Related Manuals for Measurement Computing CIO-EXP-RTD16
Summary of Contents for Measurement Computing CIO-EXP-RTD16
- Page 1 CIO-EXP-RTD16 RTD EXPANSION BOARD User’s Manual Revision 2 © Copyright, November, 2000...
- Page 2 I/O boards face some harsh environments, some harsher than the boards are designed to withstand. When that happens, just return the board with an order for its replacement at only 50% of the list price. Measurement Computing Corp. does not need to profit from your misfortune.
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Page 3: Table Of Contents
............3.4 CONNECTING THE CIO-EXP-RTD16 TO THE A/D BOARD . - Page 4 5.6.1 Two-wire RTD Hookup ..........5.6.2 Three-Wire RTD Hookup .
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Page 5: Introduction
To update the InstaCal configuration file to include CIO-EXP-RTD16 information, start InstaCal, select the board number of the DAS board that has the CIO-EXP-RTD16 connected to it, and select the channel number the CIO-EXP-RTD16 is connected to. The options for the CIO-EXP-RTD16 will be available to set and change. -
Page 6: General Configuration
Jumper positions labeled “CH SEL” located near the 37-pin connectors are used to select one CIO-EXP-RTD16 output channel to which the output from the addressed RTD will be connected. This setting determines which A/D channel is used to acquire data from the CIO-EXP-RTD16 when it is connected to an A/D board. -
Page 7: Configuring The A/D Board
One individual channel must be selected for each bank of 16 EXP channels. For example, if you are using several CIO-EXP-RTD16 boards, the jumper setting for each board must be unique. If you select channel 0 for the first board, do not use this channel for any of the other boards. -
Page 8: Connecting The Cio-Exp-Rtd16 To The A/D Board
A CIO-DAS08 series board may be connected directly through a C37FF series cable from the P1 connector on the CIO-EXP-RTD16 to the A/D analog connector. The JB10 jumper should be left in the DAS08 position as set at the factory. -
Page 9: Powering The Cio-Exp-Rtd16
3.5.3 Powering with the C-PCPOWER-10 cable: The CIO-EXP-RTD16 may be powered from the PC's power supply by connecting it to that power supply through a C-PCPOWER-10 cable. This cable has the same Molex connector that is used inside the PC and so may be connected directly to the PC's power supply through one of the spare connectors. -
Page 10: Daisy-Chaining Cio-Exp-Rtd16 Boards
(CH SEL jumper is set to a different number on each board). 3.7 CONNECTING A VOLTAGE SIGNAL Make your initial test of the CIO-EXP-RTD16 with a simple voltage signal of between 0 and 5V. If you have a variable signal source, all the better. -
Page 11: Voltage Measurement Configuration
You can expand the number of inputs of your DAS board by sixteen for every CIO-EXP-RTD16 board, up to the number of inputs on the DAS board. For example, a DAS08 has eight inputs. Eight times sixteen is one hundred and twenty eight. Using CIO-EXP-RTD16 boards you can bring 128 inputs into the PC with one DAS08 in one slot. -
Page 12: Setting The Gain
To choose a switch-selectable amplification, calculate as follows: If your signal is bipolar, divide 10 by the full range of the signal. For example, if your signal ranges between ±1/2 volt, the full range is 1 volt. Divide 10 by 1 for a result of 10. That is the maximum gain you can use. -
Page 13: Attenuation
Voltage signals may be single ended or differential, and the full scale may have to be matched to the range of the CIO-EXP-RTD16 and DAS board combination via amplification or division. To connect a voltage and make an accurate measurement, each of these factors must be considered. -
Page 14: Floating Differential
A floating differential input has two wires from the signal source and a 10K ground reference resistor installed at the CIO-EXP-RTD16 input. The two signals from the signal source are Signal High and Signal Low. The reference resistor is connected between the CIO-EXP-RTD16 -SENSE and -IEXC pins (Figure 4-6). -
Page 15: Fully Differential
