USER`S MANUAL
Contents
1. signal see Appendix B WARNING Do not connect your tilt sensor to pins 1 6 Sensor damage not covered by the warranty will result Pin Function Wire Color 1 DC power in red 2 Signal ground white 3 Power ground black 4 Tilt out green 5 Tilt out blue 6 Temperature out yellow In the standard Model 84800 the temperature sensor is soldered to the circuit board at the X locations T1 T2 and T3 Figure 1 If you are using a temperature sensor that plugs into the circuit board the wire colors corresponding to the T1 T2 and T3 positions can be found in the user s manual for your tilt sensor package 4 GROUNDING AND TRANSIENT PROTECTION Signal and power ground pins 2 and 3 Figure 1 are common on the circuit board However if you plan to measure single ended tilt or temperature at a distance more than several meters away from the board it is a good idea to measure the tilt signal pin 4 and the temperature signal pin 6 with reference to a wire connected to signal ground pin 2 Run a separate power ground wire to your power supply from pin 3 Do not connect signal and power grounds at the power supply With this wiring arrangement no current flows in your signal ground wire The output voltage should therefore be the same at your measurement point as on the Model 84800 circuit board SHEOGO 44 Ls e F eM KR a T F 2 300 x Kx kK amp X xx y J TIX a xeTZ x 42. B contains custom specifications for your unit Output Range Tilt Single ended 8 volts to 5 volts DC typical Differential 10 volts to 10 volts DC usable range Output Range Temperature Single ended only 0 40 volts to 1 00 volt DC Scale Factors Tilt See Appendix B Temperature 0 1 C mV Tilt Output Filter 2 pole Butterworth low pass filter Roll off 12 dB per octave See Appendix B for your filter time constant Output Impedance 270 ohms short circuit and surge protected Power Requirements 8 to 17 VDC 10 mA typical 250 mV peak to peak ripple max Environmental 25 to 70 C operational 30 to 100 C storage 0 to 90 humidity noncondensing Mounting Four 0 12 inch 3 05mm dia holes on 2 30 inch 58 4 mm centers Dimensions 2 47 x 2 47 x 0 63 inches 62 7 x 62 7 x 16 mm Weight 0 75 oz 21 g Materials Fiberglass printed circuit board 3 MAKING CONNECTIONS Circuit board geometry and connector locations are shown in Figure 1 Your tilt sensor connects to the board at the pins marked E and The tilt sensor wires corresponding to these positions are defined in the user s manual for your tilt sensor Power input and signal output connections are made at the pins marked 1 2 3 4 5 and 6 Figure 1 Pin designations and wire color coding of the connector assembly shipped with your signal conditioner are defined in the table below For additional information on recording your
3. TROUBLESHOOTING Keep your signal conditioner clean dry and away from extremes of heat and cold Water is the enemy of operating circuits If the signal conditioner becomes wet while powered up corrosion and damage will quickly follow Water damage to the circuit voids the warranty If there is no output when you have connected the signal conditioner to power and to a tilt sensor check to make sure that all connectors are securely attached Failure to obtain an output signal typically results from a broken wire or connection If the output is stuck at one end of the output range the tilt sensor may simply be tilted off scale Slowly rotate the sensor back and forth to check this possibility The tilt output should pass through zero volts as you move the sensor through its null level position If the output still does not change a sensor wire may be broken WARNING Do not test the tilt sensor with an ohmmeter permanent damage will result Please call Applied Geomechanics for assistance if you have not solved the problem after performing the checks outlined above A WARRANTY AND ASSISTANCE Applied Geomechanics Model 84800 Signal Conditioner is warranted against defects in materials and workmanship for one year from the date of delivery We will repair or replace at our option products that prove to be defective during the warranty period provided they are returned prepaid to Applied Geomechanics Inc No other warranty is expressed or im
4. T34 4 d k x 2 400 0 035 pam Figure 1 Model 84800 circuit board component side Positions E and are the tilt sensor connections Positions 1 6 are the power input and signal output connections Positions T1 T2 and T3 are the temperature sensor connections Dimensions are in inches 1 inch 25 4 mm Measuring your tilt signal differentially pin 4 with respect to pin 5 eliminates the ground reference and also prevents a voltage shift between signal conditioner and measurement point Each of pins 1 through 6 is connected to the mounting hole in the lower left corner of the board Figure 1 through variable resistance type transient surge absorbers For maximum protection against high voltage transients this corner of the board should be earthed to a grounding rod pipe or other metal object that is driven into the earth 5 INITIAL CHECK OUT PROCEDURES You can verify that your system is working properly by performing the following simple test 1 Connect your tilt sensor to your signal conditioner at pins E and Connect DC power and power ground to your signal conditioner at pins 1 and 3 3 Use a voltmeter to read temperature between pins 6 and 2 Verify that the indicated temperature corresponds to your actual ambient temperature room temperature 20 C 4 Use a voltmeter to read single ended tilt output between pins 4 and 2 Verify that the output voltage range corresponds to that in
