit Thru hole Pkg U5 3 00076 340 DG211 Integrated Circuit Thru hole Pkg U6 3 00106 340 LT1007 Integrated Circuit Thru hole Pkg U7 3 00038 340 74HC139 Integrated Circuit Thru hole Pkg Z0 0 00025 005 3 8 Lugs 20 0 00043 011 4 40 KEP Nut Kep 20 0 00079 031 4 40X3 16 M F Standoff Z0 0 00122 053 2 1 4 24 Wire 24 UL1007 Strip 1 4x1 4 Tin 20 0 00140 009 SHEET Mylar Sheet Z0 0 00149 020 4 40X1 4PF Screw Flathead Phillips 20 0 00188 000 SR550FOOT Hardware Misc Z0 1 00003 120 BNC Connector BNC 20 1 00041 170 DB9 DB9 MM Cable Assembly Multiconductor 20 1 00073 120 INSL Connector BNC 20 7 00097 720 SR550 2 Fabricated Part 20 7 00098 720 SR550 3 Fabricated Part PC Layout mssssans d 23 JAHcis TELLI MODEL SR552 Voltage Pre amplifier manual Stanford Research Systems SR552 Preamplifier Specifications Summary Input Impedance Inputs Maximum Inputs Noise Common Mode Gain Gain Accuracy Gain Stability Outputs Maximum Output Power Mechanical Warranty 100 25 pF Single ended or differential switch selectable 70 mV rms for overload Damage threshold 20 Vac 50 Vdc 1 4 nV NHz at 1000 Hz 1 6 nV NHz at 100 Hz 2 5 nV VHz at 10 Hz all figures are Typical Range 1 Volt peak Rejection 100 dB at 100 Hz 10 20 50 100 SR510 530 Automatically set by SR510 or SR530 Lock In depending on sensitivity and
3. 1 0K 2 32K 2 32K 301 100 3 01K 499 6 2K 10 100K 100K 750 750 2 00K 3 83K 470 DESCRIPTION Capacitor Electrolytic 50V 20 Rad Capacitor Electrolytic 16V 20 Rad Capacitor Electrolytic 16V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Electrolytic 50V 20 Rad Capacitor Electrolytic 50V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Electrolytic 35V 20 Rad Capacitor Electrolytic 35V 20 Rad Cap Mini Electrolytic 50V 20 Radial Capacitor Ceramic Disc 50V 10 SL Capacitor Ceramic Disc 50V 10 SL LED T1 Package LED T1 Package Connector D Sub Right Angle PC Female Pot Multi Turn Side Adjust Pot Multi Turn Trim 3 8 Square Top Ad Printed Circuit Board Transistor TO 78 Package Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50
4. Circuit Board Transistor TO 71 Package Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 1 50PPM Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 1 50PPM Metal Film 1 8W 1 50PPM Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Carbon Film 1 4W 5 Metal Film 1 8W 1 50PPM Carbon Film 1 4W 5 Carbon Comp 1 2W 5 Metal Film 1 8W 1 50PPM Metal Film 1 8W 1 50PPM Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 0 1 25ppm Metal Film 1 8W 1 50PPM Metal Film 1 8W 1 50PPM Carbon Film 1 4W 5 R33 4 00102 401 75K Resistor Carbon Film 1 4W 5 SW1 2 00022 217 DPDT Switch On None On Toggle Right Angle U 1 3 00124 325 79L15 Transistor TO 92 Package U2 3 00118 325 78115 Transistor TO 92 Package U3 3 00193 340 LM339 Integrated Circuit
5. dynamic reserve Sensitivity ranges from 10 nV to 200 mV full scale with expand off Note Lock in readings must be divided by 10 DSP Lock Ins Gain is set to 100 Divide lock in recordings by 100 for correct amplitude 296 2 Hz to 100 kHz 200 ppm C A single ended 6000 impedance B shielded ground 10 Volts peak Supplied by SRS Lock In via control cable Sze 1 3 X3 0 X5 1 Weight 1 Ib One year parts and labor on materials and workmanship Noise Figure Contour 100 k0 Source Resistance 10 Hz 100 Hz 1 kHz 1O0kHz 100 KHz Frequency Noise nW Hz du 10K 100K Frequency Hz OPERATING INSTRUCTIONS The SR552 Voltage Pre Amplifier is designed to be used with either the SR510 530 lock ins as well as the newer DSP lock ins The SR552 reduces the input noise and