Ectron 451 Instruction Manual

Lvdt and rvdt signal conditioner

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

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.

Please send corrections and suggestions to howiec@ectron.com.

Ectron Corporation

INSTRUCTION MANUAL

MODEL 451

LVDT AND RVDT

SIGNAL CONDITIONER

Ectron Corporation

8159 Engineer Road

San Diego, CA 92111-1980

858-278-0600

858-732-8159

Fax: 858-278-0372

www.ectron.com

sales@ectron.com

Table of Contents

Need help?

Do you have a question about the 451 and is the answer not in the manual?

Questions and answers

Summary of Contents for Ectron 451

Page 1 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.
Page 3 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.
Page 5: Table Of Contents
TABLE OF CONTENTS PAGE Warranty Inside Front Cover Section I, Description General Modes of Operation Other Features Enclosures About This Manual Section II, Specifications Input Dynamic Response Output Excitation Input Power Calibration and Alignment Environment Physical Parameters Compatibility Notes Section III, Operation General View Angle Connections and Enclosures...
Page 6 Table of Contents Model 451 PAGE Filter Setup 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...
Page 7 Model R408-14 Enclosure Model R418-7 Series Enclosure Model R418-M1028C Enclosure Figures Model 451 Figure 3-1, Typical LVDT Connection to the Model 451 Figure 3-2, Main Menu Figure 3-3, Secondary Menu 3-11 Figure 4-5, Typical Output Filter Figure 6-1, Output Alignment...
Page 8 Table of Contents Model 451...
Page 9: Section I, Description
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.
Page 10: 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.
Page 11 Model 451 Description Theory of operation Because the Model 451 is an encapsulated unit, repair in the field is strongly discouraged. Therefore, a de- tailed circuit analysis is foregone in this manual. However, theory at the block-diagram level as well...
Page 12 Description Model 451...
Page 13: Section Ii, Specifications
Section II SPECIFICATIONS INPUT Configuration Differential. 100 kΩ ±5% each input. Input Impedance Common-mode-voltage 20 V dc or peak ac. Range DYNAMIC RESPONSE Gain Range 1 to 300, either polarity (automatically set in example and scale modes). Gains of less than unity are not sup- ported.
Page 14: Environment
255 g (9 oz) nominal. Connector DA-15P (mate DA-15S). COMPATIBILITY The Model 451 will operate in all standard Ectron enclosures designed for conditioner-amplifier Models 352, 418, T418, and 428 and the Model 441A frequency-to- voltage converter. See Table 3-2 for connection information. NOTES 1.
Page 15 ±0.1%, this output can be used to check linearity of the instrumentation fol- lowing the Model 451. The output voltage can be varied also by varying the displacement reading while in the displacement part of the calibration mode.
Page 16 Specifications Model 451...
Page 17: General
(contrast and brightness) has been incorporated into the Model 451. When power is on, from any screen (even if the screen is blank or dark), press and hold the display for more than two seconds. Then turn the encoder (clockwise to darken, counterclockwise to lighten) until the screen is adjusted for best contrast and bright- ness.
Page 18: Controls
Operation Model 451 Figure 3-1 Typical LVDT Connection to the Model 451 CONTROLS The Model 451 is operated using only the two front-panel controls: the display and the encoder. Display In addition to displaying the various screens, the display is used to accept the data, or settings, as they appear on the screen when it is pressed and released.
Page 19: Updating Memory
These screens are maintained so that the user will know that action is required to return the Model 451 to a fully operational state, or it recognizes that the user probably intends to make a change.
