Measurement-computing CIO-EXP-GP Manuel d'utilisateur Page 1

CIO-EXP-GPUser’s ManualRevision 2January, 2001© Copyright 2001, Measurement Computing Corporation

affect measurements. If the potential exceeds the protection range of the input circuits, the board may bedamaged.At this time, ignore the other scre

3.8 Verifying the InstallationFor verification of the installation, leave any switches or jumpers not mentioned above in their defaultpositions. Each

4 CONFIGURATION FOR VOLTAGE MEASUREMENTThe CIO-EXP-GP is an amplification, signal conditioning and multiplexing accessory for DAS boards.The inputs ar

To choose a switch-selectable amplification, here are the calculations you need to perform:Divide the full range selected for the A/D board by the ful

4.4.2 Setting Channel GainCH0X1000X100X10UGAIN FOR CHANNELS 0 and 4SET FOR A GAIN OF 10.SLIDER DOWN SELECTS GAINALL OTHERS TO BE OFF (UP)ONONCH4Select

Volts InVolts DividedRaRbINPUTPC GROUNDOUTPC GROUNDA voltage divider is constructed from a pair ofprecision resistors selected according to theequatio

+P EXCITATION. VOLTS−SENSE + SENSE(+)IEXCCH0− VOLTS IN OR COMMON+ VOLTS INSHORTING WIREINSTALLED+EXCITATION CURRENT + SENSE−P(−)IEXC− SENSE +

4.8 Verifying the InstallationTo verify the installation, use the InstaCal program installed on your computer. This software came withyour A/D board

5 CONFIGURATION FOR THERMOCOUPLE MEASUREMENT Thermocouples are temperature sensors constructed of wires of two dissimilar metals fused together at apo

12345678910 11 12 14 15013CJC SELCHANNEL 4 SELECTEDFOR COLD JUNCTION SENSOR OUTPUTThe jumper for the CJC channel select (Figure 5-1)looks just like th

LIFETIME WARRANTYEvery hardware product manufactured by Measurement Computing Corp. is warranted against defects in materials orworkmanship for the li

Table 5-1. 100K ohm Resistors to be Installed for OTD:RX47Channel 7RX 35Channel 5RX 23Channel 3RX11Channel 1RX41Channel 6RX 29Channel 4RX 17Chan

5.3.3 Adding a Ground ReferenceThe CIO-EXP-GP inputs are fully differential which helps reject noise on thermocouple wires. Ifthermocouples connected

Voltages which exceed the ±5V range are in bold italics in the table above. Table 5-5 shows thetemperature at which the reading is clipped (the maxim

There is a gain switch for each channel (Figure 5-6). Set the input channel gain to match the expectedvoltage output of the bridge you are measuring t

6 CONFIGURATION FOR RTD MEASUREMENTSAn RTD is a temperature sensor that consist of a resistive element, usually a length of wire encased in asheath.

12-bit A/D improves from 2.4 millivolts per bit to 0.24 millivolts per bit. If you needed to measure achange of 1 millivolt, you would need an amplif

If gain is set to X10, the DAS board will see 2.474 volts. This is ideal for a DAS board with a 2.5Vunipolar range. If the gain were set to X25, th

6.6.2 Setting the Channel GainCH0X1000X100X10UGAIN FOR CHANNELS 0 and 4SET FOR A GAIN OF 10.SLIDER DOWN SELECTS GAINALL OTHERS TO BE OFF (UP)ONONCH4Ch

6.8 Connecting RTDs To Screw TerminalsThe connections made to the screw terminal depend on the type of RTD you are using. The inputs of theCIO-EXP-GP

EXCITATION CURRENT (+)SENSE HIGH (+)SENSE LOW (-)EXCITATION CURRENT (-)4 WIRE RTDThese connections eliminate the fixed inaccuracyassociated with the

Table of Contents175.4 Determining the Appropriate Gain...175.3.3 Adding a Ground Reference...

7 CONFIGURATION FOR RESISTANCE MEASUREMENTSResistance measurements are made using the CIO-EXP-GP by constructing a resistor “bridge” containingknown r

supply all eight sensors. This is an extreme case but is indicative of the attention you must pay to powerrequirements when using bridge sensors.Also

7.4.3 Selecting the Excitation Voltage10V+5 COMPX2.5GND0.5V1V2V4VS17REMX1DIP switch S17 has five switches to select bridgeexcitation voltage. Only se

7.6.1 Setting the Board Gain10V+5 COMPX2.5GND0.5V1V2V4VS17REMX1There is a switch on DIP switch block S17(Figure 7-3) labeled X1 and X2.5. Sliding thi

Table 7-1. User-Specified Gain Resistor PositionsRX1077RX1033RX1066RX1022RX1055RX1011RX1044RX1000Resistor PositionChannelResistor PositionChannel10 Oh

this bridge or the entire bridge. Examples of each of these configurations follow. Figure 7-6 is aschematic of the bridge circuit.GAIN SWAMPEXCITATI

Referring back to Figure 7-6, the legs of the bridge are labeled A, B, C and D. Table 7-3 below matchesthe legs of the bridge to the resistor number

A Quarter Bridge ExampleFor ¼ bridge circuits, the strain gauge has a single resistive element that is connected as one leg of thebridge. The other t

A Half Bridge ExampleFor a ½ bridge circuit (Figure 7-7), the strain gauge has two resistive elements which are connectedacross two legs of the bridge

Full Bridge ExampleFull bridge strain gauges consist of all four bridge resistors (Figure 7-8). Obviously, no bridgecompletion resistors are installed

389.2 Reference Material for Application of Strain Gauges...389.1.2 Specification of Strain Gauges...

8 SPECIFICATIONSPower Consumption+5V 380mA typical, 533mA maxAnalog Input SectionInput amplifier type INA102Number of channels 8 differentialGains Ea

Analog Output SectionOutput Amplifier type OP07Number of channels 1Maximum Output Range ±10VCurrent Drive ±5 mAOutput short-circuit duration 25 mA ind

9 APPENDIX9.1 About Strain Gauges9.1.1 What Are Strain Gauges?εA Strain Gauge is a variable resistance device whose resistance changes in proportion t

Published by Society for Experimental Mechanics, order #ELS-017The Art of Practical and Precise Stain Based Measurementby James Pierson. 1992, 400 pag

For your notes40

EC Declaration of ConformityWe, Measurement Computing Corp., declare under sole responsibility that the product:DescriptionPart NumberVoltage, TC, RTD

Measurement Computing Corporation16 Commerce Boulevard,Middleboro, Massachusetts 02346(508) 946-5100Fax: (508) 946-9500E-mail: info@measurementcomputi

1 INTRODUCTIONThe CIO-EXP-GP is an eight-channel, signal conditioning accessory designed for use with the DAS08and DAS16 family of data acquisition bo

3 GENERAL CONFIGURATION3.1 A/D Board Type Select JumperThe CIO-EXP-GP can be used with either DAS08 or DAS16 family boards because the signalassignmen

There are three groups of 16-position jumpers. One jumper group determines the signal output channel,one jumper group determines the excitation voltag

If the range on your A/D board is fully programmable, the software you use for measurement willdetermine the range.3.4 CONNECTING THE CIO-EXP-GP TO TH

3.5 Powering The CIO-EXP-GPThe CIO-EXP-GP can be powered through the 37-pin cable, the power screw terminal or the Molexconnector. The power that can