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Related Manuals for SRS Labs SR540
Summary of Contents for SRS Labs SR540
- Page 1 MODEL SR540 OPTICAL CHOPPER...
- Page 3 MODEL SR540 OPTICAL CHOPPER Copyright © 1986, 1988, 1995, 1997 Stanford Research Systems, Inc. All Rights Reserved Rev. 2.5 (03/2005) Stanford Research Systems, Inc. 1290-D Reamwood Ave. Sunnyvale, CA 94089 USA (408) 744-9040...
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Page 5: Table Of Contents
TABLE OF CONTENTS Symbols used ………………………………………………………...………. Specifications ………………………………………………..………………. Safety & Preparation for Use …………………………………..……….. Quick Start Instructions ………………………………………………….. Operating Instructions Introduction …………………………………………………………… Frequency of Operation ……………………………………………… Changing Blades ………………………………………………………. Baseplate Removal ……………………………………………………. Applications Single Beam …………………………………………………………... Single Beam Chopping to 20 kHz …………………………………….. Dual Beam Experiments ………………………………………………. -
Page 7: Specifications
SPECIFICATIONS Chop Frequency 4 Hz to 400 Hz with 6 slot blade. 400 Hz to 3.7 kHz with 30 slot blade. Frequency Stability 250 ppm/°C typical. Long Term Frequency Drift < 2%, 100 Hz < f < 3700 Hz Phase Jitter 0.2°... -
Page 8: Safety & Preparation For Use
240V, use a 1/8 Amp fuse. LINE VOLTAGE SELECTION LINE CORD The SR540 operates from a 100V, 120V, 220V, This instrument has a detachable, three-wire or 240V nominal ac power source having a line power cord with a three-contact plug for frequency of 50 or 60 Hz. -
Page 9: Quick Start Instructions
Quick Start Instructions Make sure the correct line voltage is selected, the correct fuse is installed, and the power switch is off. Connect the chopper head to the controller with the supplied coiled cord. Mount the 30 slot wheel for 400 Hz to 3.7 kHz or the 6 slot wheel for 4 Hz to 400 Hz, and set the MAX FREQ/SLOT switch on the front panel for the desired frequency range. -
Page 10: Operating Instructions
MAX FREQ / SLOTS range. The Model SR540 Optical Chopper is used to square-wave modulate the intensity of optical signals. The unit can chop light sources at rates Always use the correct wheel as from 4 Hz to 3.7 kHz. -
Page 11: Applications
APPLICATIONS SINGLE BEAM EXPERIMENT In this application, a single optical beam is could be used, in which case the reference from chopped by the outer row of slots, and the the left BNC would be used. In either case, the reference output from the right BNC is used to REFERENCE MODE switch is in the 'up' lock the lock-in amplifier to a chop frequency... -
Page 12: Single Beam Chopping To 20 Khz
SINGLE BEAM EXPERIMENT WITH When a small diameter beam is chopped by a EFFECTIVE CHOP FREQUENCIES TO 20 blade, the light intensity vs. time is a square wave, I(t) = Io (sin wt + 1/3 sin 3wt + 1/5 sin 5wt +…). In certain situations very high chop frequencies are desirable. - Page 13 amplitude of the 5th harmonic term will depend The amplitude of the 5th harmonic vs. beam on beam size. For a beam with diameter b, size is plotted in figure 7. If your beam is much using the 30 slot wheel with a slot aperture L, larger than 0.5mm, you may wish to pass the the amplitude of the nth harmonic is given by, beam through an aperture or bring it to focus at...
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Page 14: Dual Beam Experiments
DUAL BEAM EXPERIMENTS In this arrangement, the output from a single ƒ is the response from the experimental arm. inner source is split in two and chopped at two If the detected signal in the experimental arm is different frequencies by the same chopper wheel ratioed to the detected signal in the control arm, (figure 8). -
Page 15: Detection At Sum & Difference Frequencies
This can be For duty cycles less than 20%, you should select done with the SR540 by mounting two identical the "pulse mode" reference level on the lock-in. Since the ƒ/6 notch is obscured when two blades blades and staggering their position relative to each other. -
Page 16: Calibration
Only one adjustment is required to calibrate the 4 kHz. Set the FREQUENCY ADJUST dial to SR540 Chopper Controller. The adjustment pot 7.5, and use a small screwdriver to adjust the located on the rear panel is used to match the MOTOR CAL pot so that the four digit display controller to the motor. -
Page 17: Frequency Synthesis
known phase, which is used to synthesize other are selected. The output frequency of the VCO reference outputs. is divided by U18, which is programmed to divide by 5 or 11 per the setting of the Logic signals at f & f/6 are generated by the REFERENCE MODE switch, SW1. -
Page 18: Power Supplies
more pulses to count, the reset to U15 will be asserted indefinitely. After a few seconds, R36 will charge C13 to assert the Disp Sel to U15, causing the contents of the counters (which are zero) to be displayed instead of the contents of the latches (which contain the last count). -
Page 19: Parts List
SR540 PARTS LIST Motor and Motor related Parts List C 15 5-00102-517 4.7U Capacitor, Tantalum, 35V, 20%, Rad 1-00030-100 4P4C Connector, Misc. 7-00055-700 12VDC Misc. Parts 3-00173-309 MOC70U2 Optical Switch 3-00173-309 MOC70U2 Optical Switch 7-00056-701 SR541 Printed Circuit Board R 30... - Page 20 SR540 PARTS LIST DX100 3-00203-301 1N5711 Diode 6-00002-611 .25A 3AG Fuse 1-00030-100 4P4C Connector, Misc. 1-00031-133 16 PIN SRA Connector, Male, Right Angle 4-00271-445 2.0K Pot, Multi-Turn, Side Adjust 4-00019-443 Pot, 10-Turn Panel 7-00054-701 SR540 Printed Circuit Board 7-00558-701 SR540 LED...
- Page 21 SR540 PARTS LIST R 41 4-00031-401 Resistor, Carbon Film, 1/4W, 5% R 42 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5% R 43 4-00059-401 Resistor, Carbon Film, 1/4W, 5% R 44 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5% R 45 4-00022-401 1.0M...
- Page 22 SR540 PARTS LIST 0-00524-048 8-1/4" #18 Wire, #18 UL1015 Strip 3/8 x 3/8 No Tin 0-00594-050 4-1/2" #18 BLUE Wire #18 UL1007 Stripped 3/8x3/8 No Tin 1-00003-120 Connector, BNC 1-00053-172 Line Cord 3-00556-340 HDSP-5323 Integrated Circuit (Thru-hole Pkg) 7-00064-720 SR540-7...
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