Stanford Research Systems SIM984 Operation And Service Manual

Operation and Service Manual

Isolation Amplifier

SIM984

Distribution in the UK & Ireland

Characterisation,
Measurement &
Analysis

Stanford Research Systems

Lambda Photometrics Limited

Lambda House Batford Mill
Harpenden Herts AL5 5BZ
United Kingdom

E: [e-mail]
W: www.lambdaphoto.co.uk
T: [phone]
F: [phone]

Revision 1.13 • March 11, 2013

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 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
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.

Copyrightc Stanford Research Systems, Inc., 2013. All rights reserved.

Stanford Research Systems, Inc.
1290–D Reamwood Avenue
Sunnyvale, CA 94089 USA
Phone: [phone] • Fax: [phone]

www.thinkSRS.com • e-mail: [e-mail]

Printed in U.S.A. Document number 9-01691-903

SIM984 Isolation Amplifier

Contents

General Information iii

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

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

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

1 Getting Started 1 – 1

1.1 Introduction to the Instrument ............. 1–2

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

1.3 SIM Interface ........................ 1–4

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 ......................... 2–4

2.5 Status Model ........................ 2–13

3 Circuitry 3 – 1

3.1 Circuit Descriptions .................... 3–2

3.2 Schematic Diagrams ................... 3–3

i

ii Contents

SIM984 Isolation Amplifier

General Information

Service

The SIM984 Isolation Amplifier, part of Stanford Research Systems’
Small Instrumentation Modules family, is a wide bandwidth, low
noise isolation amplifier for use with analog signals from DC to
1 MHz.

Do not install substitute parts or perform any unauthorized modifi­cations to this instrument.

The SIM984 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)

SIM984 Isolation Amplifier

General Information v

Notation

The following notation will be used throughout this manual.

WARNING

CAUTION

A warning means that injury or death is possible if the instructions
are not obeyed.

A caution means that damage to the instrument or other equipment
is possible.

Typesetting conventions used in this manual are:

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

• 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 SIM984 are set
as straight teletype font, while responses received by the host
computer from the SIM984 are set as slanted teletype font.

SIM984 Isolation Amplifier

vi General Information

Specifications

Performance Characteristics

Isolation voltage ±1000 V (max)

Leakage current

Isolation capacitance 1000 pF

Isolation Mode Rejection Ratio (IMRR)

Maximum input

Input impedance

Input noise (typ.)

Input offset drift

Output voltage range ±10 V

Output current

Output resistance

Output offset

Output offset drift

Output noise (typ.)

Gain × 1, × 10, × 100

Gain accuracy

THD

Frequency range

Output Slew rate

Operating temperature 0◦Cto40◦C, non-condensing

Power

<2 μA at 1000 Vdc

150 dB at DC
±10 V
1MΩ
15 nV/√Hz @ 1 kHz
3 μV/◦C (typ.)

±20 mA (max.)
50 Ω
±0.1 V, adjustable
1mV/◦C (typ.)
80 μVrms (100Hz bandwidth)
200 μVrms (10kHz bandwidth)

1.5 mVrms (1MHz bandwidth)

±0.5%

0.005% (1 kHz, 600 Ω load)
DC to 100 Hz (low BW)
DC to 10 kHz (medium BW)
DC to 1 MHZ (high BW)
25 V/μs (Vout = 20Vpp)

+5 V (100 mA)
±15 V (300 mA)
+24 V (100 mA)

General Characteristics

Interface

Connectors banana jack (2 front)

Weight 1.5 lbs

Dimensions 1.5W ×3.6H ×7.0D

Serial (RS-232) through SIM interface

BNC (1 front, 1 rear)
DB–15 (male) SIM interface

SIM984 Isolation Amplifier

1 Getting Star ted

In This Chapter

This chapter gives you the necessary information to get started
quickly with the SIM984 Isolation Amplifier.

1.1 Introduction to the Instrument ............. 1–2

1.1.1 Overview ..................... 1–2

1.1.2 Power-on State .................. 1–2

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

1.2.1 Inputs ....................... 1–2

1.2.2 Gain ........................ 1–2

1.2.3 Bandwidth ..................... 1–3

1.2.4 Output ....................... 1–3

1.3 SIM Interface ....................... 1–4

1.3.1 SIM interface connector ............. 1–4

1.3.2 Direct interfacing ................. 1–5

1–1

1–2 Getting Started

1.1 Introduction to the Instrument

The SIM984 Isolation Amplifier is a low-noise, programmable gain
amplifier for isolating analog signals from DC to 1 MHz.

1.1.1 Overview

The basic function of the SIM984 is to isolate and (possibly) amplify
an analog signal. The input presents a 1 MΩimpedance between the
red and black banana jacks, but is high impedance (floating) between
each input jack and chassis ground. A maximum of ±1000Vdc can be
between either jack and ground, but the potential between the input
jacks must be less than ±10 V. The input is DC coupled.

A gain of ×1, ×10, or ×100 can be set from the front panel. The output
bandwidth is also adjustable from the front panel, with three choices
of high-frequency cut-off: 100 Hz, 10 kHz, and 1 MHz. Finally, the
output DC offset can be trimmed using a thin screwdriver accessing
the “Offset” hole near the output BNC.

1.1.2 Power-on State

The SIM984 stores its operation state (gain and bandwidth configu­ration) in non-volatile memory. At power-on, the SIM984 will return
to its previous configuration after a brief system check and initializa­tion.

1.2 Front-Panel Operation

The front panel of the SIM984 (see Figure 1.1) provides a simple
operator interface.

1.2.1 Inputs

The input to the SIM984 is through the red and black banana jacks in
the front-panel “INPUT” block.

WARNING

1.2.2 Gain

The banana jacks are isolated from the chassis for use with insulated
test leads. If the user connects a BNC–to–Banana adaptor to the
SIM984 to allow inputs from a BNC-terminated cable, it is critical
that no dangerous voltages be applied to the cable, as the exposed
shield of the input BNC could create an electrical hazard.

User gain settings of ×1, ×10, and ×100, are selected with the left and
right [Gain] buttons.

SIM984 Isolation Amplifier