endevco model 7596a variable capacitance accelerometer model 7596a ? economical and rugged ? 2 to 100 g full scale ? dc response ? gas damped sensor ? mechanical over-range stops description the endevco ? model 7596a valuline ? accelerometer family is a low cost solution to low-level, low frequency measurements. applications include labora- tory measurements, ground transportation studies and mea- surements where the accelerometer will be subjected to high shock levels (up to 10 000 gs, see speci?ations). the 7596a is ideal for modal studies on large structures. gas damping and internal overange stops enable the anisotropically etched silicon microsensors to withstand high shocks and acceleration loads. the use of gas damp- ing, in the sensor, results in very small-induced changes of frequency response. the patented sensor design ensures immediate stability making the unit ready to take accurate dc or dynamic data within one millisecond! the 7596a can operate from 8.5vdc to 30vdc and pro- vide a high level, low impedance output. the output is high enough to drive most laboratory instruments, tape recorders and data acquisition systems without ampli?a- tion or signal conditioning. the output can be fed into either a differential or single-ended ampli?r or standard bridge electronics with 10vdc excitation. endevco model 136 three-channel system, model 4430a or oasis computer-controlled system are recommended signal conditioners. specifications performance characteristics: all values are typical at +75 (+24? and 15 vdc excitation unless otherwise stated. calibration data, traceable to the national institute of standards, (nist), is supplied. units 7596-2 -10 -30 -50 -100 range g pk 2 10 30 50 100 sensitivity (at 100 hz) [1] [2] mv/g 1000 100 200 20 66 8 40 4 20 2 frequency response ( 5%) hz 0 to 15 0 to 500 0 to 800 0 to 1000 0 to 1000 mounted resonance frequency hz 1300 3000 5500 5500 6000 non-linearity and hysteresis [3] % fso typ 0.20 0.20 0.20 0.2 1 % fso (max) 0.50 0.50 0.50 0.5 2 transverse sensitivity [4] % typ 1 1 1 1 1 zero measurand output [2] mv max 200 200 200 200 200 damping ratio 3.0 0.7 0.7 0.6 0.6 damping ratio change %/ +0.04 +0.04 +0.04 +0.04 +0.04 from -65 to +250?( -5- c to +121) %/ +0.08 +0.08 +0.08 +0.08 +0.08 actual size applies to california facility
endevco model 7596a variable capacitance accelerometer specificationsontinued performance characteristicsontinued accessories (included) ehw265 (2) size 4, flat washers eh409 (2) 4-40 x 3/8 inch cap screws ehm464 (1) hex wrench optional accessories 24328 4 conductor shielded cable 7990 triaxial mounting block notes 1. reference frequency is 20 hz on the 2 g range. 2. over the excitation range 8.5 to 30 vdc. sensitivity changes +0.1%/v typical and zero measurand output changes -0.5 mv/v typical. 3. full scale output (fso) is nominally 4 volts. 4. 1% is typical. 1% maximum available on special order. 5. threshold = max. residual noise; 0.5 t o 100 hz sensitivity 6. per isa 37.2 at 250 microstrain. 7. at 100 gauss, 60 hz. 8. current drain increases slightly with increasing excitation; typi- cal change is +.06 ma per volt from 8.5 to 30 vdc. 9. maintain high levels of precision and accuracy using endevco's factory calibration services. call endevcos inside sales force at 800-982-6732 for recommended intervals, pric- ing and turn-around time for these services as well as for quo-tations on our standard products. units 7596-2 -10 -30 -50 -100 thermal zero shift from 32 to 122?(0 to 50? % fso max 2.0 2.0 2.0 2.0 2.0 from -13 to +167?(-2- to +75? % fso max 4.0 4.0 4.0 4.0 4.0 from -65 to +250?(-5- to +121? % fso max 6.0 6.0 6.0 6.0 6.0 thermal sensitivity shift from 32 to 122?(0 to +50? % max 2.0 2.0 2.0 2.0 2.0 from -13 to +167?(-2- to +75? % max 4.0 4.0 4.0 4.0 6.0 from -65 to +250?(-5- to +121? % max 6.0 6.0 6.0 6.0 6.0 thermal transient error equiv. g/ < 0.0006 < 0.0006 < 0.0006 < 0.0006 < 0.0006 per isa rp 37.2 equiv. g/ < 0.001 < 0.001 < 0.001 <0.001 < 0.001 overrange (determined by electrical clipping or mechanical stops, whichever is smaller.) electrical clipping g -3.5/+3.8 -18/+19 -53/+57 -87/+95 -175/+190 mechanical stops, typical g 4 30 90 200 200 recovery time s < 10 < 10 < 10 < 10 < 10 threshold (resolution) [5] equiv. gs 0.0005 0.0025 0.008 0.0012 0.025 base strain sensitivity, max [6] equiv. gs 0.01 0.01 0.01 0.01 0.01 magnetic susceptibility [7] equiv. gs < 1 < 1 < 1 < 1 < 0.1 warm-up time (to within 1%) ms 10 10 10 10 10 electrical excitation [2] 8.5 to 30 vdc, 32 vdc maximum without damage; excitation voltage can be applied to any lead without damage current drain [8] 4.5 ma typ, 8 ma max output impedance/load 50 ohms max/10k ohms resistance minimum, 0.1 f capacitance maximum residual noise 100 v rms typ, 0.5 to 100 hz. 500 v rms typ, 0.5 hz to 10 khz isolation 100 m physical case, material/base anodized aluminum alloy electrical, connections 28 awg silver plated alloy 135, pfa340 te?n insulated conductors, spiral shield (spc), hyperflex ? jacket with tfe non-fray, end grip 30 3 inches (760 76mm) long. mounting/torque two 4-40 x 3/8 6 lbf-in (0.7 nm) weight 10 grams (cable weighs 9 grams/meter) environmental acceleration limits (in any direction) static 20 000 g sinusoidal/random vibration 100 g pk, 20 - 2000 hz/40 g rms, 20 - 2000 hz shock (half-sine pulse) 5000 g, 150 sec or longer for the -2 and -10; 10 000 g, 80 sec or longer for the -30 and -100 zero shift 0.1% fso typical at 5000 g temperature operating -65 to +250?(-5-? o +121?) storage -100 to +300?(-7-? o +150?) humidity/altitude unaffected. unit is epoxy sealed. hybrid and sensor are hermetically sealed/unaffected. esd sensitivity unit meets class 3 requirements of mil-std-883 calibration data supplied (noted on shipping box) sensitivity (at 5 hz and 1 g pk, for 2 g range) (at 100 hz and 10 g pk, all other ranges) mv/g with 15 vdc excitation frequency response 1 to 100 hz for 7596a-2, 20 to 10000 hz for all other ranges zero measurand output mv maximum transverse sensitivity % of sensitivity continued product improvement necessitates that endevco reserve the right to modify these speci?ations without notice. endevco maintains a program of con- stant surveillance over all products to ensure a high level of reliability. this program includes attention to reliability factors during product design, the support of stringent quality control requirements, and compulsory corrective action procedures. these measures, together with conservative speci?ations have made the name endevco synonymous with reliability. endevco corporation, 30700 rancho viejo road, san juan capistrano, ca 92675 usa (800) 982-6732 (949) 493-8181 fax (949) 661-7231 www.endevco.com email:applications@endevco.com 0603 rev c
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