Solartron 1250 Operating Manual Set
1250
1250
Frequency Response
Analyzer
OPERATING MANUAL
1250 Frequency Response Analyzer
1250
Solartron is a division of Solartron Group Ltd. Any reference to Schlumberger or
Schlumberger Instruments (the name of the company until November 1993) implies no
liability on the part of Schlumberger.
Solartron Solartron
Victoria Road, Farnborough 19408 Park Row, Suite 320
Hampshire, GU14 7PW England Houston, Texas 77084-4860, USA
Telephone: +44 (0)1252 376666 Telephone: +1 281 398 7890
Fax: +44 (0)1252 544981 Fax: +1 281 398 7891
Toll-free: 1-800 CALL SOL
Solartron Solartron
37 Rue du Saule Trapu Beijing Liasion Office
91882 MASSY, Cedex Room 327 Ya Mao Building
France No. 16, Bei Tu Chen Xi Road
Telephone: +33 (0)1 69 53 63 53 Beijing 100101, PR China
Fax: +33 (0)1 60 13 37 06 Telephone: +86 10-6238 4687
Fax: +86 10-6202-8617
E-mail: solartron@solartron.com
Web: http://www.solartron.com
For details of our agents in other countries, please contact our Farnborough, UK, office.
Solartron pursues a policy of continuous development and product improvement.
The specification in this document may therefore be changed without notice.
1250 Frequency Response Analyzer
1250
DECLARATION OF CONFORMITY
The directives covered by this declaration
73123/EEC Low voltage Equipment Directive, amended by 93/68/EEC
89/336/EEC Electromagnetic Compatibility Directive, amended by 92/31/EEC & 93/68/EEC
Product(s)
1250A Frequency Response Analyzer
The following products are included in this declaration:
1250B, 1250E and 1254 Frequency Response Analyzers;
12501A, 12502A, 12506A, 12506B, 12506C Option modules.
Basis on which conformity is being declared
The product(s) identified above comply with the requirements of the EU directives
by meeting the following standards:
BS EN50081-1:1992 Electromagnetic Compatibility - Generic Emission Standard
Part 1: Residential, commercial and light industry.
BS EN50082-1:1992 Electromagnetic Compatibility - Generic Immunity Standard
Part 1: Residential, commercial and light industry.
EN61010-1:1993 Safety requirements for electrical equipment for
measurement, control and laboratory use.
Accordingly the CE mark has been applied to this product.
Signed
For and behaIf of Solartron, a division of Solartron Group Limited
Authority: Engineering Manager
Date: December 1995
REGISTERED IN ENGLAND No.2852989. REGISTERED OFFICE: BYRON HOUSE,
CAMBRIDGE BUSINESS PARK, CAMBRIDGE, CB4 4WZ
Approved to BS EN ISO 9001:1994 and BS EN 123000, MOD Registered Company
A Roxboro Group company
Solartron
a division of Solartron Group Ltd
Victoria Road, Farnborough
Hampshire GUI4 7PW England
Tel +44 (0) 1252 376666
Fax +44 (0) 1252 543854
1250 Frequency Response Analyzer
1250
GENERAL SAFETY PRECAUTIONS
The equipment described in this manual has been designed in accordance with EN61010
“Safety requirements for electrical equipment for measurement, control and laboratory use”,
and has been supplied in a safe condition. To avoid injury to an operator or service
technician the safety precautions given below, and throughout the manual, must be strictly
adhered to, whenever the equipment is operated, serviced or repaired. For specific safety
details, please refer to the relevant sections within the manual.
The equipment is designed solely for electronic measurement and should be used for no
other purpose. Solartron Instruments accept no responsibility for accidents or damage
resulting from any failure to comply with these precautions.
ENVIRONMENT
This instrument must always be used within the environmental conditions (temperature,
humidity, vibration, etc.), given in the Specification.
GROUNDING
To minimize the hazard of electrical shock it is essential that the equipment is connected to
a protective ground whenever the power supply, measurement or control circuits are
connected, even if the equipment is switched off. The protective ground for ac and dc
supplies is connected separately.
AC GROUND is connected via the ac supply cord. The cord must be plugged into an ac line
outlet with a protective ground contact. When an extension lead is used, this must also
contain a ground conductor. Always connect the ac supply cord to the supply outlet before
connecting the control and signal cables; and, conversely, always disconnect control and
signal cables before disconnecting the ac supply cord. The ac ground connection must be
capable of carrying a current of 25A for a minimum of one minute.
AC SUPPLY VOLTAGE
Never operate the equipment from a line voltage or frequency in excess of that specified.
Otherwise, the insulation of internal components may break down and cause excessive
leakage currents.
FUSES
Before switching on the equipment check that the fuses accessible from the exterior of the
equipment are of the correct rating. The rating of the ac line fuse must be in accordance
with the voltage of the ac supply.
Should any fuse continually blow, do not insert a fuse of a higher rating. Switch the
equipment off, clearly label it “unserviceable” and inform a service technician.
