Aerospace Energy Test and measurement Isotron® accelerometer Model 7253D Key features • Triaxial, low-impedance output • 360º cable orientation • Low profile • Hermetically sealed • Signal ground isolated from mounting surface • 7253D-10-R and 7253D-100-R available as replacement sensors The Endevco® model 7253D is an Isotron triaxial accelerometer designed for applications requiring the measurement of shock and vibration simultaneously in three mutually perpendicular axes. The Endevco® model 7253D is small and lightweight with a broad frequency response. The thru-hole mounting design allows for 360˚ cable orientation. The unit is hermetically sealed to protect against environmental contamination. The signal ground is isolated from the mounting surface by a hard anodized insulator. The accelerometer is available in two sensitivities, 10 mV/g (7253D-10) and 100 mV/g (7253D-100). Each axis utilizes an Endevco type P-8 shear piezoelectric sensing element in conjunction with a hybrid charge amplifier to provide a low impedance output of ±5 volt full scale in a two wire system IEPE configuration. A constant current excitation of 2 to 20 mA is required for each axis. Electrical connection is made to each axis through a 4-pin connector. The Endevco® model 7253D is ideally suited for applications where the orientation of the connector and sensitive axes are critical. Testing environments include flight testing, aircraft engine testing, industrial engine testing, missile testing, aircraft component testing, spacecraft component testing, and industrial machinery testing.

Aerospace Energy Test and measurement Isotron® accelerometer Model 7253D Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75°F (+24°C), 4 mA, and 100 Hz, unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied. Dynamic characteristics Range Voltage sensitivity Typical Minimum Maximum Frequency response ± 5% ± 10% ± 3 dB Resonance frequency Typical Minimum Sensitivity deviation vs. temperature at +67°F (-55°C) max/min at +257°F (-125°C) max/min Transverse...

Aerospace Energy Test and measurement Isotron® accelerometer Model 7253D Specifications Physical characteristics Units Dimensions Weight grams (oz) Case material Connector Mounting inches Torque (recommended) in-lbs -100 See outline drawing < 10 (0.352) Titanium alloy 6AI-4V 4-pin standard male connector with each axis as identified per outline drawing Clearance hole for 10-32 x 5/8 long mounting screw and washer 18 Calibration Sensitivity mV/g Maximum transverse sensitivity % Frequency response % Accessories Product Triaxial cable, 85ºC, 3 BNC’s at instrumentation end Mounting screw assembly...