Ectron 451 Manuale utente
INSTRUCTION MANUAL
MODEL 451
LVDT AND RVDT
SIGNAL CONDITIONER
The information contained in this manual is proprietary. Permission to reproduce all or
part must first be obtained in writing from this company.
Ectron Corporation reserves the right to make specification changes at any time.
LIFE-SUPPORT POLICY: Ectron products are not authorized for use in life-support
devices or systems without the express, written approval of the President of
Ectron Corporation.
Copyright 1998, revised October, 2009 Ectron Corporation
Ectron Corporation 8159 Engineer Road
All rights reserved San Diego, CA 92111-1980
858-278-0600
858-732-8159
Fax: 858-278-0372
www.ectron.com
All Ectron instruments are warranted against defects in material and workmanship for one year
from the date of shipment to the original purchaser. Ectron agrees to repair or replace any
assembly or components (except expendable items such as fuses, lamps, batteries, etc.) found to
be defective during this period. Ectron's obligation under this warranty is limited solely to
repairing or replacing, at its option, an instrument that in Ectron's sole opinion proves to be
defective within the scope of the warranty when returned to the factory or to an authorized
service center. Transportation to the factory or service center is to be prepaid by the purchaser.
Shipment should not be made without the prior authorization of Ectron. This warranty does not
apply to products repaired or altered by persons not authorized by Ectron, or not in accordance
with instructions furnished by Ectron. If the instrument is defective as a result of misuse,
improper repair, alteration, neglect, or abnormal conditions of operation repairs will be billed at
Ectron's normal rates. Ectron assumes no liability for secondary charges of consequential
damages as a result of an alleged breach of this warranty; and in any event, Ectron's liability for
breach of warranty under any contract or otherwise shall not exceed the purchase price of the
specific instrument shipped and against which a claim is made. This warranty is in lieu of all
other warranties, expressed or implied; and no representative or person is authorized to represent
or assume for Ectron any liability in connections with the sale of our products other than is set
forth herein.
If a fault develops, notify Ectron or its local representative, giving full details of the difficulty.
Include the model and serial numbers. On receipt of this information, a service date or shipping
instructions will be furnished. If shipment is indicated, forward the instrument, freight prepaid,
to the factory or to the authorized service center indicated in the instructions.
Instruments should be tested upon receipt. If there is any damage, a claim should be filed with
the carrier. A full report of the damage should be obtained by the claim agent, and that report
should be forwarded to Ectron. Ectron will advise the disposition to be made of the equipment
and arrange for repair or replacement. Please include model and serial numbers in all
correspondence.
GENERAL
PROCEDURE FOR SERVICE
DAMAGE IN TRANSIT
®
TABLE OF CONTENTS
PAGE
Warranty
Inside Front Cover
Section I, Description
General 1-1
Modes of Operation 1-1
Other Features 1-2
Enclosures 1-2
About This Manual 1-2
Section II, Specifications
Input 2-1
Dynamic Response 2-1
Output 2-1
Excitation 2-1
Input Power 2-1
Calibration and Alignment 2-1
Environment 2-2
Physical Parameters 2-2
Compatibility 2-2
Notes 2-2
Section III, Operation
General 3-1
View Angle 3-1
Connections and Enclosures 3-1
Controls 3-2
Updating Memory 3-3
Time Out 3-3
Power On 3-3
Operating Screens 3-3
Operation Scheme and Main Menu 3-4
First Screen 3-4
Gain-mode Setup 3-5
Example-mode Setup 3-5
Scale-mode Setup 3-7
Autozero 3-8
Zero Setup 3-9
i
Filter Setup 3-9
Cal 3-9
Other 3-10
Secondary Menu 3-10
Excitation Setup 3-10
Units of Measure 3-11
Reset System 3-12
Align 3-12
System Info 3-12
Other Exit 3-12
ENCLOSURES
Model R418-7 3-13
Models 4001 and 4005 3-14
Model E408-6 3-16
Model R408-14 3-17
Section IV, Applications
General 4-1
Selecting the Operation Mode to Use 4-3
Determining the Active Mode 4-4
Crosstalk 4-5
Output Noise 4-5
Phase Control 4-5
Ground Connections 4-5
Emi Protection 4-6
Vehicle Applications 4-6
Response Time 4-6
Update Rate 4-7
Output Polarity 4-7
Null Improvement 4-7
Section V, Theory of Operation
Analog Input 5-1
Firmware 5-1
Gain Mode 5-1
Scale Mode 5-2
Example Mode 5-2
Calibration 5-2
PAGE
Table of Contents
Model 451
ii
Section VI, Alignment
General 6-1
Equipment Required 6-1
Procedures 6-1
Output Alignment 6-1
Input Alignment 6-3
Section VII, Parts Lists
Names of Manufacturers 7-1
Model E408-6 Enclosure 7-2
Model R408-14 Enclosure 7-3
Model R418-7 Series Enclosure 7-4
Model R418-M1028C Enclosure 7-5
Figures
Model 451 1-1
Figure 3-1, Typical LVDT Connection to the Model 451 3-2