Page 20: Operation Scheme And Main Menu
The operating screen selected will stay on until either the encoder is press again or the display is pressed taking the user to the main menu or beyond. When the Model 451 is returned to the operating screen in this situation, it will be alternating.
Page 21: Gain-Mode Setup
451 voltage output to LVDT voltage output, set the transducer sensitivity, and the Model 451 is ready to measure. This is the classic mode of operation for LVDT-signal conditioners. When the gain mode is not active, the user will encounter a GAIN ACTIVE? NO screen that asks whether to activate this mode.
Page 22 Operation Model 451 (or gain) at which the Model 451 operates. If the core moves beyond Point 2 or if it moves in the opposite direction, the Model 451 will continue to provide accurate data as long as built-in limits of the Model 451, such as 10.5 V output, and the LVDT (displacement range) are not violated.
Page 23: Scale-Mode Setup
Rather, they define a sensitivity (or gain) at which the Model 451 operates. If the core moves beyond Point 2 or if it moves in the opposite direction, the Model 451 will continue to provide accurate data as long as built-in limits of the Model 451, such as ±10.5 V output, and the LVDT are not violated.
Page 24: Autozero
32 V dc with reference to Output Low, Pin 11. If the user wishes to uses the same power supply as that which powers the Model 451, Pin 11 and Pin 15 must be con- nected together. When remote autozero is commanded the display will read A-ZERO PLEASE WAIT or ZERO OUT OF RANGE.
Page 25: Zero Setup
Zero offset is the amount of offset applied by the Model 451, and output offset is the zero offset plus the output due to an input to the Model 451. When zero is not on, pressing the ZERO SETUP screen brings the user to the screen ZERO CONTRL ? NO.
Page 26: Other
Operation Model 451 Model 451 that would be produced if the dialed-in displacement were at the input of Model 451, taking gain, transducer sensitivity, and unit of measure currently active into account. Pressing the CAL screen brings the user to the cal setup menu.
Page 27: Units Of Measure
Y to N (no) and press the display. In either situation, the secondary menu item of UNITS OF MEASUR is again displayed. When Y is on, the Model 451 will not “ time out.” 3-11...
Page 28: Reset System
“ time out” will occur from this screen under both N and Y conditions. ALIGN The alignment menu allows the user to align both the input and output of the Model 451. This operation is fully discussed in Section VI, Alignment.
Page 29: Enclosures
Model 451 to operate properly in them. The Model 451 accepts power from 10.5 V dc to 32 V dc, so enclosures designed for either 12 V or 28 V can be used.
Page 30: Models 4001 And 4005
Operation Model 451 Table 3-4 Model R418-7 14-Channel Enclosures Model Ac Voltage Dc Voltage R418-7AX None R418-7AY None R418-7BX R418-7CY R418-7DX R418-7EY * External input only MODELS 4001 and 4005 The 4000 Series Enclosures are designed for airborne, vehicular, or marine service in mod- erate-to-severe environments.
Page 31 Model 451 Operation of the plug-in conditioner-amplifiers assure high accuracy data despite severe environ- ments. • The ability to operate from unregulated 12- or 28-V-dc power simplifies the logistics of on-board testing of vehicles and aircraft. • An all-autozero switch which will initiate a...
Page 32: Model E408-6
The Model E408-6 enclosure is a six-channel bench-top unit, which will hold Models 352, 418, 428, 441A, and 451 in any combination. Being small, lightweight, and powered either by ac or dc, the enclosure is well suited for use in the field as well as the laboratory.
Page 33: Model R408-14
