SRS Labs SR542 Manuale operativo

Operation and Service Manual

Precision Optical Chopper

SR542

Stanford Research Systems

Revision 1.0 April 7, 2022

Certication

Stanford Research Systems certies that this product met its published specications at the time of

shipment.

Warranty

This Stanford Research Systems product is warranted against defects in materials and workmanship

for a period of one (1) year from the date of shipment.

Service

For warranty service or repair, this product must be returned to a Stanford Research Systems autho‑

rized service facility. Contact Stanford Research Systems or an authorized representative before re‑

turning this product for repair.

Information in this document is subject to change without notice.

Stanford Research Systems, Inc.

1290–D Reamwood Avenue

Sunnyvale, CA 94089 USA

Phone: (408) 744‑9040 Fax: (408) 744‑9049

www.thinkSRS.com e‑mail: [email protected]

Printed in the U.S.A. Document Number 9‑01764‑903

SR542 Precision Optical Chopper

Contents

General Information 1

Safety and Preparation for Use . . . . . . . . . . . . . . . . . . . 2

ACLineVoltage ........................ 2

LineCord............................ 2

Service ............................. 2

SymbolsontheSR542........................ 3

Notation ............................... 3

Specications............................. 4

Blade Specications . . . . . . . . . . . . . . . . . . . . . . 5

Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . . . 7

Controller............................ 7

ChopperHead ......................... 8

ChopperBlade......................... 9

1 Geing Started 11

1.1 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . 12

1.2 Quick Start Guide . . . . . . . . . . . . . . . . . . . . . . . 12

1.2.1 Preparations for Use . . . . . . . . . . . . . . . . . . 12

1.2.2 Lock to Internal Frequency . . . . . . . . . . . . . . 13

1.2.3 Lock to External Frequency . . . . . . . . . . . . . . 14

1.2.4 Use with a Lock‑In Amplier . . . . . . . . . . . . . 15

2 Operation 17

2.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . 18

2.1.1 Chopper Control Loop . . . . . . . . . . . . . . . . 18

2.1.2 ChopMode.......................20

2.1.3 ShuerMode......................23

2.2 Front Panel Control . . . . . . . . . . . . . . . . . . . . . . 25

2.2.1 Power..........................25

2.2.2 Numeric Display . . . . . . . . . . . . . . . . . . . . 25

2.2.3 Conguration . . . . . . . . . . . . . . . . . . . . . 28

2.2.4 Display/Adjust . . . . . . . . . . . . . . . . . . . . . 30

2.2.5 Numeric Entry . . . . . . . . . . . . . . . . . . . . . 31

2.2.6 Phase ..........................32

2.2.7 Motor..........................32

2.2.8 Setup ..........................33

2.3 Rear Panel Connections and Signals . . . . . . . . . . . . . 35

2.3.1 Source Inputs and Output . . . . . . . . . . . . . . . 36

2.3.2 Reference Outputs . . . . . . . . . . . . . . . . . . . 37

2.3.3 Synthesized Outputs . . . . . . . . . . . . . . . . . 37

i SR542 Precision Optical Chopper

ii Contents

3 Remote Operation 39

3.1 List of Commands by Subject . . . . . . . . . . . . . . . . . 40

3.2 List of Commands by Name . . . . . . . . . . . . . . . . . 42

3.3 Introduction ..........................44

3.3.1 Interface Conguration . . . . . . . . . . . . . . . . 44

3.3.2 Remote Interface Buers . . . . . . . . . . . . . . . 44

3.4 Commands...........................44

3.4.1 Command Syntax . . . . . . . . . . . . . . . . . . . 44

3.4.2 Notation ........................45

3.4.3 Examples........................45

3.4.4 Conguration Commands . . . . . . . . . . . . . . 46

3.4.5 Chopper Operation Commands . . . . . . . . . . . 49

3.4.6 Setup Commands . . . . . . . . . . . . . . . . . . . 50

3.4.7 Interface Commands . . . . . . . . . . . . . . . . . 52

3.4.8 Status Commands . . . . . . . . . . . . . . . . . . . 54

3.5 StatusModel ..........................57

3.5.1 Status Byte (SB) Register . . . . . . . . . . . . . . . 58

3.5.2 Service Request Enable (SRE) Register . . . . . . . . 58