EXPLOSIVE ATMOSPHERES
NEVER OPERATE the equipment, or any sensors connected to the equipment, in a
potentially explosive atmosphere. It is NOT intrinsically safe and could possibly cause an
explosion.
Continued overleaf.
1250 Frequency Response Analyzer
1250
SAFETY PRECAUTIONS (continued from previous page)
SAFETY SYMBOLS
For the guidance and protection of the user, the following safety symbols appear on the
equipment:
SYMBOL MEANING
Refer to operating manual for detailed instructions of use. In
particular, note the maximum voltages permissible at the input
sockets, as detailed in the Specification.
Hazardous voltages.
NOTES, CAUTIONS AND WARNINGS
For the guidance and protection of the user, Notes, Cautions and Warnings appear
throughout the manual. The significance of these is as follows:
NOTES highlight important information for the reader’s special attention.
CAUTIONS guide the reader in avoiding damage to the equipment.
WARNINGS guide the reader in avoiding a hazard that could cause injury or death.
AVOID UNSAFE EQUIPMENT
The equipment may be unsafe if any of the following statements apply:
• Equipment shows visible damage.
• Equipment has failed to perform an intended operation.
• Equipment has been subjected to prolonged storage under unfavorable conditions.
• Equipment has been subjected to severe physical stress.
If in any doubt as to the serviceability of the equipment, don’t use it. Get it properly checked
out by a qualified service technician.
LIVE CONDUCTORS
When the equipment is connected to its measurement inputs or supply, the opening of
covers or removal of parts could expose live conductors. The equipment must be
disconnected from all power and signal sources before it is opened for any adjustment,
replacement, maintenance or repair. Adjustments, maintenance or repair, must be done
only by qualified personnel, who should refer to the Maintenance Manual.
EQUIPMENT MODIFICATION
To avoid introducing safety hazards, never install non-standard parts in the equipment, or
make any unauthorized modification. To maintain safety, always return the equipment to
Solartron for service and repair.
1
Contents
Section Page
Chapter 1 General Information
1.1 Introduction 1.3
1.2 Basic measuring set-up 1.3
1.3 The instrument essentials 1.4
1.4 Additional facilities 1.5
1.5 1250 Variants 1.7
1.6 Options 1.8
Chapter 2 Installation
2.1 Safety 2.2
2.2 General Safety Precautions 2.2
2.2.1 Electromagnetic Compatibility 2.3
2.3 Connecting the ac mains 2.4
2.3.1 Safety precautions: Earthing 2.4
2.3.2 Procedure 2.4
2.4 Accessories 2.5
2.5 Rack Mounting 2.5
2.5.1 Rack Dimensions 2.6
2.5.2 Ventilation 2.6
2.5.3 Fitting Telescopic Slide Mounting Kit 12505B (Accuride) 2.6
2.5.4 Fitting Telescopic Slide Mounting Kit 12505C (Jonathan) 2.11
Chapter 3 Switching on and Initialising
3.1 Switch On 3.2
3.2 Initialising 3.3
3.3 Resetting 3.4
Chapter 4 Making Measurements: The Generator
4.1 Simple Measurements 4.2
4.2 Setting the Generator 4.2
4.2.1 Introduction 4.2
4.2.2 Setting the Generator Menu 4.2
4.2.3 Waveform 4.2
4.2.4 Frequency 4.3
4.2.5 Clear 4.4
4.2.6 Amplitude 4.4
4.2.7 Bias 4.4
4.2.8 Modulated Carrier 4.4
4.3 Checking Generator Settings: Using the Status Displays 4.4
4.4 Starting the Generator 4.5
4.4.1 Generator Start Key 4.5
4.4.2 Generator Waveform Starting Point 4.5
4.5 Rack Stopping the Generator 4.5
4.5.1 Introduction 4.5
4.5.2 Generator Stop Key 4.5
Contents 1250 Frequency Response Analyzer
2 1250
4.5.3 Generator Stop @ Key 4.6
4.5.4 Applications of the Stop @ Key 4.6
4.5.5 Generator Overload Protection 4.7
Chapter 5 Making Measurements: The Analyzers
5.1 Introduction 5.2
5.2 Setting the [ANALYZER COMMON] Menu 5.2
5.2.1 ∫ Time 5.2
5.2.2 Delay 5.3
5.2.3 Harmonic 5.3
5.2.4 Order 5.4
5.2.5 Auto ∫ 5.4
5.2.6 Application of Auto Integration 5.4
5.3 Setting Individual Analyzers 5.6
5.3.1 Range 5.6
5.3.2 Demod 5.6
5.3.3 Coupling 5.6
5.3.4 Input 5.6
5.4 Measurement Start 5.7
5.5 Stopping the Analyzer; Stop and Break Keys 5.8
