SRS Labs SR124 Manuale utente

Operation and Service Manual

Analog Lock-In Ampliﬁer

SR124

Stanford Research Systems

Revision 1.02 •February 3, 2014

Certiﬁcation

Stanford Research Systems certiﬁes that this product met its published speciﬁcations at the time

of shipment.

Warranty

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

ship 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

authorized service facility. Contact Stanford Research Systems or an authorized representative

before returning 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 U.S.A. Document number 9-01688-903

SR124 Analog Lock-In Ampliﬁer

Contents

General Information v

Safety and Preparation for Use . . . . . . . . . . . . . . . . v

Symbols ............................. vi

Notation ............................. vii

Speciﬁcations .......................... viii

1 Getting Started 1 – 1

1.1 How to use this manual . . . . . . . . . . . . . . . . . 1 – 2

1.2 Basic instrument check-out . . . . . . . . . . . . . . . 1 – 2

1.2.1 Equipment needed . . . . . . . . . . . . . . . . 1 – 2

1.3 Preparations before use . . . . . . . . . . . . . . . . . . 1 – 2

1.4 Signal and input ﬁlter . . . . . . . . . . . . . . . . . . . 1 – 3

1.5 Phase sensitive detector . . . . . . . . . . . . . . . . . 1 – 4

1.6 Reserve........................... 1–5

1.7 Output oﬀset........................ 1–6

1.8 Reference oscillator external input . . . . . . . . . . . 1 – 7

1.9 Reference oscillator output . . . . . . . . . . . . . . . . 1 – 8

2 Introduction 2 – 1

2.1 Introduction to the instrument . . . . . . . . . . . . . 2 – 2

2.1.1 Clock stopping architecture . . . . . . . . . . . 2 – 2

2.1.2 What does the SR124 measure? . . . . . . . . . 2 – 2

2.2 Instrument overview . . . . . . . . . . . . . . . . . . . 2 – 3

2.2.1 Reference section . . . . . . . . . . . . . . . . . 2 – 3

2.2.2 Signal section . . . . . . . . . . . . . . . . . . . 2 – 6

2.2.3 Input Filter . . . . . . . . . . . . . . . . . . . . 2 – 9

2.2.4 Output....................... 2–10

2.3 Navigating the front panel . . . . . . . . . . . . . . . . 2 – 11

2.3.1 Signal input section . . . . . . . . . . . . . . . . 2 – 12

2.3.2 Output section . . . . . . . . . . . . . . . . . . 2 – 14

2.3.3 Setup section . . . . . . . . . . . . . . . . . . . 2 – 15

2.3.4 Reference section . . . . . . . . . . . . . . . . . 2 – 17

3 Performance Details 3 – 1

3.1 Sensitivity and gain . . . . . . . . . . . . . . . . . . . . 3 – 2

3.1.1 ACGain ...................... 3–2

3.1.2 Scale normalization . . . . . . . . . . . . . . . . 3 – 3

ii Contents

3.1.3 DCgain ...................... 3–4

3.2 Dynamic reserve and overloads . . . . . . . . . . . . . 3 – 4

3.3 Input ﬁlter details . . . . . . . . . . . . . . . . . . . . . 3 – 6

3.4 Attenuators and DC bias constraints . . . . . . . . . . 3 – 9

3.5 Automatic functions . . . . . . . . . . . . . . . . . . . 3 – 9

3.5.1 Auto-phase . . . . . . . . . . . . . . . . . . . . 3 – 9

3.5.2 Auto-gain ..................... 3–10

3.5.3 Auto-oﬀset..................... 3–10

3.5.4 Lock assist . . . . . . . . . . . . . . . . . . . . . 3 – 10

4 Remote Operation 4 – 1

4.1 Index of commands . . . . . . . . . . . . . . . . . . . . 4 – 2

4.2 Alphabetic list of commands . . . . . . . . . . . . . . . 4 – 4

4.3 Introduction ........................ 4–6

4.3.1 Interface conﬁguration . . . . . . . . . . . . . . 4 – 6

4.3.2 Buﬀers ....................... 4–6

4.3.3 Remote /local................... 4–6

4.4 Commands......................... 4–7

4.4.1 Command syntax . . . . . . . . . . . . . . . . . 4 – 7

4.4.2 Notation...................... 4–8

4.4.3 Examples ..................... 4–8

4.4.4 Reference and phase commands . . . . . . . . 4 – 9

4.4.5 Input commands . . . . . . . . . . . . . . . . . 4 – 11

4.4.6 Filter commands . . . . . . . . . . . . . . . . . 4 – 12

4.4.7 Gain and time constant commands . . . . . . . 4 – 13

4.4.8 Output commands . . . . . . . . . . . . . . . . 4 – 14

4.4.9 Setup commands . . . . . . . . . . . . . . . . . 4 – 15

4.4.10 Auto commands . . . . . . . . . . . . . . . . . 4 – 16

4.4.11 Data transfer commands . . . . . . . . . . . . . 4 – 17

4.4.12 Interface commands . . . . . . . . . . . . . . . 4 – 18

4.4.13 Status commands . . . . . . . . . . . . . . . . . 4 – 20

4.5 Statusmodel........................ 4–23

4.5.1 Status byte (SB) . . . . . . . . . . . . . . . . . . 4 – 23

