Stanford Research Systems SIM910 Manuel utilisateur

Operation and Service Manual

JFET Preamp

SIM910

Stanford Research Systems

Revision 2.1 •May 8, 2007

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 9-01553-903

SIM910 JFET Preamp

Contents

General Information iii

Safety and Preparation for Use . . . . . . . . . . . . . . . . iii

Symbols ............................. iv

Notation ............................. v

Speciﬁcations .......................... vi

1 Operation 1 – 1

1.1 Instrument Overview . . . . . . . . . . . . . . . . . . . 1 – 2

1.2 Front Panel Operation . . . . . . . . . . . . . . . . . . 1 – 2

1.3 Rear Panel Output . . . . . . . . . . . . . . . . . . . . 1 – 5

1.4 SIMInterface........................ 1–6

2 Remote Operation 2 – 1

2.1 Index of Common Commands . . . . . . . . . . . . . . 2 – 2

2.2 Alphabetic List of Commands . . . . . . . . . . . . . . 2 – 3

2.3 Introduction ........................ 2–4

2.4 Commands......................... 2–5

2.5 RegisterModel ...................... 2–9

3 Performance Tests 3 – 1

3.1 Oﬀset............................ 3–2

3.2 Calibration......................... 3–2

3.3 Performance Tests . . . . . . . . . . . . . . . . . . . . . 3 – 3

3.4 SIM910 Performance Test Record . . . . . . . . . . . . 3 – 4

4 Circuitry 4 – 1

4.1 Circuit Discussion . . . . . . . . . . . . . . . . . . . . . 4 – 2

4.2 PartsList.......................... 4–4

4.3 Schematic Diagrams . . . . . . . . . . . . . . . . . . . 4 – 4

ii Contents

SIM910 JFET Preamp

General Information

The SIM910 JFET Preamp, part of Stanford Research Systems’ Small

Instrumentation Modules family, is a low noise general purpose volt-

age preampliﬁer with bandwidth from DC to 1 MHz.

Safety and Preparation for Use

Biomedical Applications

Under certain conditions, the SIM910 may prove to be unsafe for

applications involving human subjects. Incorrect grounding, com-

WARNING ponent failure, and excessive common-mode input voltages are ex-

amples of conditions in which the instrument may expose the subject

to large input currents. Therefore, Stanford Research Systems does

not recommend the SIM910 for such applications.

Regarding Use with Photomultipliers

The front-end ampliﬁer of this instrument is easily damaged if a

photomultiplier is used improperly with the ampliﬁer. When left

CAUTION completely unterminated, a cable connected to a PMT can charge

to several hundred volts in a relatively short time. If this cable is

connected to the inputs of the SIM910, the stored charge may damage

the front-end JFETs. To avoid this problem, provide a leakage path of

about 100 kΩto ground inside the base of the PMT to prevent charge

accumulation.

Service

Do not install substitute parts or perform any unauthorized modiﬁ-

cations to this instrument.

The SIM910 is a single-wide module designed to be used inside the

SIM900 Mainframe. Do not turn on the power until the module is

completely inserted into the mainframe and locked in place.

iii

iv 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)

SIM910 JFET Preamp

General Information v

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.

•Front-panel buttons are set as [Button];

[Adjust ] is shorthand for “[Adjust ] & [Adjust ]”.

•Front-panel indicators are set as OVLD.

•Remote command names are set as *IDN?.

•Literal text other than command names is set as OFF.

SIM910 JFET Preamp

vi General Information

Speciﬁcations

Performance Characteristics

Frequency range DC to 1 MHz; −3 dB @ 1.9 MHz, typ.

Gain 1, 2, 5, 10, 20, 50, 100

Gain accuracy ±0.5 % DC to 100 kHz

±5 % @ 1 MHz, typ.