5.6 Changing Menus during Recycle 5.8
5.7 Measurement Start Point 5.8
5.7.1 Implementation of Delay 5.8
Chapter 6 The Sweep Facility
6.1 Introduction 6.2
6.2 Logarithmic Sweep 6.2
6.3 Linear Sweep 6.2
6.4 Setting Up a Logarithmic or Linear Sweep 6.3
6.5 Executing the Sweep 6.3
6.6 Automatic Sweep Time 6.3
6.7 End of Sweep Conditions 6.4
6.8 Further Sweeps 6.4
6.9 Stopping and Re-staring the Sweep 6.4
6.9.1 Introduction 6.4
6.9.2 Commands Which Produce “Sweep Stop” Status 6.4
6.9.3 Commands Which Produce “Sweep Idle” or “Hold” Status 6.5
6.10 Changing Parameters in Mid-Sweep 6.5
6.11 Harmonic Sweep 6.5
6.11.1 Introduction 6.5
6.11.2 Perfoming a harmonic Sweep 6.6
6.11.3 Error 21 6.6
6.11.4 Sweep Termination Conditions 6.6
Chapter 7 The Display Menu and Mini Status
7.1 Introduction 7.2
7.2 Sources 7.3
7.3 Co-Ordinates 7.3
Chapter 8 Menu Summary
8.1 Introduction 8.2
Chapter 9 Additional Generator Controls
9.1 The Variable Key 9.2
9.1.1 Introduction 9.2
1250 Frequency Response Analyzer Contents
1250 3
9.1.2 Methods of Use 9.2
9.1.3 Method 1, With Analyzers Stopped 9.2
9.1.4 Method 2, With Analyzers Running 9.3
9.1.5 Using Variable with the Generator STOP @ Key 9.4
9.2 Amplitude Compression 9.5
9.2.1 Introduction 9.5
9.2.2 Principle of Operation 9.5
9.2.3 Generator Output Limit 9.7
9.2.4 Setting the Menu 9.8
9.2.5 Error 84 9.8
9.2.6 Use of the File 9.8
Chapter 10 Facilities For More Complex Measurements
10.1 The Function Key 10.2
10.1.1 Introduction 10.2
10.1.2 Angle Information 10.3
10.1.3 Multiplication Factors: Xωn 10.4
10.1.4 Scaling 10.5
10.1.5 Limits 10.6
10.1.6 Function Key Summary 10.7
10.2 Data Flow Schematic 10.8
Chapter 11 Additional Displayed Information
11.1 The Status Key 11.2
11.1.1 Introduction 11.2
11.1.2 Using the Key 11.2
11.1.3 Main Status 11.3
11.1.4 Other Status 11.5
11.1.5 Printed Record 11.8
11.2 Error Codes 11.9
11.2.1 Introduction 11.9
11.2.2 Error Codes: Summary 11.9
11.3 Error Codes: Details 11.11
11.3.1 Introduction 11.11
11.3.2 Group 0. Errors Pertaining to Command Structure 11.11
11.3.3 Group 1. Errors Pertaining to the Learnt Program 11.12
11.3.4 Group 2. Parametric Interaction Errors. 11.12
11.3.5 Group 3. Generator Warnings and Errors 11.12
11.3.6 Group 4. Learnt Program, File and Variable 11.13
11.3.7 Group 5. Missing Boards 11.13
11.3.8 Group 6. Illegal I/O Manipulation 11.14
11.3.9 Group 7. System Errors 11.14
11.3.10 Group 8. Measurement Validity is Suspect 11.14
Chapter 12 Recording, Learning and Storing Facilities
12.1 The Data Output Key 12.2
12.1.1 Introduction 12.2
12.1.2 [DATA OUTPUT] 12.2
12.1.3 [FORMAT]: Heading and Reformat 12.3
12.1.4 Heading 12.3
12.1.5 Reformat 12.4
12.1.6 Menu Changes Activating the Heading and Reformat Functions 12.5
12.1.7 Channel and Range Column Conventions 12.5
12.1.8 [GPIB CONFIGURE] 12.6
12.1.9 Parallel and Poll Sense 12.6
12.1.10 Serial Poll 12.6
Contents 1250 Frequency Response Analyzer
4 1250
12.1.11 Terminator and Separator 12.6
12.2 The File 12.7
12.2.1 Introduction 12.7
12.2.2 Maximum File Size 12.7
12.2.3 Selecting File Size 12.7
12.2.4 Overwriting the Size of the File 12.7
12.2.5 Starting a File 12.8
12.2.6 Reading from the File 12.8
12.3 Learnt Programs 12.9
12.3.1 Introduction 12.9
12.3.2 Learning a Program: From the Front Panel 12.9
12.3.3 Learning a Program: From an External Device 12.10
12.3.4 Executing a Program 12.11
12.3.5 Editing a Program: From the Front Panel 12.11
12.3.6 Editing a Program: From an External Device 12.12
12.3.7 Copying a Program 12.12
12.3.8 Program Pause/Continue Key 12.13
12.3.9 Example Programs 12.13
12.3.10 Error Messages Displayed During Program Running 12.13
12.4 X - Y Plotter 12.14
12.4.1 Introduction 12.14
12.4.2 Setting up a Plot: Non-Plotter Menus 12.14
12.4.3 The [PLOTTER COMMON] menu 12.15
12.4.4 The [PLOTTER X-AXIS] and [PLOTTER Y-AXIS] menus 12.16
12.4.5 The [PLOTTER SCALING] menu 12.17
12.4.6 Performing a Plot 12.18
12.4.7 Bode and Nyquist Plots 12.19