The Model R408-14 enclosure is a 14-channel 19-inch-wide rack-mount unit that holds Models 352, 418, 428, 441A, and 451 in any combination. It also is powered by either dc or ac and comes in both 12 V dc (Option Y) and 28 V dc (Option X) versions. Model T418 is not accommodated without modification to the enclosure.
Page 34 Model 352 amplifier-conditioners. • As with all Ectron enclosures, the Model R408-14 does not degrade the specifications of any plug-in unit. • Model R408-14Y has an internal 12 V dc power supply, and the R408-14X has a power supply of 28 V dc.
Page 35: Section Iv, Applications
Model 451. Transducers that are most susceptible to this problem are those with a higher output impedance. Note that this effect is in-...
Page 36 When in doubt, use a frequency of 2.5 kHz and 3 V ac amplitude. The Model 451 provides a choice of either 1 V or 3 V am- plitude and frequencies of 400, 1 kHz, 2.5 kHz, 5 kHz, and 10 kHz.
Page 37: Selecting The Operation Mode To Use
1 and 2 with the displacements for Points 1 and 2. The processor precisely calculates the gain and offset values necessary to match the Model 451 to the voltage and displacement values entered. It is not necessary to use the extremes of the displace- ment values for the capture points.
Page 38: Determining The Active Mode
If the polarity is backwards, reverse the signal leads to the Model 451.) DETERMINING THE ACTIVE MODE To determine which operating mode is active, press the display. If zero control is off, the first screen to appear is the active mode.
Page 39: Crosstalk
See Figure 4-1. PHASE CONTROL One of the design features of the Model 451 is that it does not require a phase control. The phase of the incoming signal is derived from the signal applied to the differential amplifier.
Page 40: Emi Protection
For this reason Ectron instrumentation products intended for vehicle applications include EMI filtering in all leads feeding to or from the instrument. Although LVDT and RVDT signals are higher level than those from thermocouples or strain gages, for best accuracy and least noise, precautions must be taken against noise interference.
Page 41: Update Rate
Model 451 Applications be approximately 2.6 s assuming a step function signal at the input. Response time will increase linearly as the frequency setting is increased. UPDATE RATE The update rate of the microcontroller and A-to-D converter is 2 kHz, so their influence on the response of the conditioner is minimal.
Page 42 Applications Model 451...
Page 43: Section V, Theory Of Operation
LVDT, as well as calibration of its own input and output circuitry. The Model 451 has an overall gain range of 1 to 300, both positive and negative. Specifying negative gain will result in inversion of the output signal, which is useful since it is often rather tedious to predict the polarity of an LVDT system in advance.
Page 44: Scale Mode
Output calibration requires the user to connect a digital voltmeter to the Model 451’s output. The user then adjusts the front-panel controls to set the Model 451’s output to +10 volts, then −10 volts.
Page 45: Equipment Required
SECTION VI ALIGNMENT GENERAL The Model 451 is easily aligned in two steps: output alignment and input alignment. Prior to aligning the Model 451, the user should read Section III, Operation, to become familiar with its operation. EQUIPMENT REQUIRED Digital multimeter Hewlett Packard Model 3478A or equivalent.
Page 46: Output Alignment
Alignment Model 451 Figure 6-1 Output Alignment 4. Press the display, and the display should now read ALIGN +10 NNNNN where NNNNN is a five-digit number from 14848 to 16383. 5. Using the encoder, adjust the reading on the dc volt- meter until it is +10 V dc, ±0.003 V dc.
Page 47: Input Alignment
Input alignment is accomplished in three steps called DIV 1, DIV 2, and DIV 3. 1. Connect the Model 451 and dc voltmeter as is shown in Figure 6-2. Make sure to provide shielding where indicated. Set PS1 to any voltage between 10.5 and 32 V dc and PS2 to 10 V dc.