3.5.3 Standard Event Status Register (ESR) . . . . . . . . 59

3.5.4 Standard Event Status Enable (ESE) Register . . . . 59

3.5.5 Chopper Status (CHCR/CHEV) Registers . . . . . . 60

3.6 ErrorCodes...........................62

3.6.1 Command Execution Errors . . . . . . . . . . . . . 62

3.6.2 Command Parsing Errors . . . . . . . . . . . . . . . 63

3.6.3 Communication Errors . . . . . . . . . . . . . . . . 63

3.6.4 Motor Errors . . . . . . . . . . . . . . . . . . . . . . 64

3.6.5 Device‑Dependent Errors . . . . . . . . . . . . . . . 64

3.6.6 Other Errors . . . . . . . . . . . . . . . . . . . . . . 64

4 Applications 65

4.1 Single Beam Experiment . . . . . . . . . . . . . . . . . . . . 66

4.2 Dual Beam Experiment . . . . . . . . . . . . . . . . . . . . 67

4.3 Detection at Sum and Dierence Frequencies . . . . . . . . 68

5 Troubleshooting 69

5.1 Chopper Head Cable Shield Grounding . . . . . . . . . . . 69

Index 71

SR542 Precision Optical Chopper

General Information

Safety and Preparation for Use . . . . . . . . . . . . . . . . . 2

ACLineVoltage ....................... 2

LineCord........................... 2

Service ............................ 2

Symbols on the SR542 . . . . . . . . . . . . . . . . . . . . . . 3

Notation .............................. 3

Specications ........................... 4

Blade Specications . . . . . . . . . . . . . . . . . . . . . 5

Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . 7

Controller........................... 7

ChopperHead ........................ 8

ChopperBlade........................ 9

1 SR542 Precision Optical Chopper

2General Information

Safety and Preparation for Use

WARNING

Dangerous voltages, capable of causing injury or death, are present in

this instrument. These voltages can persist for many minutes after AC

power is removed. Do not remove the product covers or panels. Do

not apply power or operate the product without all covers and panels

in place.

CAUTION

This product employs a motor capable of turning at high speeds. The

rotating blade poses injury risk. Rotating parts also pose an entangle‑

ment hazard for loose clothing or long exposed hair. To prevent acci‑

dental personal injury or damage to the instrument, secure the included

shroud over the chopper blade before operation.

AC Line Voltage

The SR542 Precision Optical Chopper operates from a 90 V–250 V nom‑

inal AC power source having a line frequency of 50 Hz or 60 Hz.

Line Cord

The SR542 Precision Optical Chopper has a detachable, three‑wire

power cord for connection to the power source and to a protective

ground. The chassis of the instrument is connected to the outlet ground

to protect against electrical shock. Always use an outlet which has a

properly connected protective ground.

Service

The only user‑serviceable part inside the chassis is jumper J503, for se‑

lection of ground connection of the 10P10C chopper head cable shield.

Please refer to Section 5.1 for instructions. Do not aempt to service or

adjust this instrument unless another person, capable of providing rst

aid or resuscitation, is present. The SR542 Precision Optical Chopper

otherwise does not have any user serviceable parts inside. Refer service

to a qualied technician.

Do not install substitute parts or perform any unauthorized modica‑

tions to this instrument. Contact the factory for instructions on how to

return the instrument for authorized service and adjustment.

SR542 Precision Optical Chopper

Symbols on the SR542 3

Symbols on the SR542

Warning Risk of electric shock. Injury or death is possible

if the instructions are not obeyed.

Caution Refer to user manual. Damage to the instrument

or other equipment is possible.

Caution Injury is possible due to rotating parts.

Power Toggle instrument power.

Chassis

Ground

Notation

Typeseing conventions used in this manual, with examples of each.

Use case Example

Front‑panel buons Run /

Stop

Front‑panel text Locked ,Int Freq ,Source

Remote command names *IDN?