extends the full scale sensitivity to 10 nV without expand When used as a remote pre amplifier the SR552 can eliminate the effects of noise pickup on long signal cables Power and control are supplied to the SR552 via the 9 pin cable which is supplied with the unit Attach one end of the cable to the connector on the rear of the SR552 With the lock in power off connect the other end of the cable to the PRE AMP connector on the rear of lock in Both ends of the cable are equivalent If a longer cable is required any standard 9 pin cable will suffice since all connections are straight through When the lock in
6. power is on the POWER indicator on the SR552 will light CONNECTING THE SR552 The A Output of the SR552 should be connected to the A Input of the lock in For most applications this single connection will be adequate The lock in Input Selector should be set to A For situations where there may be noise pick up on this cable it is better to connect the SR552 B Output shielded pre amp ground to the B Input of the lock in as well The A and B cables should be twisted together to prevent inductive pick up The lock in Input Selector should then be set to A B MODEL 58552 A BIPOLAR PREAMP 1 V fi ED Kx READING by M STANFORD RESEARCH SYSTEMS INC The SR552 A and B Inputs should now be used as the lock in voltage inputs The input switch selects single ended A or differential A B operation The input impedance is 100 kQ 25 pF The connector shields are isolated from the chassis ground by 10 Ohms These inputs are protected to 100 Vdc but the ac input should never exceed 10 V peak The maximum input before overload is 70 mVrms The OVERLOAD indicator will light whenever the pre amplifier overloads Note that overloads that occur after the pre amplifier are indicated by the lock in s overload indicator USING THE SR550 WITH THE SR510 530 The SR510 530 lock ins sense the presence of the SR552 through the power cable and takes it into account when setting the gain o
7. to 1 PARTS LIST REF C1 C2 C3 C4 C5 C6 C7 C8 C9 C 10 C 11 DS1 R21 R22 R23 R24 R25 R 26 R27 R28 R 29 R 30 R 31 R 32 SRS part 5 00040 509 5 00030 520 5 00030 520 5 00100 517 5 00100 517 5 00100 517 5 00035 521 5 00035 521 5 00100 517 5 00056 512 5 00056 512 3 0001 1 303 3 00010 303 1 00014 160 4 00304 445 4 00011 441 7 00099 701 3 00545 323 4 00093 401 4 00047 401 4 00047 401 4 00027 401 4 00027 401 4 01609 408 4 01609 408 4 00141 407 4 00052 401 4 00052 401 4 00061 401 4 00102 401 4 00061 401 4 00081 401 4 01608 408 4 01608 408 4 00180 407 4 00141 407 4 00032 401 4 00032 401 4 00080 401 4 00080 401 4 00193 407 4 00305 401 4 00107 402 4 00306 407 4 00306 407 4 00217 408 4 00217 408 4 00159 407 4 00130 407 4 00095 401 100K 100K 47 47 499 4 3K 10 100M 100M 1 000K 1 000K 2 10K 1 00K 620 DESCRIPTION Capacitor Electrolytic 50V 20 Rad Capacitor Electrolytic 16V 20 Rad Capacitor Electrolytic 16V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Tantalum 35V 20 Rad Capacitor Electrolytic 25V 20 Rad Capacitor Electrolytic 25V 20 Rad Capacitor Tantalum 35V 20 Rad Cap Stacked Metal Film 50V 5 40 85c Cap Stacked Metal Film 50V 5 40 85c LED T1 Package LED T1 Package Connector D Sub Right Angle PC Female Pot Multi Turn Side Adjust Pot Multi Turn Trim 3 8 Square Top Ad Printed
8. 2 RESEARCH RE A B IM 1987 Q