12.4.8 Adjusting the Plotting Field to suit Preprinyed Chart Paper 12.20
12.4.9 Pen Selection with two Pen Plotters 12.21
12.4.10 Plotting Data from the File 12.21
Chapter 13 The RS423 and GPIB Ports. Remote Control
13.1 Introduction 13.3
13.1.1 GPIB Capacity Code 13.3
13.2 Connections 13.4
13.3 RS423 Baud Rate 13.4
13.4 RS423 Input Command Terminator Character; RS423 Character
Frame 13.4
13.5 GPIB Switches 13.5
13.5.1 Address switches 13.6
13.5.2 Input Command Terminator Character Switches 13.6
13.5.3 Talk Only Switch 13.6
13.5.4 GPIB Switch Example 13.6
13.6 REMOTE/LOCAL Facility 13.7
13.6.1 Local Lock-Out 13.8
13.7 Command Codes 13.9
13.7.1 Introduction 13.9
13.7.2 Command Code Format 13.9
13.7.3 Generator Commands 13.10
13.7.4 Synchroniser Commands 13.10
13.7.5 Amplitude Compression Commands 13.11
13.7.6 Auxiliary Generator Commands 13.11
13.7.7 Analyzer Commands 13.11
13.7.8 Sweep Commands 13.12
13.7.9 Display Commands 13.12
1250 Frequency Response Analyzer Contents
1250 5
13.7.10 Plotter Commands 13.12
13.7.11 Status Commands 13.13
13.7.12 Variable Commands 13.13
13.7.13 File Commands 13.13
13.7.14 Program Commands 13.14
13.7.15 Data Output Commands 13.14
13.7.16 RS423/GPIB Commands 13.14
13.7.17 Function Commands 13.15
13.7.18 Miscellaneous Commands 13.15
13.7.19 Self Test Commands 13.16
13.7.20 Commands in Alphabetical Order 13.16
13.8 GPIB Controller: Language Used in Program Examples 13.19
13.9 Command Query 13.19
13.10 Measurement Output Selection 13.20
13.10.1 Via RS423 Port 13.20
13.10.2 Via GPIB Interface 13.21
13.11 Measurement Output Rate 13.21
13.11.1 Via RS423 Port 13.21
13.11.2 Via GPIB Interface 13.21
13.12 Measurement Output Format 13.21
13.12.1 RS423 Port 13.21
13.12.2 GPIB Talk Only Mode 13.21
13.12.3 GPIB Normal Mode 13.22
13.12.4 Dump Mode 13.23
13.12.5 Floating Point Format 13.23
13.12.6 Output Terminators and Separators 13.24
13.13 Serial Poll/Parallel Poll 13.25
13.13.1 Serial Poll 13.25
13.13.2 Parallel Poll 13.26
13.14 Learnt Programs. External Storing and Reloading 13.27
13.14.1 RS423 Port, Device Control Characters 13.27
13.14.2 Procedure for Storing a Learnt Program Externally, via RS423 13.28
13.14.3 Procedure of Loading a Learnt Program into the 1250,
Via RS423 Port 13.28
13.14.4 Procedure of Loading a Learnt Program into the 1250,
Via GPIB Port 13.28
13.14.5 Example of Controller Program for Transferrring Learnt program 1
from 1250 via GPIB Port, Without Handshake 13.29
13.14.6 Example of Controller Program for Transferrring Learnt program 1
from 1250 via GPIB Port, With Handshake 13.29
13.14.7 Reloading a Learnt Program to 1250 Via GPIB 13.29
13.15 File Output 13.30
13.15.1 Procedure to Outputt File Via RS423 Port by External Command 13.30
13.15.2 Procedure to Output the File Via GPIB Port 13.30
13.15.3 Example of Controller program for Copying the File to the GPIB
Without Handshake 13.31
13.15.4 Example of Controller program for Copying the File to the GPIB
With Handshake 13.31
13.16 GPIB Plotting 13.31
13.16.1 Operating Sequence for GPIB Plotter, Using a Controller 13.32
13.17 Combinations of RS423 and GPIB Devices 13.32
Chapter 14 Break, Self Test, Time Display and Power Fail
14.1 The Break Key 14.2
14.2 Self Test 14.2
14.3 Time Display 14.4
Contents 1250 Frequency Response Analyzer
6 1250
14.4 Power Fail 14.5
Chapter 15 Options
15.1 Synchroniser Unit 12501 15.2
15.1.1 Introduction 15.2
15.1.2 Description 15.2
15.1.3 Installation 15.2
15.1.4 Connecting Up 15.2
15.1.5 Modes of Operation 15.3
15.1.6 The Synchroniser Menu 15.5
15.1.7 Procedure for Establishing the Sync. Locked State 15.8
15.1.8 Synchroniser Status 15.9
15.1.9 Measuring Harmonics: Use of Order Analysis 15.11
15.2 Modulator/Demodulator Unit 12502 15.12
15.2.1 Introduction 15.12
15.2.2 Installation 15.12
15.2.3 Connections 15.12
15.2.4 Setting Up 15.12
15.3 Analog Plotter Interface 12503 15.13
15.2.1 Introduction 15.13
15.2.2 Installation 15.13
15.2.3 Preset Controls 15.14
15.2.4 Setting Up and Performing a Plot 15.14