4.5.2 Service request enable (SRE) . . . . . . . . . . 4 – 24

4.5.3 Standard event status (ESR) . . . . . . . . . . . 4 – 24

5 Circuits 5 – 1

5.1 Overview of circuits . . . . . . . . . . . . . . . . . . . 5 – 2

5.2 PowerSupply ....................... 5–2

5.3 CPU............................. 5–2

5.4 FrontPanel......................... 5–2

5.5 Mainboard......................... 5–2

SR124 Analog Lock-In Ampliﬁer

Contents iii

5.6 Oscillator.......................... 5–4

5.7 Rearoutputs........................ 5–5

5.8 Communications . . . . . . . . . . . . . . . . . . . . . 5 – 5

5.9 Schematics......................... 5–5

SR124 Analog Lock-In Ampliﬁer

iv Contents

SR124 Analog Lock-In Ampliﬁer

General Information

Safety and Preparation for Use

Dangerous voltages, capable of causing injury or death, are

WARNING present in this instrument. Do not remove the product covers

or panels. Do not apply power or operate the product without

all covers and panels in place.

AC line voltage

The SR124 Analog Lock-In Ampliﬁer operates from a 100 V, 120 V,

220 V, or 240 V nominal AC power source having a line frequency of

50 Hz or 60 Hz. Before connecting the power cord to a power source,

verify that the LINE VOLTAGE SELECTOR, located in the rear panel

power-entry module, is set so that the correct AC line voltage value

is visible.

The SR124 Analog Lock-In Ampliﬁer will be damaged if operated

CAUTION with the LINE VOLTAGE SELECTOR set for the wrong AC line

voltage, or if the wrong fuses are installed. Verify that the correct

line fuses are installed before connecting the line cord. Fuse size is

5MF “fast blow” (5×20 mm). For 100 V/120 V, use 4 A fuses; for

220 V/240 V, use 2 A fuses.

Line cord

The SR124 Analog Lock-In Ampliﬁer 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 SR124 Analog Lock-In Ampliﬁer does not have any user service-

able parts inside. Refer service to a qualiﬁed technician.

Do not install substitute parts or perform any unauthorized modi-

ﬁcations to this instrument. Contact the factory for instructions on

how to return the instrument for authorized service and adjustment.

vi General Information

Symbols you may Find on SRS Products

Symbol Description

Alternating current

Caution - risk of electric shock

Frame or chassis terminal

Caution - refer to accompanying documents

Earth (ground) terminal

Battery

Fuse

On (supply)

Off (supply)

SR124 Analog Lock-In Ampliﬁer

General Information vii

Notation

The following notation will be used throughout this manual.

A warning means that injury or death is possible if the instructions

WARNING are not obeyed.

A caution means that damage to the instrument or other equipment

CAUTION is possible.

Typesetting conventions used in this manual are:

•Front-panel buttons are set as [Button]

•Front-panel knobs are set as 







Knob

•Front-panel indicators are set as Overload

•Remote command names are set as *IDN?

•Literal text other than command names is set as OFF

Remote command examples will all be set in monospaced font. In

these examples, data sent by the host computer to the SR124 are set

as straight teletype font, while responses received by the host

computer from the SR124 are set as slanted teletype font.

SR124 Analog Lock-In Ampliﬁer

viii General Information

Speciﬁcations

All performance speciﬁcations after 1 hour warm-up at 23 ◦C±2◦C

ambient.

Signal channel

Parameter Speciﬁcation

Voltage inputs Single-ended or diﬀerential

Sensitivity 100 nV to 500 mV, in 1-2-5 steps

Current input 106V/A or 108V/A

Input impedance

Voltage 10 MΩ + 25 pF, AC or DC coupled

Current 100 Ω(1 kΩ) to virtual ground,

106(108) V/A scale

Gain accurancy ±1% at 1 kHz

Gain stability 100 ppm/◦C

(ﬂat mode, normal reserve)

Input noise, typ. 2.8 nV/√Hz at 1 kHz

0.14 pA/√Hz at 1 kHz (106V/A)

0.014 pA/√Hz at 100 Hz (108V/A)

Input ﬁlter (Tunable from 2 Hz to 100 kHz)

Flat Flat within ±1% from 10 Hz to 20 kHz

±5% from 2 Hz to 100 kHz

Band pass Q of 1, 2, 5, 10, 20, 50, and 100

High pass −12 dB/oct rolloﬀ

Low pass −12 dB/oct rolloﬀ

Notch Up to 80 dB attenuation

CMRR 90 dB below 10 kHz, DC coupled

decreasing by 6 dB/oct above 10 kHz

Dynamic reserve (without band pass ﬁlter)

Low noise 20 dB

Normal 40 dB

High reserve 60 dB

SR124 Analog Lock-In Ampliﬁer

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