Figure 3-2, Main Menu 3-4
Figure 3-3, Secondary Menu 3-11
Figure 4-5, Typical Output Filter 4-5
Figure 6-1, Output Alignment 6-2
Figure 6-2, Input Alignment 6-3
Tables
Table 3-1, Connections 3-1
Table 3-2, Transducer Sensitivity Ranges
(mV/V/Unit of Displacement) 3-5
Table 3-3, Adapting Ectron Enclosures for
Model 451 Operation 3-13
Table 3-14, Model R418-7 14-Channel Enclosures 3-14
Table 7-1, List of Manufacturers 7-1
Schematics and Drawings
Model E408-6Y (Internal-12-V-dc Power Supply) 408-600
Model E408-6X (Internal-28-V-dc Power Supply) 408-601
Model R408-14Y (Internal 12-V-dc Power Supply 408-605
Model R408-14X (Internal 28-V-dc Power Supply 408-606
Model R418-7 Series Rack-mount Enclosure 418-627
Model R418-7-M1028C Rack-mount Enclosure 419-605
Model 451 Outline Dimensions 451-900
Model 451 Operational State Diagram
PAGE
Model 451
Table of Contents
iii
Table of Contents
Model 451
iv
Section I
Description
GENERAL
The Model 451 LVDT signal-con-
ditioner produces an analog volt-
age that represents the
displacement of the shaft of an
LVDT (linear variable displace-
ment transformer). This voltage
and the displacement, in either
milli-inches, millimeters, or de-
grees, are displayed on a backlit
front-panel display. There are three
independent modes of operation
making it the most versatile LVDT-
signal conditioner produced today.
MODES OF OPERATION
The Model 451 is always in one
of three modes of operation:
GAIN
,
EXAMPLE
, or
SCALE
.
To activate an inactive mode, the
user simply dials the the knob until
the desired mode is displayed and
answers
YES
to a screen prompt.
The unit then guides the user
through the setup for that particular
mode.
In the
GAIN
mode, the desired
gain of the Model 451 and the
transducer sensitivity are entered,
and it is ready for use.
In the
EXAMPLE
mode, the user places the shaft of the LVDT at a position and “captures”
that point and assigns a voltage to it. This is done a second time for another position, and
after the transducer sensitivity is entered, the unit is ready for use.
In the
SCALE
mode, the user keys in two desired displacement points and corresponding
voltage points, and like the other two modes, after the transducer sensitivity is entered, the
unit is ready to use.
OTHER FEATURES
In addition to the mode of operation, the Model 451 offers complete control over a wide
variety of functions to truly make it unique.
Zero
Two means of controlling zero are provided: manual
and autozero. In manual zero, the user can dial in the
Model 451
LVDT Signal Conditioner
1-1
amount of offset desired and either view the amount of
offset or view the total offset (zero offset plus offset
due to input signal) at the output. When zero is “on,”
the user simply presses the display once to go directly
to autozero so that the unit can be quickly autozeroed.
If zero is not “on,” pressing the display once, turning
the encoder until autozero is displayed and pressing the
display again will turn zero on and initiate the autozero.
Filter
Four input-filter positions are provided to aid in eliminating
undesired signals. They are 1, 10, and 100 Hz in addition
to wideband (WB), which is approximately 300 Hz.
Cal
Both input (in terms of displacement) and output (in
terms of voltage) cals are provided.
Excitation
Two voltages and five frequencies are provided.
Units of Measure
Three units of measure are provided: milli-inches and
millimeters for linear measurements and degrees for ro-
tational measurements.
Alignment
Means to completely align the Model 451 are provided.
ENCLOSURES
Ectron manufactures several enclosures for its product line of ruggedized signal conditioners
and condtioner-amplifiers. These include the Models E408-6, R408-14, R418, 4001, and
4005. The Model 451 as well as the Models 352, 418, T418, 428, and 441A will operate
side by side in any of these enclosures.
ABOUT THIS MANUAL
The following sections are in this manual:
Specifications
This is a complete technical description of the
Model 451 and the performance that is guaranteed.
While the performance specifications are the best in
LVDT signal conditioning, they are conservative. The
user may find that a particular unit will perform well
beyond specification.
Operation
Here the user will find complete instructions to use the
Model 451. An operational-state diagram enhances the
discussion. Also discussed are the various enclosures
available for the Model 451 and other 352 and 400
Series units.
Applications
Because the Model 451 is designed as a universal
LVDT-signal conditioner, it would be impossible to
address every possible use for this product. Rather,
this section is written to help the user get the most
from the data resulting from using the Model 451.
Concerns about cabling, shielding, common-mode
voltage, etc. are addressed.
Description
Model 451
1-2
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