15.4 Auxiliary generator Unit 12505 15.15
15.4.1 Introduction 15.15
15.4.2 Description 15.15
15.4.3 Installation 15.15
15.4.4 Setting Up 15.16
Chapter 16 The 1251 Multichannel Analyzer System
16.1 Introduction 16.2
16.2 Description 16.2
16.3 System Configuration 16.2
16.3.1 1250-1251 Interface Bus 16.2
16.3.2 IEEE 488 Interface Bus 16.2
16.3.3 1250 Series Options 16.2
16.4 Connecting Up 16.4
16.4.1 Safety: Connecting the ac Mains 16.4
16.4.2 Connecting up the 1250-1251 Interface Bus 16.4
16.5 1251 Unit Identification Switches 16.5
16.5.1 Analyzer Channel Numbering 16.5
16.6 Manual Operation of the System 16.5
16.6.1 Introduction 16.5
16.6.2 Manual Setting up of the 1251 System 16.5
16.6.3 Setting up the 1251 Analyzers 16.6
16.6.4 Displaying and Plotting data from the 1251 Analyzers 16.6
16.6.5 Checking the Analyzer and Display/Plotter Menu Settings 16.7
16.7 Remote Operation of the System 16.7
16.7.1 Introduction 16.7
16.7.2 GPIB Capability Code 16.7
16.7.3 Setting up the GPIB Configure Menu 16.8
16.7.4 Data Transfer Speeds 16.8
16.7.5 GPIB Output Buffers 16.8
16.7.6 GPIB Addresses 16.9
16.7.7 1251 Multichannel Analyzer Output: Complete Block Format 16.9
16.7.8 ASII Format 16.9
1250 Frequency Response Analyzer Contents
1250 7
16.7.9 Dump Mode Format 16.10
16.8 1251 Multichannel Analyzer Specification 16.11
Chapter 17 Specification
Index
CWB / 1260_Op / Issue 9 1-1
1
General Information
Section Page
1.1 Introduction 1.3
1.2 Basic measuring set-up 1.3
1.3 The instrument essentials 1.4
1.4 Additional facilities 1.5
1.5 1250 variants 1.7
1.6 Options 1.8
General Information 1250 Frequency Response Analyzer
1-2 CWB / 1250_Op / Issue 9
1250 Frequency Response Analyzer Menu Terms
CWB / 1250_Op / Issue 9 1-3
1.1 INTRODUCTION
The 1250 Frequency Response Analyzer measures the gain and phase characteristics
of the system under test, when stimulated by a known sinusoid. Ease of use is provided
by the touch-sensitive front panel keys. Many advanced features are incorporated,
making full use of microprocessor technology.
Standard interfaces allow full remote control. Readings can be stored for future
processing or fed to external recording devices. The instrument can be either freestanding or rack-mounted. Diagrams showing the front and rear panels are shown at the
end of this Chapter.
Figure 1.1 - 1250 Frequency Response Analyzer
1.2 BASIC MEASURING SET-UP
Figure 1.2 - Basic Measuring Set-up
General Information 1250 Frequency Response Analyzer
1-4 CWB / 1250_Op / Issue 9
1.3 THE INSTRUMENT ESSENTIALS
The three main sections of the 1250 are:
1. A Generator which produces a sinusoidal, square, or triangular-wave electrical
stimulus for the system on test.
2. Two analyzers which measure the response to the stimulus at two points in the
system, enabling either of the following to be calculated and displayed:
a) Single Point measurements (i.e., the absolute voltage of either Channel, and its
phase with respect to the Generator) as shown in Fig. 1.3:
Figure 1.3 - Single Point Measurements
b) Point-to-Point measurements (e.g., the response of Ch.2 with respect to Ch.1, in
terms of gain and phase shift) as shown in Fig. 1.4:
Figure 1.4 - Point-to-Point Measurements
1250 Frequency Response Analyzer Menu Terms
CWB / 1250_Op / Issue 9 1-5
3. The Display, (which is not fitted to 1250B), shows the results of the measurements in
any one of the following co-ordinate systems:
a. Cartesian (a, jb)
b. Polar (r, θ )
c. Log Polar (log r, θ )
The results may also be stored within the instrument for further processing. Additionally,
results may be passed to a plotter or computer.
1.4 ADDITIONAL FACILITIES
These are shown in Fig. 1.5
Figure 1.5 - 1250 Block Schematic
General Information 1250 Frequency Response Analyzer
1-6 CWB / 1250_Op / Issue 9
Keyboard. The keyboard on the front panel uses membrane switches and consists of a
number of function keys, used in conjunction with a numeric keypad. (See Fig. 1.7).
