SRS Labs SIM922 Manuale operativo
Operation and Service Manual
Diode Temperature Monitor
SIM922
Stanford Research Systems
Revision 1.5 •September 17, 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.
Copyright c
Stanford Research Systems, Inc., 2003, 2010. All rights reserved.
Stanford Research Systems, Inc.
1290–D Reamwood Avenue
Sunnyvale, CA 94089 USA
Phone: (408) 744-9040 •Fax: (408) 744-9049
Printed in U.S.A. Document number 9-01556-903
SIM922 Diode Temperature Monitor
Contents
General Information iii
Service .............................. 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 Sensor Interface . . . . . . . . . . . . . . . . . . . . . . 1 – 3
1.4 SIMInterface........................ 1–5
2 Remote Operation 2 – 1
2.1 Index of Common Commands . . . . . . . . . . . . . . 2 – 2
2.2 Alphabetic List of Commands . . . . . . . . . . . . . . 2 – 4
2.3 Introduction ........................ 2–6
2.4 Commands......................... 2–7
2.5 StatusModel........................ 2–17
i
ii Contents
SIM922 Diode Temperature Monitor
General Information
The SIM922 Diode Temperature Monitor, part of Stanford Research
Systems’ Small Instrumentation Modules family, consists of four
channels of sensor excitation and readout for precision low-noise
diode thermometry. Independent 10 µA DC current sources provide
sensor excitations to the four-wire measurement circuits.
Service
Do not install substitute parts or perform any unauthorized modifi-
cations to this instrument.
The SIM922 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)
SIM922 Diode Temperature Monitor
General Information v
Notation
The following notation will be used throughout this manual:
•Front-panel buttons are set as [Button];
[Adjust ] is shorthand for “[Adjust ] & [Adjust ]”.
•Front-panel indicators are set as Overload.
•Remote command names are set as *IDN?.
•Literal text other than command names is set as OFF.
SIM922 Diode Temperature Monitor
vi General Information
Specifications
Performance Characteristics
Min Typ Max Units
Inputs Number of inputs 4
Sensor type Silicon diode
Measurement type 4–wire
Excitation constant current
9.999 10 10.001 µA DC,
±5 ppm/◦C
Sensor Characteristics Sensor units Volts
Input Range 0 2.5 V
sensor+lead resistance 1400 Ω
Calibration curves 1 built-in
4 user defined curves
Curve size (each) 256 points
Temperature range 1.4 475 K (typical)
sensor dependent
Measurement Display resolution 4 digits
Interface resolution 1 µV
1 mK
Measurement resolution 1.2 µV rms
Measurement accuracy, (23 ±1)◦C 20 µV+0.01 %
Temperature coefficient −5+5 ppm/◦C
Operating Temperature 0 40 ◦C
Power ±15,+5 V DC
Supply current 50 (±15 V), 250 (+5 V) mA
General Characteristics
Interface Serial (RS-232) through SIM interface
Connectors 2 DB–9 (female)
4–wire measurement +ground (Ch 1 & 2)
4–wire measurement +ground (Ch 3 & 4)
DB–15 (male) SIM interface
Weight 1.4 lbs
Dimensions 1.500 W×3.600 H×7.000 D
SIM922 Diode Temperature Monitor
1 Getting Started
This chapter gives you the necessary information to get started
quickly with the SIM922 Diode Temperature Monitor.
In This Chapter
1.1 Introduction to the Instrument . . . . . . . . . . . . . 1 – 2
1.1.1 Overview ..................... 1–2
1.2 Front-Panel Operation . . . . . . . . . . . . . . . . . . 1 – 2
1.2.1 Excitation ..................... 1–3
1.2.2 Units........................ 1–3
1.3 Sensor Interface . . . . . . . . . . . . . . . . . . . . . . 1 – 3
1.3.1 Four-wire measurement . . . . . . . . . . . . . 1 – 4
1.3.2 Two-wire measurement . . . . . . . . . . . . . 1 – 4
1.4 SIMInterface ....................... 1–5
1.4.1 SIM interface connector . . . . . . . . . . . . . 1 – 5
1.4.2 Direct interfacing . . . . . . . . . . . . . . . . . 1 – 5
1–1
1–2 Getting Started
1.1 Introduction to the Instrument
The SIM922 Diode Temperature Monitor monitors up to four (4)
silicon diode thermometers using a precision 10 µA DC current exci-
tation.
1.1.1 Overview
Each channel has an independent, precision 10 µA current source,
so the excitation to the user’s sensor remains steady as the SIM922
cycles between measurements. Disabling a channel switches that
channel’s current source off.
A precision 24–bit analog-to-digital converter is cycled between the
channels with a rate of 4 conversions per second. With all channels
enabled, a complete cycle is completed every second; disabling some
channels yields a corresponding increase in overall cycle rate.
1.2 Front-Panel Operation
The front panel of the SIM922(see Figure 1.1) provides a simple op-
erator interface.
Figure 1.1: The SIM922 front and rear panels.
SIM922 Diode Temperature Monitor
Indice
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