9. MODEL SR550 552 Voltage Pre amplifier RS stanford Research Systems 1290 D Reamwood Avenue Sunnyvale CA 94089 U S A Phone 408 744 9040 Fax 408 744 9049 Email info thinkSRS com www thinkSRS com Copyright 1999 2001 Stanford Research Systems Inc All Rights Reserved Rev 2 6 08 2001 MODEL SR550 Voltage Pre amplifier manual Stanford Research Systems SR550 Preamplifier Specifications Summary Input Impedance Inputs Maximum Inputs Noise Common Mode Gain Gain Accuracy Gain Stability Outputs Maximum Output Power Mechanical Warranty Nope nv Hz 100 25 pF Single ended or differential switch selectable 250 mV RMS for overload 100 Vdc 10 Vac damage threshold 3 6 nV VHz at 1000 Hz 4 0 nV VHz at 100 Hz 13 nV NHzat 10 Hz all figures are Typical Range 1 Volt peak Rejection 90 dB at 100 Hz 1 2 5 10 SR510 530 Automatically set by SR510 or SR530 Lock in depending on full scale sensitivity and dynamic reserve Sensitivity ranges from 10 nV to 200 mV full scale expand off DSP Lock Ins Gain is set to 10 Divide Lock In reading by 10 for correct amplitude 296 2 Hz to 100 kHz 100 ppm C A single ended 6000 impedance B shielded ground 7 Volts peak to peak Supplied by SRS Lock in via connector cable 1 3 X 3 0 X 5 1 weight 1 Ib One year parts and labor on materials and workmanship 18 Ju Tad 33d 1L 10H IRK
10. PPM Resistor Carbon Film 1 4W 5 Resistor Carbon Comp 1 2W 5 Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Metal Film 1 8W 1 50PPM Resistor Carbon Film 1 4W 5 4 00082 401 4 00032 401 4 00032 401 2 00025 217 3 00124 325 3 00118 325 3 00193 340 8 00085 860 3 00076 340 3 00038 340 0 00025 005 0 00043 011 0 00079 031 0 00122 053 0 00140 009 0 00149 020 0 00188 000 1 00003 120 1 00041 170 1 00073 120 7 00098 720 7 00128 720 470K 100K 100K SPDT 79L15 78L15 LM339 SR513 ASSY DG211 74HC139 3 8 4 40 KEP 4 40X3 16 M F 2 1 4 24 SHEET 4 40X1 4PF SR552FOOT BNC DB9 DB9 MM INSL SR552 3 SR552 2 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Resistor Carbon Film 1 4W 5 Switch On None On Toggle Right Angle Transistor TO 92 Package Transistor TO 92 Package Integrated Circuit Thru hole Pkg SRS sub assemblies Integrated Circuit Thru hole Pkg Integrated Circuit Thru hole Pkg Lugs Nut Kep Standoff Wire 24 UL1007 Strip 1 4x1 4 Tin Mylar Sheet Screw Flathead Phillips Hardware Misc Connector BNC Cable Assembly Multiconductor Connector BNC Fabricated Part Fabricated Part PC Layout j m p a An SYSTEMS m 2 MADE IN USA P1 GREEM uz C ke 830 STANFORD 5855
11. SR552 without a lock in The SR552 can be powered with an external power supply Power is applied through the 9 pin connector as described below Pin Voltage Current 1 20 V 100 mA 2 5V 10 mA 6 20 V 100 mA 7 8 Ground All three voltages are required Pins 7 and 8 should be tied together All other pins should be left open The gain will be 100 in this configuration Grounding pin 3 will change the gain to 50 and grounding pin 4 will change the gain to 20 Grounding both pins 3 and 4 will change the gain to 10 PARTS LIST REF C1 C2 C3 C4 C5 C6 R 21 R 23 R 24 R 25 R 26 R 27 R 28 R 29 R 30 R31 R 32 SRS part 5 00040 509 5 00030 520 5 00030 520 5 00100 517 5 00100 517 5 00100 517 5 00044 509 5 00044 509 5 00100 517 5 00034 526 5 00034 526 5 00192 542 5 00008 501 5 00008 501 3 00011 303 3 00010 303 1 00014 160 4 00354 445 4 00353 441 7 00127 701 3 00231 328 4 00093 401 4 00047 401 4 00047 401 4 00356 407 4 00356 407 4 00141 407 4 00052 401 4 00052 401 4 00061 401 4 00082 401 4 00061 401 4 00021 401 4 00351 407 4 00351 407 4 00180 407 4 00141 407 4 00176 407 4 00193 407 4 00093 401 4 00107 402 4 00142 407 4 00142 407 4 00204 407 4 00204 407 4 00158 407 4 00178 407 4 00081 401 VALUE 1 00 22000 22000 2 20 2 20 2 20 470 470 2 20 1000 1000 220 MIN 22 22 RED GREEN 9 PIND 20 100 SR552 MAT02 EH 6 2K 2 2 2 2 20 20 100 20 20 240K 470K 240K
