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|SRS Stanford Research Systems SR850 Amplificador|
SRS Stanford Research Systems
|Categoria:||Instrumentos de medição|
|Descrição:||DSP Lock-In Amplifier|
SIGNAL CHANNEL Voltage Inputs Single-ended (A) or differential (A-B). Current Input 106 or 108 Volts/Amp. Full Scale Sensitivity 2 nV to 1 V in a 1-2-5-10 sequence (expand off). Input Impedance Voltage: 10 M½+25 pF, AC or DC coupled. Current: 1 k½ to virtual ground. Gain Accuracy ±1% from 20°C to 30°C (notch filters off). Input Noise 6 nV/ÃHz at 1 kHz (typical). Signal Filters 60 (50) Hz and 120(100) Hz notch filters (Q=4). CMRR 90 dB at 100 Hz (DC Coupled). Dynamic Reserve Greater than 100 dB (with no signal filters). Harmonic Distortion <-90 dB to 10 kHz, <-80 dB to 100 kHz. REFERENCE CHANNEL Frequency Range 1 mHz to 102 kHz Reference Input TTL (rising or falling edge) or Sine. Sine input is1 M½, AC coupled (>1 Hz). 400 mV pk-pk minimum signal. Phase Resolution 0.001° Absolute Phase Error <1° Relative Phase Error <0.001° Orthogonality 90° ± 0.001° Phase Noise External synthesized reference: 0.005° rms at 1 kHz, 100 ms, 12 dB/oct. Internal reference: crystal synthesized, <0.0001° rms at 1 kHz. Phase Drift <0.01°/°C below 10 kHz <0.1°/°C to 100 kHz Harmonic Detect Detect at Nxf where N<32767 and Nxf<102 kHz. Acquisition Time (2 cycles + 5 ms) or 40 ms, whichever is greater. DEMODULATOR Zero Stability Digital displays have no zero drift on all dynamic reserves. Analog outputs: <5 ppm/°C for all dynamic reserves. Time Constants 10 μs to 30 s (reference > 200 Hz). 6, 12, 18, 24 dB/oct rolloff. up to 30000 s (reference < 200 Hz). 6, 12, 18, 24 dB/oct rolloff. Synchronous filtering available below 200 Hz. Harmonic Rejection -90 dB INTERNAL Oscillator Frequency 1 mHz to 102 kHz. Frequency Accuracy 25 ppm + 30 μHz Frequency Resolution 5 digits or 0.1 mHz, whichever is greater. Frequency Sweeps Linear and Log. Distortion f<10 kHz, below -80 dBc. f>10 kHz, below -70 dBc.1 Vrms amplitude. Output Impedance 5 0 ½ Amplitude 4 mVrms to 5 Vrms (into a high impedance load) with 2 mV resolution. (2 mVrms to 2.5 Vrms into 50½ load). Amplitude Accuracy 1% Amplitude Stability 50 ppm/°C Outputs Sine output on front panel. TTL sync output on rear panel. When using an external reference, both outputs are phase locked to the external reference. INPUTS AND OUTPUTS Channel 1 Output X, R, q, or Trace 1-4. Traces are defined as A•B/C or A•B/C2 where A, B, and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Output Voltage: ±10 V full scale. 10 mA max output current. Channel 2 Output Y, R, q, or Trace 1-4. Traces are defined as A•B/C or A•B/C2 where A, B, and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Output Voltage: ±10 V full scale. 10 mA max output current. X and Y Outputs Rear panel outputs of cosine (X) and sine (Y) components. Output Voltage: ±10 V. 10 mA max output current. Aux. Outputs 4 BNC Digital to Analog outputs. ±10 V full scale, 1 mV resolution. May be set to a fixed voltage or swept in amplitude (linear or log). 