Meggitt Sensing Systems Endevco® Model 7264D very low mass piezoresistive accelerometer

Product catalog summary

Overview: The Endevco model 7264D is a lightweight piezoresistive accelerometer, weighing only 1 gram, designed for applications such as crash testing and rough road testing. It complies with SAEJ211 and SAEJ2570 specifications and serves as a direct replacement for previous models 7264-2000 and 7264C.

Specifications: The accelerometer features an advanced micromachined sensor with integral mechanical stops, offering a resonant frequency greater than 40,000 Hz and a broad frequency response. It has minimal damping, ensuring no phase shift over its useful frequency range, and is suitable for measuring long-duration transient shocks. The device operates with a full bridge circuit and provides a full-scale output of 400 mV with 10 Vdc excitation. It maintains less than 1% transverse sensitivity and a zero measurand output (ZMO) of less than ±25 mV.

Dynamic Characteristics: The model 7264D has a range of ±2000 g, with a typical sensitivity of 0.20 mV/g. Its frequency response ranges from 0 to 6000 Hz, with a damping ratio of 0.005 and non-linearity of ±1% of reading. The accelerometer's zero repeatability after full-scale shock is equivalent to 0.2 g.

Electrical Characteristics: The device requires an excitation voltage between 2.0 to 10 Vdc, with nominal input and output resistances of 600 ohms. It has an insulation resistance of 100 megohms minimum at 100 Vdc.

Physical and Environmental Characteristics: Constructed from black anodized aluminum alloy, the accelerometer includes an integral cable with Teflon-insulated leads. It can withstand static acceleration limits of 10,000 g and sinusoidal vibration up to 1000 g peak below 5 kHz. The operating temperature range is 0˚F to +150˚F, with a storage range of -65˚F to +250˚F.

Calibration and Accessories: Calibration data is provided at 2V, 5V, and 10V excitation voltages. Accessories include an Allen wrench, flat washers, socket head cap screws, and optional items like a triaxial mounting block and shielded cable.

Recommendations: For optimal performance, use with Endevco model 126 and 136 bench-top 3 channel DC amplifiers, or model 436 modular card. Regular calibration services are recommended to maintain precision and accuracy.

Catalog excerpts

Meggitt Sensing Systems Endevco® Model 7264D very low mass piezoresistive accelerometer-1

Model 7264D Piezoresistive accelerometer Features • 40 000 Hz resonant frequency • Mechanical overtravel stops • Small size, rugged • Crash and shock testing • 2000 g full scale range • DC response - long duration transients The Endevco® model 7264D is a very low mass piezoresistive accelerometer weighing only 1 gram. This accelerometer is designed for crash testing, rough road testing and similar applications that require minimal mass loading and a broad frequency response. This accelerometer meets SAEJ211 specifications for instrumentation for impact testing and SAEJ2570 specification for anthromorphic testing. It is a direct replacement for the Endevco model 7264-2000 and 7264C in that the location of the center of seismic mass is the same. The model 7264D utilizes an advanced micromachined sensor which includes integral mechanical stops. This model has a greatly improved resonant frequency ( >40 000 Hz) and frequency response which captures more data and avoids spurious noise. The model 7264D has minimum damping, thereby producing no phase shift over the useful frequency range. With a frequency .400 response extending down to dc (steady state acceleration) this .200 (10.16) (5.08) Specified measuring long duration transient accelerometer is ideal for by customer .103 .100 (2.61) (2.54) shocks. 1.25 (31.8) TYP This accelerometer has a full bridge circuit with fixed resistors .25 (6.4) for shunt calibration. Full scale output is 400 mVCASE 10 Vdc with .188 .400 excitation. Each unit performs with < 1% transverse(4.78) sensitivity (10.16) and ZMO of < ± 25 mV. .24 HOUSING Endevco model 126 and 136, bench-top 3 channel DC amplifiers, and model 436, a .305 3 channel DC amplifier modular card are recommended (7.75) as signal conditioner and .295 (7.49) power supply. U.S. Patents 4,498,229 and 4,605,919 apply. CENTER OF SEISMIC MASS DIRECTION OF POSITIVE OUTPUT .100 (2.54) DIA CABLE, 4 COND #32 AWG S.P.C., TEFLON INS, BRAIDED S.P.C., SHIELD, SILICONE RUBBER OUTER JACKET. CENTER OF SEISMIC MASS .071 (1.80) DIA THRU .067 (1.70) DIRECTION OF POSITIVE OUTPUT .100 (2.54) DIA CABLE, 4 COND #32 AWG S.P.C., TEFLON INS, BRAIDED S.P.C., SHIELD, SILICONE RUBBER OUTER JACKET. STANDARD TOLERANCE INCHES (MILLIMETERS) .XX = +/- .03 (.X = +/- .8) .XXX = +/- .010 (.XX = +/- .25) CABLE SHIELD

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Meggitt Sensing Systems Endevco® Model 7264D very low mass piezoresistive accelerometer-2

Piezoresistive accelerometer extreme environments Dynamic characteristics Units Mounted resonance frequency Hz typ l% of reading, to full range) % max Zero repeatability latter full scale shock) Equiv c Zero measurand output mV max Thermal zero shift mV typ Thermal sensitivity shift %/°F typ Warm-up time Base strain sensitivity Iper ISA 37.2 0 250 u strain] Mechanical overtravel stops Electrical characteristics Insulation resistance 100 megohms minimum at 100 Vdc; leads to case, leads to shield, shield to case Physical characteristics Case material Electrical connections Mounting torque Black...

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Meggitt Sensing Systems Endevco® Model 7264D very low mass piezoresistive accelerometer-3

Model 7264D Piezoresistive accelerometer Accessories: (2) 0-80 x3/16 inch socket head cap screw Safety sleeve 4 conductor shielded cable Triaxial mounting block Notes: 1. Measurand at approximately 1 Vdc. 2. The safety sleeve should be kept on unit when not in use to prevent possible handling damage. 3. Maintain high levels of precision and accuracy using Meggitt’s factory calibration services. Call Meggitt’s inside sales force at 800-982-6732 for recommended intervals, pricing and turn-around time for these services as well as for quotations on our standard products. 4. The 7264D is supplied...

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