Page 48 Pin 14). Repeat this step as necessary if the error screen occurs. This completes the alignment of the Model 451. The user can return to the operate screen by waiting 20 seconds for a “ time out” or by turning the encoder to ALIGN EXIT, pressing the display, turning the encoder to OTHER EXIT, pressing the display, turning the encoder to RETURN TO OPERAT, and pressing the display.
Page 49 SECTION VI ALIGNMENT GENERAL The Model 451 is easily aligned in two steps: output alignment and input alignment. Prior to aligning the Model 451, the user should read Section III, Operation, to become familiar with its operation. EQUIPMENT REQUIRED Digital multimeter Hewlett Packard Model 3478A or equivalent.
Page 50: Figure 6-1 Output Alignment
Alignment Model 451 Figure 6-1 Output Alignment 4. Press the display, and the display should now read ALIGN +10 NNNNN where NNNNN is a five-digit number from 14848 to 16383. 5. Using the encoder, adjust the reading on the dc volt- meter until it is +10 V dc, ±0.003 V dc.
Page 51: Figure 6-2 Input Alignment
Input alignment is accomplished in three steps called DIV 1, DIV 2, and DIV 3. 1. Connect the Model 451 and dc voltmeter as is shown in Figure 6-2. Make sure to provide shielding where indicated. Set PS1 to any voltage between 10.5 and 32 V dc and PS2 to 10 V dc.
Page 52 Pin 14). Repeat this step as necessary if the error screen occurs. This completes the alignment of the Model 451. The user can return to the operate screen by waiting 20 seconds for a “ time out” or by turning the encoder to ALIGN EXIT, pressing the display, turning the encoder to OTHER EXIT, pressing the display, turning the encoder to RETURN TO OPERAT, and pressing the display.
Page 53: Names Of Manufacturers
PARTS LISTS NAMES OF MANUFACTURERS The table below lists the manufacturers of the components used by Ectron in the products for which parts lists and scematics are provided. They are listed numerically for easy cross reference to the parts lists.
Page 54: Section Vii, Parts Lists
Model 451 Parts Lists MODEL E408-6 ENCLOSURE (Drawings 408-600 and 408-601) REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER’S P/N ECTRON P/N C1-C3 CAPACITOR, 4.7UF/35V TANTALUM 00834 199D475X9035CA2 1-444700-1 CAPACITOR, 4.7UF/50V CERAMIC 00493 C340C475M5U5CA 1-444709-0 CR1, CR2 DIODE, SIGNAL 01094 1N457 1-190457-0 CR3,CR4,CR6,CR7 DIODE, SIGNAL...
Page 55: Model R408-14 Enclosure
Parts Lists Model 451 MODEL R408-14 ENCLOSURE (Drawings 408-605 and 408-606) REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER’S P/N ECTRON P/N C1-C3 CAPACITOR, 4.7UF/35V TANTALUM 00834 199D475X9035CA2 1-444700-1 CAPACITOR, 4.7UF/50V CERAMIC 00493 C340C475M5U5CA 1-444709-0 CR1, CR2 DIODE, SIGNAL 01094 1N457 1-190457-0 CR3, CR4, CR6, CR7...
Page 56 Model 451 Parts Lists MODEL R418-7 ENCLOSURE (Drawing 418-627) REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER’S P/N ECTRON P/N CAPACITOR,4.7UF/50V CERAMIC 00493 C340C475M5U5CA 1-444709-0 LAMP 00206 91W-EWR24H-CR0 4-121007-0 J1-J14 CONNECTOR,8-PIN 00044 MS3102A-18-8P 1-310008-0 CONNECTOR,36-PIN 00044 57-30360 1-310136-0 CONNECTOR,3-PIN 00044 MS-3102A-14S-7P 1-310003-0 RECEPTACLE,POWER 00863...
Page 57 Parts Lists Model 451 R418-M1028C ENCLOSURE (Drawing 419-605) REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER’S P/N ECTRON P/N C1-C3 CAPACITOR,4.7UF/35V TANTALUM 00834 199D475X9035CA2 1-444700-1 CAPACITOR,4.7UF 20% 50V 00493 C340C475M5U5CA 1-444709-0 CR1, CR3 PER CHANNEL DIODE,SIGNAL 01094 1N457 1-190457-0 CR5, CR6, CR8, CR9 DIODE,1N4148...
Page 58 Model 451 Parts Lists...
Page 73 ? NO OFFSET ±10.00 - Real time - Real time ADJUST OUTPUT OTHER OUTPUT OFFSET ZERO ZERO OFFSET ±10.00 EXIT RETURN CONTROL CONTROL ZERO OPERAT CONTRL FILTER ZERO FILTER FREQ SETUP SETUP XXX HZ EXIT FILTER MODEL 451 OPERATIONAL STATE DIAGRAM...