10 mA max output current. Aux. Inputs 4 BNC Analog to Digital inputs. Differential inputs with1 M½ input impedance on both shield and center conductor. ±10 V full scale, 1 mV resolution. Trigger Input TTL trigger input triggers each data sample and/or start of scan. Monitor Output Analog output of signal amplifiers (before the demodulator). DISPLAYS Screen Format Single or dual display. Displayed Quantities Each display may show one of the traces. Traces are defined as A•B/C or A•B/C2 where A, B and C are selected from the quantities Unity, X, Y, R, q, Xnoise, Ynoise, Rnoise, Aux Inputs 1 through 4, or Frequency. Display Types Large numeric readout with bar graph, polar graph, and strip chart. Chart Data Buffer 64k data points may be stored and displayed on strip charts. The buffer can be configured as a single trace with 64k points, 2 traces with 32k points each, or 4 traces with16k points each. The internal data sample rate ranges from 512 Hz down to 1 point every 16 seconds. Samples can also be triggered. ANALYSIS FUNCTIONS Smoothing 5 - 25 point Savitsky-Golay smoothing of trace regions. Curve Fits Line, Exponential, and Gaussian fits of trace regions. Calculator Arithmetic, trigonometric, and logarithmic calculations on trace regions. Statistics Mean and standard deviation of trace regions. GENERAL Monitor Monochrome CRT. 640H by 480V resolution. Adjustable brightness and screen position. Interfaces IEEE-488, RS232 and Printer interfaces standard. All instrument functions can be controlled through the IEEE-488 and RS232 interfaces. A PC keyboard input is provided for additional flexibility. Preamp Power Power connector for SR550 and SR552 preamplifiers. Hardcopy Screen dumps to dot matrix and HP LaserJet compatible printers. Data plots to HP-GL compatible plotters (via RS232 or IEEE-488). Screens can also be saved to disk as PCX image files. Disk 3.5 inch DOS compatible format, 720 kbyte capacity. Storage of data and setups. Power 60 Watts, 100/120/220/240 VAC, 50/60 Hz. Dimensions 17"W x 6.25"H x 19.5"D Weight 40 lbs. Warranty One year parts and labor on materials and workmanship.
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|SRS Stanford Research Systems -- SR850 -- Manual do Usuário|
|Tipo manual:||Manual do Usuário|
|Tamanho:||762.20 Kbytes (780489 Bytes)|
|Data:||01 Outubro 1999|
|Qualidade:||Documento eletrônico, digitalização, bem legível.|
|Envie data:||01 Janeiro 2017|
|Downloads:||180 desde 01 Janeiro 2017|
GENERAL INFORMATION Safety and Preparation for Use 1-3 Specifications 1-5 Abridged Command List 1-7 GETTING STARTED Your First Measurements 2-1 The Basic Lock-in 2-3 Displays and Traces 2-7 Outputs, Offsets and Expands 2-13 Scans and Sweeps 2-17 Using the Disk Drive 2-23 Aux Outputs and Inputs 2-31 Trace Math 2-35 SR850 BASICS What is a Lock-in Amplifier? 3-1 What Does a Lock-in Measure? 