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DAQP-CFB2 Module
TECHNICAL REFERENCE MANUAL
WELCOME TO
THE WORLD OF
DEWETRON!
Congratulations on your new device! It
will supply you with accurate, complete
and reproducible measurement results
for your decision making.
Look forward to the easy handling and
the fl exible and modular use of your
ISO9001
DEWETRON product and draw upon
more than 30 years of DEWETRON
expertise in measurement engineering.
EN ISO 14001
THE MEASURABLE DIFFERENCE.
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Summary of Contents for Dewetron DAQP-CFB2
- Page 1 Look forward to the easy handling and the fl exible and modular use of your ISO9001 DEWETRON product and draw upon more than 30 years of DEWETRON expertise in measurement engineering. EN ISO 14001 THE MEASURABLE DIFFERENCE.
- Page 2 Copyright © DEWETRON GmbH This document contains information which is protected by copyright. All rights are reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. All trademarks and registered trademarks are acknowledged to be the property of their owners.
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Page 3: General Information & Safety Instructions
Warranty Information: A copy of the specific warranty terms applicable to your DEWETRON product and replacement parts can be obtained from your local sales and service office. Restricted Rights Legend: Use austrian law for duplication or disclosure. - Page 4 Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the product. DEWETRON Elektronische Messgeraete Ges.m.b.H. assumes no liability for the customer’s failure to comply with these requirements.
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Page 5: Safety Instructions
DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the product. Return the product to a DEWETRON sales and service office for service and repair to ensure that safety features are maintained. - Page 6 Support For any support please contact your local distributor first or DEWETRON directly. For Asia and Europe, please contact: DEWETRON GmbH Parkring 4 8074 Grambach AUSTRIA Tel.: +43 316 3070 Fax: +43 316 307090 Email: support@dewetron.com Web: http://www.dewetron.com The telephone hotline is available Monday to Friday between 08:00 and 12:00 CET (GMT -1:00) and Monday to Thursday between 13:00 and 17:00 CET.
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Page 7: General Module Information
General Module Information Calibration information All DEWETRON modules are calibrated at 25 °C after a warmup time of 30 minutes and meet their specifications when leaving the factory. The time interval for recalibration depends on environmental conditions. Typically, the calibration should be checked once a year. - Page 8 For all DEWETRON systems, an internal RS-232/485 converter is available (standard with DEWE-800, -2000, -2500, -3000, -4000, -5000 series systems). This converter allows communication with HSI/DAQP and PAD modules. To communicate with the modules, the RS-232 interface has to be set to the following parameters:...
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Page 9: Module Specifications
DAQP-CFB2 Carrier frequency amplifier Bandwidth: max. 9.6 kHz Input ranges: Bridge: 0.1 mV/V to 1000 mV/V LVDT: 5 mV/V to 1000 mV/V Capacity: 20 pF to 1 µF Sensor Excitation: Programmable voltage and frequency up to / 20 kHz; remote sense support Bridge completion: Internal completion for ½... -
Page 10: General Description
DAQP-CFB2 General description The signal path of the DAQP-CFB2 is completely analog. This reduces the signal delay to the absolute minimum, which is a huge advantage in comparison to a DSP based bridge amplifier with AD and DA conversion. DSP based bridge amplifiers always have a delay due to the calculation. The analog design makes the DAQP-CFB2 a perfect choice for control loop applications, where a fast response is required. - Page 11 DAQP-CFB2 Apply shunt: Press the FILTER button for more than 3 seconds to apply the internal shunt resistor as long as you keep the button pressed. Apply Zero ref.: Press the RANGE button for more than 3 seconds to shortcurcuit the module input as long as you keep the button pressed.
- Page 12 Remote Sense The DAQP-CFB2 supports remote sense. That means that the excitation voltage loss in the sensor cable is compensated. The sense line terminals are internally connected to the excitation via a 100 kΩ resistor. For accurate voltage regulation there has to be also an external connection.
- Page 13 DAQP-CFB2 Sensor Balance Typically every strain gage sensor has a certain offset. This arises from manufacturing tolerances or from sensor mounting. By performing a sensor balance the sensor offset can be removed on the analog side up to 400 % of the actual range. This allows using the full range of the AD board instead of losing resolution because of digital offset shifting.
- Page 14 For ranges above 100 mV/V because of the low amplifi cation and therefore less infl uence of crosstalk between wires and cables. In some special DEWETRON Racks pin 8 is already in use for customized sensor supply voltage level. If so, only single mode operation is possible.
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Page 15: Signal Connection
DAQP-CFB2 Bridge mode accuracy Excitation Input ranges Amplifier gain mv/V mv/V mv/V Accuracy 1000 0.1% of reading ±0.05% of range 0.1% of reading ±0.05% of range 12.5 0.1% of reading ±0.05% of range 0.1% of reading ±0.05% of range 0.1% of reading ±0.05% of range 0.1% of reading ±0.05% of range... - Page 16 DAQP-CFB2 Full bridge signal connection 6-wire and 4-wire sensor connection EXC+ Sense+ 4-wire connection 6-wire connection TEDS Data TEDS Sense- EXC- Shield Voltage or current excitation is allowed. Sense terminals have to be connected to excitation also when 4-wire connection is used.
- Page 17 DAQP-CFB2 Quarter bridge signal connection 3-wire sensor connection (Sense+ is connected to EXC+ at the connector) EXC+ Sense+ TEDS Data TEDS Sense- EXC- Shield Sense leads (D-SUB: pin 3 and 6) have to be connected! 3-wire quarter bridge is only able to compensate symmetric wire resistance!
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Page 18: Capacitance Measurement
DAQP-CFB2 Capacitance measurement Capacitance measurement of the DAQP-CFB2 works with the following technology. It applies a determined excitation AC voltage with 5 kHz to the capacitor. The module measures the current through the capacitor by using the 120 Ω completion resistor as a shunt. Depending of the unknown impedance, this current is phase shifted to the excitation voltage. - Page 19 DAQP-CFB2 Why use more wire technology Sensitivity: For sensor wiring typically copper cables are used. For example a 120 Ω full bridge connected with a 4 x 0.14 mm cable will have an sensitivity error of 2.1 % just because of the 1.27 Ω...
- Page 20 DAQP-CFB2 Notes...
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Page 21: Ce Certificate Of Conformity
CE-Certificate of Conformity DEWETRON GmbH Manufacturer: Address: Parkring 4 8074 Grambach, Austria Tel.: +43 316 3070 0 Fax: +43 316 3070 90 e-mail: sales@dewetron.com http://www.dewetron.com Name of product: DAQP-CFB2 Signal conditioning module Kind of product: The product meets the regulations of the following EC-directives: 2014/35/EU "Directive of the European Parliament and of the Council of 26 February 2014 on the... - Page 22 NOTES...
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