Literal text (sent) *IDN?

Literal text (received) Stanford_Research_Systems,SR542,s/n00000001,v1.0.0

SR542 Precision Optical Chopper

4General Information

Specications

Frequency

Shaft shaft Hz to Hz

Chop slots shaft Hz to Hz (2‑slot blade)

Hz to kHz (10/100‑slot blade)

Sources (4) Internal Clock, VCO, AC Line, Ext Sync

Accuracy ±20 ppm

Stability ±20 ppm/year

Resolution 6 digits

Multiplier, ninteger, 1–200

Divisor, minteger, 1–200

Phase

Resolution 

Jier (opt, rms)

(preliminary)

Slot Count at min at min at max

2(Hz) (Hz) (Hz)

5(Hz) (Hz) (kHz)

6(Hz) (Hz) (kHz)

10 (Hz) (Hz) (kHz)

25 (Hz) (Hz) (kHz)

30 (Hz) (Hz) (kHz)

100 (Hz) (Hz) (kHz)

jitter opt jitter μs

chop period μs360opt

Inputs (2 BNCs)

Impedance M

VCO Voltage 0 to +10 V dc

VCO Accuracy (typ.) ±100 ppm

Ext Sync TTL Minimum 2 V logic level

Ext Sync Sine 100 mV rms to 1 V rms signal, AC‑coupled (>1 Hz)

Edge Trigger TTL Rising, TTL Falling, or Sinusoidal

Outputs (6 BNCs)

Voltage 0 V to +5 V logic levels, sourced through 

Signals Source, Shaft (1 PPR), Inner Slots, Outer Slots,

Sum OUTER INNER, Dierence OUTER INNER

Operation

Control Modes Chopping: synchronize Shaft, Inner, or Outer to source 



Shuer: xed angular position

Remote Interface USB type B receptacle; serial port emulation, 115,200 baud

Temperature +C to +C

Power <W, 90–250 Vac, 50/60 Hz

Dimensions

Controller 8.3” 4.1” 9.2” (WHL)

Head with Shroud 4.31” 4.65” 3.75” (WHL)

Weight

Controller 4.6 lbs

Head with Shroud 1.2 lbs

SR542 Precision Optical Chopper

Specications 5

Blade Specications

The chopper blades designed for the SR542 are chemically etched for

precision tolerancing of the beam apertures. The blade outer diameter is

4” and thickness is 0.010”. For detailed dimensioning, see Figure 4. For

dual‑frequency blades with two tracks of slots (apertures), the tracks are

referred to throughout this manual as “inner” and “outer.” Note that the

inner track is duplicated near the outermost circumference of the blade

so that the corresponding sloed opto‑interrupter on the chopper head

can detect the inner slots.

Table 1: Available chopper blades. For dual‑frequency blades, the inner and outer number of slots and maximum

beam diameter are indicated as (Inner/Outer). O542DF is a variable duty factor blade, with available duty cycles

from 10‑90%.

Part Num Num Slots Max Beam Diam (in) Chop Frequency Range (Hz)

O5422 2 1.150 0.4 – 400

O5425 5 0.873 1 – 1 k

O54230 30 0.184 6 – 6 k

O54256 5 / 6 0.626 / 0.500 1 – 1.2 k

O5422530 25 / 30 0.157 / 0.184 5 – 6 k

O54210100 10 / 100 0.358 / 0.057 2 – 20 k

O542DF 6 0.128 1.2 – 1.2 k

SR542 Precision Optical Chopper

6General Information

O54256 5/6 Slot O5422530 25/30 Slot O54210100 10/100 Slot

O542DF Variable Duty (10%–90%)

O5422 2 Slot O5425 5 Slot O54230 30 Slot

Figure 1: Available chopper blades for the SR542. Max beam size for outer (red) and inner (blue) tracks are listed

in Table 1. The variable duty factor blade permits selection of duty factor from 10% to 90% in 10% increments

depending on the radial placement of the beam spot.

SR542 Precision Optical Chopper

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