Gain stability 200 ppm/◦C

Input voltage noise (RTI, gain ≥10) 4 nV/√Hz@ 1 kHz, typ.

gain 1 12 nV/√Hz@ 1 kHz, typ.

Input current noise <10 fA/√Hz, typ.

Input impedance 100 MΩ// 35 pF

Input Bias Current (DC) 0.5 pA, typ.

Output impedance 50 Ω

AC coupling frequency 16 mHz −3dB

Input selection A, A−B, GND

Input coupling AC or DC

Input shields Floating or ground

Maximum input, diﬀerential ±1 V before overload

Maximum input, common-mode ±5 V

clamped at ±6 V

Maximum output voltage ±10 V before overload

Maximum output current ±100 mA before overload

Maximum slew rate 0.4 V/µs RTI, typ.

2.4 V/µs RTO, typ.

CMRR 85 dB @ 1 kHz

Oﬀset stability ±10 ppm/◦C max

Operating temperature 0 ◦C to 40 ◦C, non-condensing

Power +5 V (50 mA typ., 100 mA max.)

±15 V (50 mA typ., 300 mA max.)

General Characteristics

Interface Serial (RS-232) through SIM interface

Connectors BNC (3 front, 1 rear)

DB–15 (male) SIM interface

Weight 1.5 lbs

Dimensions 1.500 W×3.600 H×7.000 D

SIM910 JFET Preamp

1 Operation

The SIM910 JFET Preamp is a ﬂexible low noise voltage preampliﬁer

for general use from DC to 1 MHz. This chapter gives the necessary

information to get started quickly with the SIM910.

In This Chapter

1.1 Instrument Overview . . . . . . . . . . . . . . . . . . 1 – 2

1.2 Front Panel Operation . . . . . . . . . . . . . . . . . . 1 – 2

1.2.1 Gain ........................ 1–3

1.2.2 Oﬀset........................ 1–3

1.2.3 Overload...................... 1–3

1.2.4 Inputs ....................... 1–4

1.2.5 Output....................... 1–4

1.3 Rear Panel Output . . . . . . . . . . . . . . . . . . . . 1 – 5

1.4 SIMInterface ....................... 1–6

1.4.1 SIM interface connector . . . . . . . . . . . . . 1 – 6

1.4.2 Direct interfacing . . . . . . . . . . . . . . . . . 1 – 6

1–1

1–2 Operation

1.1 Instrument Overview

The SIM910 is a voltage preampliﬁer with low input and output

noise. It provides selectable gain from 1 to 100 of a single ended or

true diﬀerential signal. The ampliﬁer runs from DC to 1 MHz, or can

be AC coupled with 16 mHz −3dB frequency. In addition, the input

BNC shields can be grounded or ﬂoated allowing the signal ground

to be referenced to a local or remote ground. An overload light

indicates when the input or output maximum voltage, or maximum

output current has been reached.

The ampliﬁer settings can be controlled either by the front panel

buttons or the remote serial interface. Digital noise is eliminated by

only clocking the microprocessor when settings are being changed.

The complete ampliﬁer conﬁguration (i.e., gain settings, coupling,

etc.) is saved in non-volatile memory.

The front end ampliﬁer of this instrument is protected with a pair of

100 Ωresistors (R103 & R104). Note that the internal-grounding in-

put conﬁguration grounds the ampliﬁer inputs after these protection

resistors.

A block diagram of the ampliﬁer is shown below in Figure 1.1.

INPUT

A / A-B

AC /

SHIELD

FLOAT/GND

INPUT

GROUND

FRONT

END PROGRAMMABLE

GAIN

Ω

OUTPUT

REAR

PANEL

OUT

INPUT

PROTECTION

Figure 1.1: The SIM910 block diagram.

1.2 Front Panel Operation

All SIM910 conﬁgurations can be speciﬁed either from the front

panel, or by commanding through the remote serial interface. The

front panel is shown below (Figure 1.2). The front panel contains the

SIM910 JFET Preamp

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