SRS Labs SIM922A Manuale operativo
Operation and Service Manual
Diode Temperature Monitor
SIM922A
Stanford Research Systems
Revision 1.3 •August 24, 2006
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., 2004, 2006. 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 9-01579-903
SIM922A 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 – 4
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 – 4
2.3 Introduction ........................ 2–6
2.4 Commands......................... 2–7
2.5 StatusModel........................ 2–19
i
ii Contents
SIM922A Diode Temperature Monitor
General Information
The SIM922A Diode Temperature Monitor, part of Stanford Research
Systems’ Small Instrumentation Modules family, consists of a single-
channel sensor excitation and readout for precision low-noise diode
thermometry. Front-panel analog outputs provide both a scaled (lin-
ear voltage proportional to temperature) and raw (buffered sensor
voltage) signal. The 10 µA DC current source provides sensor exci-
tation to the four-wire measurement circuit.
Service
Do not install substitute parts or perform any unauthorized modifi-
cations to this instrument.
The SIM922A 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)
SIM922A 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.
SIM922A Diode Temperature Monitor
vi General Information
Specifications
Performance Characteristics
Min Typ Max Units
Inputs Number of inputs 1
Sensor type Silicon, GaAs, or GaAlAs 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 -7.5 7.5 V
Calibration curves 1 built-in
1 user defined curve
Curve size (each) 1024 points
Temperature range 1.4 475 K (typical)
sensor dependent
Measurement Measurement Rate 5 readings per second
10 per second (autocal. off)
Display resolution 4 digits
Interface resolution 7 digits
Measurement resolution 4 µV rms
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 DB–9 (female)
4–wire measurement +ground
DB–15 (male) SIM interface
Weight 1.4 lbs
Dimensions 1.500 W×3.600 H×7.000 D
SIM922A Diode Temperature Monitor
1 Getting Started
This chapter gives you the necessary information to get started
quickly with the SIM922A 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
1.2.3 Setpoint ..................... 1–3
1.2.4 Scaled Output . . . . . . . . . . . . . . . . . . 1 – 4
1.3 Sensor Interface . . . . . . . . . . . . . . . . . . . . . 1 – 4
1.3.1 Four-wire measurement . . . . . . . . . . . . 1 – 4
1.3.2 Two-wire measurement . . . . . . . . . . . . 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 Getting Started
1.1 Introduction to the Instrument
The SIM922A Diode Temperature Monitor monitors up a diode ther-
mometer using a precision 10 µA DC current excitation. Analog
outputs, both proportional to temperature and the buffered sensor
voltage, are available on the front panel.
1.1.1 Overview
The SIM922A has a commandable, precision 10 µA current source,
Disabling the excitation switches offthe readout.
A precision 24–bit analog-to-digital converter alternates between
measuring the sensor voltage and an internal autocalibration cycle.
New sensor measurements are available at a rate of 5 conversions
per second.
1.2 Front-Panel Operation
The front panel of the SIM922A(see Figure 1.1) provides a simple
operator interface.
Figure 1.1: The SIM922A front and rear panels.
SIM922A Diode Temperature Monitor
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