12. SRS DSP LOCK INS The SR552 is not sensed by the DSP lock ins The DSP lock in does NOT compensate for the gain of the preamp The gain of the preamp is set to 10 Measurements made with the preamp need to be divided by 100 The SR552 is AC coupled from 1 Hz to 100 kHz Set the lock in input to AC coupled since the signal must be above 1 Hz Frequencies below 1 Hz will not be detected by the SR552 COMMON MODE ADJUST The common mode rejection of the SR552 is adjusted by the small screw on the right side of the enclosure The CMR is set at the factory however it may be necessary to re adjust it particularly if there is one specific frequency which is important The easiest way to peak the CMR is to use the internal oscillator of the lock in or any signal generator Apply a reference signal to the lock in REFERENCE INPUT Apply a 100 mV signal to both the A and B inputs of the SR552 Check the SR552 connections by switching the input selector to A The lock in should read 100 mV with the phase adjusted on the SR510 Now switch the SR552 to A B Adjust the lock in sensitivity to obtain a 5096 output Adjust the CMR screw on the SR552 to minimize the lock in output On the SR510 it is necessary to check the output when 90 of phase shift is added as well On a Typical Common Mode Rejection Ratio Vs Frequency CD KG tr EE o iK Frequency Hz dual phase lock in use the R output to avoid phase shifts The
13. e 10 The following table summarizes the gain allocation Leck ze OUTPUTS iM LIS SR550 Pre Amplifier Front Panel and Rear Panel DYNRES EFS Sensitivity SR550 Gain LOW gt 50 mV 1 20 db 50 mV 2 20 mV 5 lt 20 mV 10 NORM 5mV 1 40 db 5 mV 2 2mV 5 lt 2 mV 10 HIGH gt 500 uV 1 60 db 500 uV 2 200 uV 5 lt 200 uV 10 When the SR550 is connected the full scale sensitivity can extend to 10 nV no expand The 10 20 50 nV sensitivities can be reached using the normal lock in controls If the SR550 is disconnected while the sensitivity is below 100 nV the sensitivity will revert back to 100 nV From the computer interface the presence of the SR550 can be determined using the H command Also gain codes 1 3 are acceptable in the G command to set sensitivities below 100 nV Pre amplifier overloads are not detectable via the computer interface USING THE SR550 WITH SRS DSP LOCK INS The SR550 is not sensed by the DSP lock ins The DSP lock in does NOT compensate for the gain of the preamp The gain of the preamp is set to 10 Measurements made with the preamp need to be divided by 10 The SR550 is AC coupled from 1 Hz to 100 kHz Set the lock in input to AC coupled since the signal must be above 1 Hz Frequencies below 1 Hz will not be detected by the SR550 COMMON MODE ADJUST The common mode rejection of the SR550 is adjusted by the small screw on the right side of the enclosure The CMR i
14. f its own amplifiers Thus to obtain the correct overall gain the SR552 output must be connected to the voltage inputs of the lock in The overall sensitivity of the lock in plus the pre amplifier is displayed as the sensitivity on the lock in front panel It is necessary to divide the displayed sensitivity by 10 The gain of the SR552 is 10 20 50 or 100 The gain is controlled by the lock in and is set to maximize the pre amplifier gain while maintaining the selected dynamic reserve For most sensitivities the pre amplifier gain will be 100 The following table summarizes the gain allocation A B Leck in OUTPUTS ALADE IN USA SR552 Pre Amplifier