The function keys are known as `hard` keys in order to distinguish them from the five
keys immediately below the display which are called `soft` keys. Each hard key is
dedicated to one specific task, whereas the soft keys have many different roles assigned
to them, according to which hard key has just been operated. These roles are identified
by titles which appear in the display immediately above the relevant soft key.
For example, the major programmable sections of the 1250 are each controlled by a
menu. If the GENERATOR MENU key is pressed, the lower half of the display will
assign titles to the five soft keys as shown in Fig. 1.6:
Figure 1.6 - Softkey titles
Display. The display is a vacuum fluorescent alpha numeric type, each character being
formed on a 7 x 5 dot matrix. There are two rows of forty characters each.
Keyswitch. The keyswitch on the rear panel of the 1250 enables/disables writing to the
permanent memory, when switched to Supervisor/Normal respectively. The keyswitch
is a three position switch, with the Operator position reserved for future use.
GPIB Interface. Permits any device conforming to IEEE 488 (1978) to be connected,
e.g., a digital plotter to display results or a computer to process them.
Serial Interface. Enables most EIA RS232C and RS423 compatible peripherals to be
connected.
Control and Computation. This section controls the functioning of the whole
instrument and computes the results of the measurements. All the functions are under
microprocessor control and the entire instrument is run synchronously to preserve the
highest possible accuracy and repeatability of results. There are stores to hold previous
readings, parameter settings, and a number of learnt programs.
1250 Frequency Response Analyzer Menu Terms
CWB / 1250_Op / Issue 9 1-7
1.5 1250 VARIANTS
The 1250 is available in several versions, as shown in the table:
Model Number of
Channels
Front Panel
control
Compliant with
European EMC
Regulations
Notes
1250A 2 Yes No
1250B 2 No Yes
1250E 2 Yes Yes
1250N 2 Yes No Low impedance
generator output
1254A 4 Yes Yes
1251A Multiple n/a No Multi-channel
extension for
1250
General Information 1250 Frequency Response Analyzer
1-8 CWB / 1250_Op / Issue 9
1.6 OPTIONS
All these are controllable from the 1250 Keyboard, as are the GPIB and Serial Interface.
1. Synchroniser (12501A)*: enables the 1250 to be synchronised to an external
source.
2. Modulator/Demodulator (1250A): enables the 1250 to be directly interfaced with
systems that require ac carrier inputs, or which produce ac carrier outputs.
3. Plotter Interface (12503A)*: enables the 1250 to plot the measured results on an
analog plotter. A digital plotter may be driven from the GPIB.
4. Auxiliary Generator*: an additional generator, synchronised to the main generator
but producing a signal in quadrature with it. If required, however, the two generators
can be in phase. Three variants of the Auxiliary Generator are available:
Cosine (Quadrature) - 12506A
Sine (In phase) - 12506B
Antiphase - 12506C
* - these options are not available with the 1250N. In the manual, any references to the
options are not therefore applicable to 1250N.
1250A, B and E can be fitted with up to three options, plus one auxiliary generator.
1254A can only be fitted with any one of the available options, and cannot use an
auxiliary generator.
With the exception of the 12503A (which is no longer available in Europe), all the
options are compliant with European EMC standards. Therefore 1250B, 1250E and
1250A remain compliant when fitted with these options.
CWB / 1260_Op / Issue 9 1-9
Figure 1.7 - 1250E Front Panel
Alpha-numeric display
Front Input connections
(not available on 1250E, 1250B or 1254A)
Soft keys
Power switch
SI1250
FREQUENCY RESPONSE ANALYZER
POWER
OFF ON
STOP
STOP
@
START
MENU
STOP SINGLE RECYCLE
MENU
STOP HOLD
START/
CONTINUE
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General Information 1250 Frequency Response Analyzer
1-10 CWB / 1250_Op / Issue 9
Note: The rear panel shown is for 1250E or 1250B. Other versions of 1250 may have a slightly different appearance.
Figure 1.8 - Rear panel layout
1250 Frequency Response Analyzer Installation
CWB / 1250_Op / Issue 9A 2-1
2
Installation
Section Page
2.1 Safety 2.2
2.2 General Safety Precautions 2.2
2.2.1 Electromagnetic Compatibility 2.3
2.3 Connecting the ac mains 2.4
2.3.1 Safety precautions: Earthing 2.4
2.3.2 Procedure 2.4
2.4 Accessories 2.5
2.5 Rack Mounting 2.5
2.5.1 Rack Dimensions 2.6
2.5.2 Ventilation 2.6
2.5.3 Fitting Telescopic Slide Mounting Kit 12505B (Accuride) 2.6
2.5.4 Fitting Telescopic Slide Mounting Kit 12505C (Jonathan) 2.11
Installation 1250 Frequency Response Analyzer
2-2 CWB / 1250_Op / Issue 9A
2.1 SAFETY
The 1250 has been designed in accordance with EN61010, "Safety requirements for
electrical equipment for measurement, control and laboratory use", and has been
supplied in a safe condition. This operating manual contains information and warnings
which must be followed by the user to ensure safe operation and to retain the equipment
in a safe condition.