The signals are Signal High, Signal Low and Signal Ground (-IEXC) (which is LLGND). A differential connection allows you to connect the CIO-EXP-RTD16 to a signal Ground cable shield at –IEX source with a ground that is different from terminal only. -
Page 16: Rtd Measurement Configuration
The General Configuration section describes the power selection options, setting the power select switch and verifying the installation and operation of the CIO-EXP-RTD16 with your data acquisition board. Configure your boards as described in that section before continuing with this section. -
Page 17: Setting The Gain
212.02 247.04 At a temperature of 400°C, the maximum resistance is 247.04 ohms The equation for the voltage out of the CIO-EXP-RTD16 (the voltage your DAS board will convert into a number) is: * GAIN Normally, the CIO-EXP-RTD16 supplies 1 mA of excitation current. The choices for standard gains are 1, 2, 4, 7, 8, 14, 28, or 56. -
Page 18: First Stage Gain
Base Resistance Stage 1 Gain Stage 2 Gain Total Gain 100 Ohms 1000 Ohms 5.4.1 First Stage Gain A set of three Gain Select switches on the S1 GAIN switch block selects the first stage gain (Figure SELECT 4-4). The fourth switch on this block (marked CUSTOM) is used to select a custom second stage gain. -
Page 19: Channel Configuration Switch
CIO-EXP-RTD16 are designed to provide the excitation and signal conditioning required to use RTDs. An RTD may have 2, 3, or 4 wires that connect to the CIO-EXP-RTD16. Figures 5-4, 5-5, and 5-6 show the three types of RTD connections and how to connect them to the input channels. -
Page 20: Two-Wire Rtd Hookup
A two wire RTD has two leads, one to each side of the temperature sensitive resistor. excitation current is connected directly to the CIO-EXP-RTD BOARD leads at the CIO-EXP-RTD16 screw terminals. A 2-WIRE +IEXC (EXCITATION CURRENT (+)) two wire connection is less accurate than the 4... -
Page 21: Four-Wire Rtd Hookup
Please solder carefully! Remember, you are making a modification to the CIO-EXP-RTD16 and if it is not made well the quality of the signal may be affected. Use only solder with a water soluble flux and be sure to remove all the flux after you have finished soldering. -
Page 22: Custom Second Stage Gain Resistor - Rx100
Calculate a new Vref using the desired Iexc: Vref = 10V - 5K * Iexc Then calculate R89 value: R89 = 10K [ ( 2 − 10V / Vref ) / ( 10V / Vref − 1 ) ] Install the custom excitation current resistor in R89. Set switch S2 position 1 to OFF 6.2 CUSTOM SECOND STAGE GAIN RESISTOR - RX100 The formula for calculating the value of RX100 is:... -
Page 23: Specifications
7 SPECIFICATIONS Power consumption 380mA typical, 533mA max Analog input section Multiplexer type HI507 Number of channels 16 differential Input ranges ±10V Gain options First stage X1, X2, X4 or X8 Second stage X1, X7 or User defined between X7 and X64 Multiplexor switching time 5 µS typical to 0.01% of 5V step Channel to channel settling time... - Page 24 Current Excitation Excitation Switch selectable for 1 mA on board or custom value determined by resistor selection Voltage compliance Accuracy Trimmable Digital Section Digital Type Din 0 - 2 HI508 multiplexor Din 3 1 CMOS load Number of channels 4 inputs Input High 2.0 volts min, +5.5 volts absolute max Din 0 - 2...
- Page 25 EC Declaration of Conformity We, Measurement Computing Corp.., declare under sole responsibility that the product: CIO-EXP-RTD16 RTD Expansion Board Description Part Number to which this declaration relates, meets the essential requirements, is in conformity with, and CE marking has been applied according to the relevant EC Directives listed below using the relevant section of the following EC standards and other informative documents: EU EMC Directive 89/336/EEC: Essential requirements relating to electromagnetic compatibility.
- Page 26 Measurement Computing Corporation, 16 Commerce Blvd., Middleboro, MA 02346 Tel: (508) 946-5100 Fax: (508) 946-9500 E-mail: info@MeasurementComputing.com www.MeasurementComputing.com...
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