3-3 The SR850 Functional Diagram 3-5 Reference Channel 3-7 Phase Sensitive Detectors 3-9 Time Constants and DC Gain 3-11 DC Outputs and Scaling 3-13 Dynamic Reserve 3-17 Signal Input Amplifier and Filters 3-19 Input Connections 3-21 Intrinsic (Random) Noise Sources 3-23 External Noise Sources 3-25 Noise Measurements 3-27 OPERATION FRONT PANEL 4-1 Power On/Off and Power On Tests 4-1 Video Display 4-1 Soft Keys 4-2 Keypad 4-2 Spin Knob 4-2 Disk Drive 4-2 Front Panel BNC Connectors 4-2 SCREEN DISPLAY 4-5 Default Display 4-5 Data Traces 4-6 Single/Dual Trace Displays 4-7 Bar Graphs 4-9 Polar Graphs 4-10 Strip Charts 4-11 Trace Scans, Sweeps and Aliasing 4-13 Settings and Input/Output Monitor 4-15 Menu Display 4-15 Status Indicators 4-16 KEYPAD 4-19 Normal and Alternate Keys 4-19 Menu Keys 4-19 Additional Menus 4-20 Entry Keys 4-20 START/CONT and PAUSE/RESET 4-20 CURSOR 4-21 ACTIVE DISPLAY 4-21 MARK 4-21 CURSOR MAX/MIN 4-21 AUTO RESERVE 4-22 AUTO GAIN 4-22 AUTO PHASE 4-22 AUTO SETUP 4-22 AUTOSCALE 4-22 PRINT to a Printer 4-23 PRINT to a FILE 4-23 HELP 4-23 LOCAL 4-23 REAR PANEL 4-25 Power Entry Module 4-25 IEEE-488 Connector 4-25 RS232 Connector 4-25 Parallel Printer Connector 4-25 PC Keyboard Connector 4-25 Rear Panel BNC Connectors 4-26 Aux Inputs (A/D Inputs) 4-26 Aux Outputs (D/A Outputs) 4-26 X and Y Outputs 4-26 Signal Monitor Output 4-26 Trigger Input 4-27 TTL Sync Output 4-27 Preamp Connector 4-27 USING SRS PREAMPS 4-27 MENUS Menu Guide 5-1 Default Settings 5-2 Reference and Phase Menu 5-3 Input and Filters Menu 5-7 Gain and Time Constant Menu 5-9 Output and Offset Menu 5-15 Trace and Scan Menu 5-17 Display and Scale Menu 5-21 Aux Outputs Menu 5-25 Cursor Setup Menu 5-29 Edit Mark Menu 5-31 Math Menu 5-33 Disk Menu 5-41 System Setup Menu 5-49 PROGRAMMING GPIB Communications 6-1 RS232 Communications 6-1 Status Indicators and Queues 6-1 Command Syntax 6-1 Interface Ready and Status 6-2 GET (Group Execute Trigger) 6-2 DETAILED COMMAND LIST 6-3 Reference and Phase 6-4 Input and Filter 6-6 Gain and Time Constant 6-7 Output and Offset 6-9 Trace and Scan 6-10 Display and Scale 6-11 Cursor 6-13 Mark 6-14 Aux Input and Output 6-15 Math 6-16 Store and Recall 6-18 Setup 6-19 Print and Plot 6-21 Front Panel and Auto Functions 6-22 Data Transfer 6-23 Interface 6-28 Status Reporting 6-29 STATUS BYTE DEFINITIONS 6-30 Serial Poll Status Byte 6-30 Service Requests 6-31 Standard Event Status Byte 6-29 LIA Status Byte 6-32 Error Status Byte 6-32 PROGRAM EXAMPLES Microsoft C, Nationall Instr GPIB 6-33 QUICKBASIC, Nationall Instr GPIB 6-39 TESTING Introduction 7-1 Preset 7-1 Serial Number 7-1 Firmware Revision 7-1 General Installation 7-2 Necessary Equipment 7-3 If A Test Fails 7-3 PERFORMANCE TESTS Self Tests 7-5 DC Offset 7-7 Common Mode Rejection 7-9 Amplitude Accuracy and Flatness 7-11 Amplitude Linearity 7-13 Frequency Accuracy 7-15 Phase Accuracy 7-17 Sine Output Amplitude 7-19 DC Outputs and Inputs 7-21 Input Noise 7-23 PERFORMANCE TEST RECORD 7-25 CIRCUITRY Circuit Boards 8-1 Video Driver and CRT 8-1 CPU Board 8-3 Power supply Board 8-5 DSP Logic Board 8-7 Analog Input Board 8-9 PARTS LISTS Power supply Board 8-11 Analog Input Board 8-13 DSP Logic Board 8-19 CPU Board 8-25 Chassis Assembly 8-29 Miscellaneous Parts 8-32 SCHEMATIC DIAGRAMS CPU Board Power supply Board DSP Logic Board Analog Input Board
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