SRS Labs SIM970 Manuel d'utilisation

Operation and Service Manual

Quad Digital Voltmeter

SIM970

Stanford Research Systems

Revision 1.19 •May 28, 2010

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 9-01559-903

SIM970 Quad Digital Voltmeter

Contents

General Information iii

Safety and Preparation for Use . . . . . . . . . . . . . . . . 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 – 3

1.3 Input Protection . . . . . . . . . . . . . . . . . . . . . . 1 – 4

1.4 Power-On ......................... 1–5

1.5 Restoring the Default Conﬁguration . . . . . . . . . . 1 – 6

1.6 SIMInterface........................ 1–7

2 Description of Operation 2 – 1

2.1 Operating Modes . . . . . . . . . . . . . . . . . . . . . 2 – 2

2.2 Autoranging........................ 2–8

2.3 Controlling the Mode and Auto Settings . . . . . . . . 2 – 9

2.4 Other Instrument Features . . . . . . . . . . . . . . . . 2 – 10

2.5 Triggering ......................... 2–10

3 Remote Operation 3 – 1

3.1 Index of Common Commands . . . . . . . . . . . . . . 3 – 2

3.2 Alphabetic List of Commands . . . . . . . . . . . . . . 3 – 4

3.3 Introduction ........................ 3–6

3.4 Commands......................... 3–6

3.5 StatusModel........................ 3–18

ii Contents

SIM970 Quad Digital Voltmeter

General Information

The SIM970 Quad Digital Voltmeter, part of Stanford Research Sys-

tems’ Small Instrumentation Modules family, consists of four isolated

digital voltmeter (DVM) channels. Five and a half digits of resolution

and overall accuracy are available for inputs within ±20 volts.

Safety and Preparation for Use

The front-panel inputs to the SIM970 are isolated from the Earth, the

power-line-outlet ground, the metal chassis of the module, and from

each other. No dangerous voltages are generated by the module.

However, if a dangerous voltage is applied to an input, it may be

WARNING present on the outer casing of the input coaxial (BNC) connector, and

may cause injury or death.

Do not exceed ±20 volts to the Earth at the positive (center) terminal of

each input connector. Do not exceed ±20 volts to the Earth at the negative

(shield) terminal of each input connector.

Do not install substitute parts or perform unauthorized modiﬁcations

to this instrument.

The SIM970 is a double-wide module designed to be used inside the

SIM900 Mainframe. Do not turn on the power to the mainframe or

apply voltage inputs to the module 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)

SIM970 Quad Digital Voltmeter

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 Overload.

•Signal names are set as BUSY.

•Signal levels are set as HIGH.

•Remote command names are set as *IDN?.

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

•Special ASCII characters are set as hCRi.

SIM970 Quad Digital Voltmeter

vi General Information

Speciﬁcations

Ranges, Resolution, and Noise

Under front-panel operation, the SIM970 has four voltage ranges.

See Table 2.1 for more details.

Range Maximum input

voltage Resolution [1] Noise,

counts rms [2, 3]

1±19.9999 V 100 µV 1.5

2±1.99999 V 10 µV 0.8

3±999.99 mV 10 µV 0.8

4±199.999 mV 1 µV 1.0

Conditions:

[1] 7 1

/2digits, or 24 bits, of resolution are available through the remote

interface.

[2] One count is a unit change in the least-signiﬁcant digit. Each front-

panel display of the SIM970 has a capacity of ±199999 counts.

[3] Measured over 360 consecutive readings.

Accuracy

Accuracy speciﬁcations [4, 5] are the same for all four channels. The

four channels have isolated circuitry, so no channel-matching speci-

ﬁcations exist.

In ±(reading ×10−6+counts) [2]

Range 24 hours,

(23 ±1)◦C

90 days,

(23 ±5)◦C

1 year,

(23 ±5)◦C

110 +2 50 +2 80 +2

22+2 50 +2 80 +2

32+2 50 +2 80 +2

42+4 50 +6 80 +6

(Relative to calibration standards [7])

Transfer accuracy: (24-hour count error)/2 (typ.) [6]

Conditions:

[4] Inside a fully occupied SIM900 Mainframe; following a 2-hour

warmup.

[5] Speciﬁcations apply to Ranges 1 through 4 only, locally triggered (Ta-

ble 2.1).

[6] Within 10 minutes and ±0.5◦C,within ±10% of the initial value, on a

ﬁxed range, input voltage between 10% and 100% of the maximum

for the range.

[7] The absolute accuracy of the SRS factory calibration standard with

respect to the United States NIST is 6 ×10−6of the reading.

SIM970 Quad Digital Voltmeter

General Information vii

Measuring Characteristics

Min Typ Max Units

Autoranging limits Range 1 1.90000 V

Range 2 .95000 1.99999 V

Range 3 190.00 999.99 mV

Range 4 199.999 mV

Input Resistance [8] 9.9 10.0 10.1 MΩ

3 GΩ

Bias current [9] 1 pA

Terminals Isolated BNC [10]

Protection, center to shield ±60 V

Protection, shield to Earth ±200 V

Trigger Source Local, external, or remote

External input Rear BNC; TTL; active LOW

Latency 480 µs

BUSY output Rear BNC; TTL; active HIGH

BUSY impedance 50 Ω

Measurement Method 24-bit, Delta-Sigma A/D converter

A/D linearity Corrected by ﬁrmware [11]

Normal-mode rejection [12] 90 dB

Common-mode rejection, DC [13] 125 dB

Output Update frequency, 50 Hz FPLC [5] 3.0 Hz

Update frequency, 60 Hz FPLC [5] 3.6 Hz

Settling time, Ranges 1–3 [5, 14] 1 s

Settling time, Range 4 [5, 14] 10 s

Displays Red numeric LED, 0.30”

Green LED, range and autorange

Operating Temperature [15] 0 40 ◦C

Power +5 V DC

Supply current 480 mA

Conditions:

[8] Input resistance is 10 MΩfor Ranges 1 through 4. Operating modes

with >3 GΩinput resistance exist (Table 2.1).

[9] At 23 ◦C.

[10] Amphenol 31–10–4052 or similar.

[11] Included in the accuracy speciﬁcations.

[12] At power-line frequency (FPLC): 59 Hz to 61 Hz or 49 Hz to 51 Hz.

[13] For 1 kΩunbalance in the shield.

[14] To within 3 counts of the ﬁnal reading, on a ﬁxed range, for an input

voltage step of 50% of the maximum voltage for the range, for 0 Ω

source impedance.

[15] Non-condensing.

SIM970 Quad Digital Voltmeter

viii General Information

General Characteristics

Number of channels 4

Interface Serial (RS–232) through SIM interface

Connectors BNC (4 front [10], 2 rear); DB–15 (male) SIM interface

Weight 2.3 lbs

Dimensions 3.000 W×3.600 H×7.000 D

SIM970 Quad Digital Voltmeter

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