The operating instructions include safety precautions where appropriate, but the
principal ones are also listed below.
2.2 GENERAL SAFETY PRECAUTIONS
1. Before switching on, ensure that the mains lead is connected to the ac supply in
accordance with the colour code.
2. Ensure that the mains voltage selector is correctly set.
3. Ensure that the mains plug is connected only to a mains outlet which has a protective
earth contact. This applies equally if an extension lead is used; the lead must
contain an earth conductor.
4. To effect earthing, the mains plug must be inserted before connections are made to
measuring and control circuits. The mains plug or external earth (as appropriate)
must remain connected until all measuring and control circuits have been
disconnected.
5. Any interruption of the earth connection (inside or outside the 1250) is prohibited.
6. When the 1250 is connected to its supply the opening of covers or removal of parts
could expose live conductors. The 1250 should be disconnected from all voltage
sources before it is opened for any adjustment, replacement, maintenance or repair.
Adjustments, maintenance or repair of the 1250 when it is powered should not be
attempted by the user. Consult a Solartron Service Centre if repairs are necessary.
7. Ensure that only fuses of the correct rating and of the specified type are fitted.
Makeshift fuses and short-circuiting of fuseholders is prohibited.
8. Whenever it is likely that the protection of the 1250 has been impaired, it should be
made inoperative and secured against any unintended operation. Protection could be
impaired if the 1250:
i) shows visible damage;
ii) has not been used as specified;
iii) has been operated outside the stated temperature range;
iv) fails to perform the intended measurements;
v) has been subjected to prolonged storage under unfavourable conditions;
vi) has been subjected to severe transport stress.
9. This symbol on the 1250 means 'Refer to the Operating Manual' for detailed
instructions or safety precautions.
In particular, care must be taken not to apply voltages in excess of the maximums
specified for each input and output. A summary of these is listed in the table below:
1250 Frequency Response Analyzer Installation
CWB / 1250_Op / Issue 9A 2-3
Input / Output Maximum Voltage
Generator outputs 150V, HI or LO to Gnd
Channel inputs 500 V, HI or LO to Gnd
Auxiliary Generator output 150V, HI or LO to Gnd
Modulator/Demodulator carrier inputs 350V peak, 250V rms, HI or LO to Gnd
Synchroniser input 350V peak, 250V rms, HI or LO to Gnd
Generator Stop inputs +7V to Gnd
2.2.1 Electromagnetic Compatibility
When used as described in this manual the 1250B, 1250E and 1254A models meet the
requirements of the EMC Directive, (see Specification in Chapter 17). The 1250 must
not be operated with the inner metal screens removed and any replacement
components must be of the correct type.
When conducting tests where there is a radio-frequency common mode voltage present,
it is strongly recommended that the Synchroniser, Carrier 1 and Carrier 2 inputs use the
differential connection, that is, with both HI and LO connections connected to their
respective sources by screened cables. In this way the signal leads will be screened by
a ground which originates at the 1250 and continues to the signal source.
Data cables connected to the Serial, GPIB and Interface B connectors should have a
braided outer screen, which should be grounded.
Installation 1250 Frequency Response Analyzer
2-4 CWB / 1250_Op / Issue 9A
2.3 CONNECTING THE AC MAINS
2.3.1 SAFETY PRECAUTIONS: EARTHING
For reasons of safety an earth connection is essential whenever measurement and
control circuits are connected, even if the 1250 is switched off. Earthing is achieved by
connecting the 1250 to a mains outlet, or other suitable earthing point. This earth
should be capable of carrying 25A and conform to the regulations in 'British Standard
Code of Practice CP1013 1965. Earthing'.
2.3.2 PROCEDURE
The 1250 is powered from 115V or 23OV ac mains. Before connecting the supply:
1. Ensure that the mains voltage selector switch on the rear panel is set at 115V or
230V as appropriate. Also on the rear panel, check that the mains fuse rating is
correct: 2A SLO BLO for 115V. 1A SLO BLO for 230V.
2. Ensure that the Power On/Off switch in the bottom left-hand corner of the Front
Panel is Off.
3. Connect the mains lead.
An ac supply cable, complete with a mating connector socket for the IEC plug on the
1250, is supplied. This cable should be connected to the user's ac supply in accordance
with the following colour code:
BROWN : LINE
BLUE : NEUTRAL
GREEN/YELLOW : EARTH
If the user already has available a supply cable terminated with an IEC socket, then this
can be plugged directly into ac supply plug on the 1250. It should be ensured. however,
that the socket is correctly wired, as shown in Fig. 2. 1.
