Model 7290A Variable capacitance accelerometer

1 The Endevco Model 7290A Microtron accelerometer family utilizes unique Variable capacitance microsensors. The accelerometers are designed for measurement of relatively low level accelerations in aerospace and automotive environments. Typical applications require measurement of whole body motion immediately after the accelerometer is subjected to a shock motion, and in the presence of severe vibrational inputs. Gas damping and internal overrange stops enable the anisotropically-etched silicon microsensors to withstand high shock and acceleration loads. The Model 7290A can operate from V to V and provide a high level, low impedance output.

2 The 2 volt differential output is dc coupled at a dc bias of approximately V. Frequency response is controlled by the near-critically damped sensors. The use of gas damping results in very small thermally-induced changes of frequency Model 136 three-channel system, Model 4430A or Oasis 2000 computer-controlled system are recommended as signal conditioner and power Patents 4,574,327, 4,609,968 and 4,999,735 DC response 2 to 100 g full scale Motion, low frequency, tilt 10Kg shock survivabilityModel 7290 AVariable capacitance accelerometerFeaturesDescriptioncmykTHER MAL ZERO SHIFTFro m32 F to 122 F (0 C to 50 C)%FSO [5] Max m-1 3 F to +167 F (-25 C to +75 C)%FSO[5] Max SENSITIVITY SHIFTFro m32 F to 122 F (0 C to +50 C)

3 %Max m-1 3 F to +167 F (-25 C to +75 C)%Max TRANSIENT ERRORE quiv. g/ F< < 06< 06< 06< < < < < <C (Determined by Elec trical clippi ng or Mechanical st ops, whichever is smaller.)091+/57-59+/78-75+/35-91+ + stops, ty pical/minimumg 4 30 90 90 15001<01<01<01<01<s emiTyrevoceRTHRESHOLD (R ESOLUTION)[7]Equiv. g STRAIN SENSITIVITY, MAX[8]Equiv. SUSCEPTIBILITY[9]Equiv. g< < < < < TIME (to within 1%)ms11111 ELECTRICAL ynaotdeilppaebnacegatlovnoitaticxe;egama dtuohtiwmumixamcdV02, ]3[NOITATICXElea d wi thout damageCURRENT DRAIN[10] mA Typ, 10 mA MaxOUTPUT IMPEDANCE/LOAD500 ohms max/10K ohms re sistan ce minimum, F capacitan ce ,pytsmrV ,pytsmrV 001 ESIONLAUDISERPHYSICAL yollamunimuladezidonALAIRETAM,ESACELECTR ICAL, CONNECTI ONSI ntegral cable, four con duct or No.

4 28 AWG, Teflon insulated leads, braide d shie ld,Hyp erflex jacketrebmunlairesdnarebmunledom,ogols'r erutcafunaMNOITACIFITNEDI) (ni-fbl6/swercsgnitnuom3 Mro04-4owtrofseloHEUQROT/GNITNUOM)retem/ smarg31shgiewelbac(smarg11 THGIEWENVI RONMENTALACCELERATION LIMITS (in any direc tion)g00002citatSSinusoidal/Ran domVibration100 g pk, 20 - 2000 Hz/ 40 g rms, 20 - 2000 Hzdna05-,03-ehtrofregnolroces 08,g00001;01-dna2-ehtrofregnolroces 051,g0005)eslupenis-flah(kcohS-100g0005t alacipytOSF% )C 121+otC 55-(F 052+otF 56-gnitarepO)C 051+otC 37-(F 003+otF 001- :5103dohteM,388-DTS-LIMfostnemeriuqer2ss alCsteemtinUYTIVITISNESDSECALIBRATION DATA SUPPLIED)deilppacdV51htiwerutarepmetmoor taderusaem(g/VmYTIVITISNES(at 1g an d 5 Hz for 7290A -2)(at 10g an d 100 Hz for 7290A -10,-30,-50, and -100)FREQUENCY RESPONSE1 to 100 Hz for 7290A -2, 20 to 10 ,00 0 Hz for all other ran gesZERO MEASURAND OUTPUTmVMAXIMUM TRANSVERSE SENSITIVI TY%of sensitivityINCLUDED ACCESSORIESEHW265(2) SIZE 4, FLAT WASHERSEH702(2) 4-40 X 7/16 INCH CAP SCREWSEHM464(1 )

5 HEX WRENCHOPTIONAL ACCESSORIES7990 TRIAXIAL MOUNTING BLOCKIM729 0 AINSTRUCTION range, 7290A -XXM30, available on special is nominally 4 enc e frequency is 5Hz on the 2 g ra the excitation range to Vdc. For the 50 g unit,sensitivi ty changes + typical an d zero measurandoutpu t change s mV/V ty freq uency response avail able on specia l order toext en d to 0-900 Hz for 7290A -10, 0-1500 Hz for 7290A -3 0,an d 0-2000 Hz for Full scale output (FSO) is nominally 4 1%is typi cal. 1%maxim umavail able on special THRESHOLD =MAX. RESIDUALNOISE; 10 0 HzSENSITIVITY8. Per ISA at 250 Mi cro At 100 Gauss, 60 Current drain in cre ases slightly wi th incr easing excitation; typi-cal change is +.

6 06 mA per volt to Maintain high levels of precision and accuracy usin g Endevco'sfact or y calibration services. Call Endevco s inside sales forceat 80 0-982-6732 for recommended intervals, pr icing and turn-around time for these ser vices as well as for quotations on ourstandard : Tighter specification s avai lable on special Endevcomaintainsa programofcon-stantsurveillanceoverallpro ductstoensurea highlevelofreliability. Thisprogramincludesattentiontoreliabilit yfactorsduringproductdesign,thesupportof stringentQualityControlrequirements, , CHARACTERISTICS:All value s ar e typical at +75 F (+24 C), 100 Hz an d 15 Vdc excitation unless othe rwise stated.

7 Calibr ation data, traceableto the National Institute of Standards, (N IST), is ENDEVCOCORPORATION. ALL RIGHTS RESERVED30700 RANCHOVIEJOROAD,SANJUANCAPISTRANO,CA9267 5 USA(800)982-6732 (949)493-8181fax(949)661-7231 Email: 7290 AVariable capacitance accelerometerAPPLIES TO CALIFORNIA FACILITY cmyk