Front Panel and Rear Panel DYN RES LOW 20 db NORM 40 db HIGH 60 db FS Sensitivity SR552 Gain 50mV 50 mV 20 mV lt 20 mV 5mV 5mV 2mV amv gt 500 uV 500 pV 200 uV lt 200 uV When the SR552 is connected the full scale sensitivity can extend to 10 nV no expand The 10 20 50 nV sensitivities can be reached using the normal lock in controls If the SR552 is disconnected while the sensitivity is below 100 nV the sensitivity will revert back to 100 nV From the computer interface the presence of the SR552 can be determined using the H command Also gain codes 1 3 are acceptable in the G command to set sensitivities below 100 nV Pre amplifier overloads are not detectable via the computer interface USING THE SR552 WITH
15. s set at the factory however it may be necessary to re adjust it particularly if there is one specific frequency which is important The easiest way to peak the CMR is to use the internal oscillator of the lock in or any signal generator Apply a reference signal to the lock in REFERENCE INPUT Apply a 100 mV signal to both the A and B inputs of the SR550 Check the SR550 connections by switching the input selector to A The lock in should read 100 mV with the phase adjusted on the SR510 Now switch the SR550 to A B Adjust the lock in sensitivity to obtain a 50 output Adjust the CMR screw on the SR550 to minimize the lock in output On the SR510 it is necessary to check the output when 90 of phase shift is added as well On a dual phase lock in use the R output to avoid phase shifts Typical Common Mode Rejection Ratio Vs Frequency 0 GG tr E o Frequency Hz THE SR550 WITHOUT A LOCK IN The SR550 can be powered with an external power supply Power is applied through the 9 pin connector as described below Pin Voltage Current 1 20 V 100 mA 2 5 10 6 20 100 7 Ground 8 Ground All three voltages are required Pins 7 and 8 should be tied together All other pins should be left open The gain will be 10 in this configuration Grounding pin 3 will change the gain to 5 and grounding pin 4 will change the gain to 2 Grounding both pins 3 and 4 will change the gain
16. used as the lock in voltage inputs The input SES Sa PRE AMPLIHER X o MEE n INPUTS 100 STANFORD RESEARCH SYSTEMS INC switch selects single ended A or differential A B operation The input impedance is 100 MQ 25 pF The connector shields are isolated from the chassis ground by 10 Ohms These inputs are protected to 100 Vdc but the ac input should never exceed 10 V peak The maximum input before overload is 350 mV peak 250 mV RMS The OVERLOAD indicator will light whenever the pre amplifier overloads Note that overloads that occur after the pre amplifier are indicated by the lock in s overload indicator USING THE SR550 WITH THE SR510 530 The SR550 552 lock ins sense the presence of the SR550 through the power cable and takes it into account when setting the gain of its own amplifiers Thus to obtain the correct overall gain the SR550 output must be connected to the voltage inputs of the lock in The overall sensitivity of the lock in plus the pre amplifier is displayed as the sensitivity on the lock in front panel It is NOT necessary to divide the displayed sensitivity by 10 When setting the sensitivity the presence of the SR550 is transparent The gain of the SR550 is 1 2 5 or 10 The gain is controlled by the lock in and is set to maximize the pre amplifier gain while maintaining the selected dynamic reserve For most sensitivities the pre amplifier gain will b
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