Figure 2.1 - IEC power socket connections
4. Press the Power switch to On.
1250 Frequency Response Analyzer Installation
CWB / 1250_Op / Issue 9A 2-5
2.4 ACCESSORIES
The 1250 accessories are supplied in a polythene bag packed with the instrument. The
accessory bag should contain:
a. 1 fuse, 1A SLO BLO, for 240V ac supply
b. 1 fuse. 2A SLO BLO, for 115V ac supply
c. 2 rack mounting brackets ("ears")
d. 1 slide mounting bar, part no. 12502024B, for telescopic slide rack mounting
e. 4 screws, M4 X 12 countersunk, to fix item d
f. 3 cable assemblies, terminated for front panel connections
An appropriate ac mains cable is packed with the instrument. If ordered with the 1250, a
telescopic rack slide mounting kit (Option 12505B, or 12505C for U.S.A.) is also packed.
2.5 RACK MOUNTING
The 1250 can be rack mounted in two ways: either by using fixed rails in the rack to
support the underside of the case, or by using telescopic slides to support the 1250 and
allow easy withdrawal for servicing.
With either method, the pair of rack mounting cars included in the accessory kit is
substituted for the finisher trims on the 1250; screws inserted through the ears and into
the rack keep the unit in place.
Note 1: The rack mounting ears must be used only to prevent the 1250 sliding out of the
rack. They are not designed to support the whole weight of the instrument.
Note 2: When the 1250 is rack mounted on telescopic slides, ensure that the rack will
not tip over when the slides are fully extended.
Two slide mounting kits are available as optional accessories:
1. kit 12505B (Accuride; UK), containing:
a. 1 telescopic slide kit, plus fixings
b. 14 screws, M4 X 6 panhead, to fix slide inner members to the mounting bars
c. 14 washers, M4 crinkle
d. 4 screws, M6 satin chrome, to fix front panel to rack
e. 4 washers. M6 plain
f. 4 caged nuts, M6, to fix front panel to rack
This kit is suitable only for 30 ins deep IMHOF IMRAK Series 80 or dimensionally similar
cabinets.
2. kit 12505C (Jonathan; USA), containing:
a. 1 replacement case top, part no. 12500241A
b. 1 replacement case bottom, part no. 12500242A
c. 4 feet, self-adhesive, to support pcb's inside item b
Jonathan slides and fixings are not supplied by Solartron.
Installation 1250 Frequency Response Analyzer
2-6 CWB / 1250_Op / Issue 9A
2.5.1 RACK DIMENSIONS
The internal rack dimensions required for fitting the 1250 are:
610mm (24 ins) deep X 485mm (19 ins) wide for fixed rail mounting, and
760mm (30 ins) deep X 485mm (19 ins) wide for telescopic slide mounting (using either
kit)
2.5.2 VENTILATION
Ensure that the rack in which a 1250 is mounted has adequate ventilation, either by an
extractor fan or by having the rear of the rack open.
2.5.3 FITTING TELESCOPIC SLIDE MOUNTING KIT 12505B (ACCURIDE)
1. Remove the following items from the unit, as shown in Fig. 2.2:
a. Finisher Trim (two off)
Retain the four M4 x 16 panhead screws and M4 crinkle washers for securing the
rack ears.
b. Handle and Handle Trim
c. Side Trim
Located on the opposite side to the handle, it is normally secured by a pip on the
finisher trim, and slides out backwards.
d. Feet (four off) and Tilt Bar
The tilt bar is secured by the two front feet.
Figure 2.2 - Removal of trims, handle, feet, and tilt bar
1250 Frequency Response Analyzer Installation
CWB / 1250_Op / Issue 9A 2-7
2. Fit the following items to the unit, as shown in Fig. 2.3:
a. Rack Ears (two off)
Fit the rack ears in place of the finisher trim, using the same fixings.
The ears may he fitted as illustrated, or with their flanges facing the rear of the
1250, which causes the unit to stand out further in the rack, allowing use of racks
too shallow for normal mounting.
b. Slide Mounting Bar
Screw the bar to the chassis in the former position of the handle, using the four
M4x12 csk screws provided. The bar fits correctly only one way round, with
threaded holes nearest the front.
The corresponding mounting bar on the left-hand side of the unit is supplied
already fitted behind the side trim (part no. 12502019B), it is slightly narrower than
the right-hand bar.
Figure 2.3 - Fitting rack ears and telescopic slide inner members
Installation 1250 Frequency Response Analyzer
2-8 CWB / 1250_Op / Issue 9A
c. Telescopic Slide Inner Members (two off)
The telescopic slides are supplied with inner and outer members, slotted
together. Slide out the inner member as shown in Fig. 2.4. depressing the
locking catch at the halfway point.
Figure 2.4 - Separating the inner and outer slide members, prior to fixing
Screw the slide inner members to the mounting bars, using the fourteen M4X6
panhead screws supplied, seven each side.
3. Fit the following items to the telescopic slide outer members, as shown in Fig. 2.5
and 2.6:
c. Adjustable Rear Brackets (two off)
Fit one rear bracket to each outer member, but do not fully tighten the screws
until the 1250 is fitted into the rack (step 6).
Figure 2.5 - Fitting a rear bracket
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