DEWESOFT DSI-LVDT Series Product manual

DSI-LVDT ADAPTERS
TECHNICAL REFERENCE MANUAL
DSI-LVDT V20-1
1

DSI-LVDT
TECHNICAL REFERENCE MANUAL
1. Table of contents
1. Table of contents 2
2. About this document 3
2.1. Legend 3
3. Technical data 4
3.1. Electrical specifications 4
3.1.1. Output bandwidth - Magnitude and Phase response 5
3.2. Theory of operation 7
4. Connectors 11
4.1. Input connector pinout 11
4.2. Output connector pinout 13
5. Operation 15
5.1. Connections 16
6. DSI adapters / TEDS sensor supporSt 17
6.1. Manual operation 18
7. Warranty information 20
7.1. Calibration 20
7.2. Support 20
7.3. Service/repair 20
7.4. Restricted Rights 20
7.5. Printing History 21
7.6. Copyright 21
7.7. Trademarks 21
8. Safety instructions 22
8.1. Safety symbols in the manual 22
8.2. General Safety Instructions 22
8.2.1. Environmental Considerations 22
8.2.2. Product End-of-Life Handling 22
8.2.3. System and Components Recycling 22
8.2.4. General safety and hazard warnings for all Dewesoft systems 23
9. Documentation version 26
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
2. About this document
2.1. Legend
The following symbols and formats will be used throughout the document.
Important
It gives you important information about the subject.
Please read carefully!
Hint
It gives you a hint or provides additional information about a subject.
Example
Gives you an example of a specific subject.
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
3. Technical data
3.1. Electrical specifications
DSI - LVDT adapter is powered by EXC voltage. LVDT adapter is compatible with SIRIUS(i) (variable EXC)
or DEWE 43A type instrument (fixed +/-5V EXC).
General specifications
Parameter
Description
Power supply Exc. Voltage
10 V – 15 V, from EXC+ to EXC- outputs
Power supply Exc. Current
44 mA, from EXC+ to EXC- outputs1
Output voltage
1.00 V = 500 mV/V2
Output bandwidth
1 kHz
Gain error
1% of Full Scale
Output TCR
55 ppm/K of Full Scale
Sensor VTR = S x d, Sensitivity
2000 mV/V maximum
Sensor supported type
Differential LVDR or RVDT, Inductive Half-Bridge LVDT
Sensor Exc. voltage
2.88 Vrms (differential)3
Sensor Exc. frequency
Selectable 4.02 kHz / 9.60 kHz typical; 2.5% error
Phase compensation
-50 °C to +85 °C at 4 kHz; -75 °C to +70 °C at 10 kHz
TEDS
1024-Bit, 1-Wire EEPROM4
Electrical specifications
4Only one device per TEDS line is supported. Can be set to internal (adapter) or external (sensor).
3Sinusoidal, 50dB THD typical, not possible to sync from adapter to adapter.
2For sensor VTR (Voltage Transfer Ratio) = 1000mV/V.
1Absolute maximum rating, specified for SIRIUSi.
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
3.1.1. Output bandwidth - Magnitude and Phase response
Figure 1: Typical magnitude response for 4kHz EXC
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
Figure 2: Typical phase response for 4kHz EXC
Figure 3: Typical magnitude response for 10kHz EXC
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
Figure 4: Typical phase response for 10kHz EXC
3.2. Theory of operation
DSI - LVDT Adapter uses a unique ratiometric architecture to eliminate several of the disadvantages
associated with traditional approaches to LVDT interfacing. The benefits of this new circuit are: minimal
adjustments are required; temperature stability is improved; and transducer interchangeability is
improved.
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
Figure 5: Functional block diagram
LVDT adapter SENSE inputs are connected as B-Inputs and adapters IN are connected as A-Inputs.
Phase Lead / Lag circuit will compensate for the difference of the sensor output in reference to Exc. and
Sense inputs.
Output signal level will depend on the phase difference between sensor output and Sense inputs.
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
Figure 6: LVDT adapter output sensitivity to input signal phase lead/lag , 1:1 sensor
Two examples are shown for sensors with sensitivity = 0,5. Output signal level is
1 2 of the Exc. Signal. Sensor
output phase lag is 45⁰. LVDT adapter output is ≈0,35 (≈1Vexc ∙ sensitivity ∙ 0,70) according to Figure 2.
When phase compensation matches phase lead / lag of sensor output LVDT adapter output will be at its
maximum = 0,5 (=1Vexc ∙ sensitivity ∙ 1,00).
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DSI-LVDT
TECHNICAL REFERENCE MANUAL
Figure 7: Example: 45⁰ sensor output , no compensation
Figure 8: Example: 45⁰ sensor output, 45⁰ compensation
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