5. USER S MANUAL MODEL 84800 SIGNAL CONDITIONER Serial no Applied Geomechanics Inc 1336 Brommer St Santa Cruz CA 95062 USA Tel 831 462 2801 Fax 831 462 4418 e mail applied geomechanics com www geomechanics com 2005 Applied Geomechanics Inc Manual no B 97 1001 Rev B Printed in USA 1 INTRODUCTION Your Model 84800 Signal Conditioner is a high precision low noise printed circuit assembly designed to operate Applied Geomechanics Miniature Tilt Sensors Series 755 756 and 757 In addition it is an effective and reliable signal conditioner for electrolytic tilt sensors made by other manufacturers The DC powered Model 84800 generates the AC excitation necessary to operate the tilt sensor then demodulates amplifies and low pass filters the signal into high level analog voltage outputs Single ended ground referenced and differential not ground referenced outputs are both provided Model 84800 also takes temperature readings from a National Semiconductor LM35 temperature sensor mounted on the circuit board Output is a single ended analog voltage proportional to temperature in degrees Celsius This user s manual presents performance specifications for your signal conditioner explains how to make connections and gives the scale factors for the sensor signal conditioner combinations delivered with your order 2 SPECIFICATIONS General specifications for the Model 84800 Signal Conditioner are listed below Appendix
6. dicated in the specifications above as you tilt your sensor through its full angular range The positive tilt output should be more than 5 volts DC 5 User a voltmeter to read differential tilt output between pins 4 and 5 Verify that the output voltage range is at least as great as that indicated in the specifications above as you tilt your sensor through its full angular range If your results are not consistent with the specified performance check to be sure that the signal conditioner is receiving power in the specified voltage range and that all connections are good If power and connections are good but you are still having problems call Applied Geomechanics Inc in California for technical assistance at 408 462 2801 WARNING Never use an ohmmeter to check your tilt sensor Ohmmeters operate with direct current DC Applying DC power to the tilt sensor will cause permanent damage that is not covered by the warranty 6 CONVERTING OUTPUT READINGS TO TILT ANGLES AND TEMPERATURES The signal conditioner outputs are quickly converted to tilt angles and temperatures by multiplying the voltage readings by the scale factors supplied in Appendix B For example if the scale factor is 0 100 degrees volt and the voltage output reading is 0 152 volt then the tilt angle is 0 0152 degree from sensor null Similarly a temperature output of 210 millivolts multiplied by the scale factor 0 1 C mV equals a temperature of 21 C 7 MAINTENANCE AND
7. nge Single ended Differential Filter Your signal conditioner filters the tilt signal with a two pole Butterworth low pass filter with a roll off of 12 dB per octave 40 dB decade above the corner frequency The time constant t for the filter is listed below After an instantaneous step the output settles to 98 of its final value after four time constants Corner or cutoff frequency is calculated as fe 1 2 nt The time constant for your signal conditioner is T seconds Angle Conversion Chart To convert the units in the left column to the units across the top multiply by the values in the table J degrees are minutes are seconds radians mm meter inches egos YOO as 0 Fac mines 007 1 0 291 0201 3493 mm meter
8. plied The warranty is void if the equipment is damaged by water or high voltage transients After expiration of the warranty AGI will repair the equipment at its factory for parts and labor charges Products returned after warranty expiration should be accompanied by a purchase order to cover repair costs Applied Geomechanics Inc is not liable for consequential damages THE REMEDIES PROVIDED HEREIN ARE THE BUYER S SOLE AND EXCLUSIVE REMEDIES AGI SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY B CUSTOM SPECIFICATIONS FOR YOUR MODEL 84800 SIGNAL CONDITIONER Serial number Scale Factors Single ended tilt output is measured between pins 4 and 2 Figure 1 Differential output is measured between pins 4 and 5 The scale factor for differential output is one half the scale factor for single ended output The scale factors below are for tilt sensors calibrated with your Model 84800 Signal Conditioner Calibrations are performed by tilting the sensor through a known set of angles and measuring the output A minimum of 10 steps are taken Scale factors are the slope of the linear regression line through the data Nonlinearity is the maximum deviation of any point from the regression line divided by the calibration span 0 5 degree angular range 1 0 degree span expressed as a percentage Range Units Scale Factor Units Temp C Ra
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