di-8b45 frequency input modules features ? accepts frequency input signals 0 to 100khz ? ttl or zero-crossing signal inputs ? high level voltage outputs ? 1500vrms transformer isolation ? ansi/ieee c37.90.1 transient pro - tection ? input protected up to 240vac con - tinuous ? 100db cmr ? 70db nmr at 60hz ? 0.10% accuracy ? 0.05% linearity ? low drift with ambient temperature ? ul, csa, fm and ce certifications pending ? mix and match module types description di-8b modules are an optimal solution for monitoring real-world process signals and providing high level signals to a data acquisition system. each di-8b45 module isolates and conditions a frequency input signal and provides an analog voltage output. the frequency input signal can be either a ttl level or zero crossing with as little as 100mv amplitude. input circuitry for each signal type has built-in hysteresis to prevent spurious noise from corrupting the module output. ttl signals are applied to the + and - terminals while zero crossing signals are applied to the +exc and - ter - minals. reference the block diagram (p 2). a 5v excitation is available for use with magnetic pick-up or contact closure type sensors. the excitation is available on the - exc terminal with return on the - terminal. a special input circuit on the di-8b45 modules provides protection against ac - cidental connection of power-line voltages up to 240vac. clamp circuits on the i/o and power terminals protect against harm - ful transients. isolation is provided by optical coupling to suppress transmission of common mode spikes or surges. the module is powered from +5vdc, 5%. the modules are designed for installation in class i, division 2 hazardous locations and have a high level of immunity to envi - ronmental noise. specifications typical at t a = +25oc and +5v power di-8b45 input range 0hz to 100khz input threshold minimum input maximum input minimum pulse width ttl input low ttl input high zero crossing 200mvp-p 350vp-p ttl, 170vp-p zero crossing 4s 0.8v max 2.4v min input hysteresis zero crossing ttl 50mv 1.5v input resistance normal power off overload 200k? 200k? 200k? input protection continuous1 transient 240vrms max ansi/ieee c37.90.1 excitation +5v at 8ma max cmv, input to output continuous transient 1500vrms max ansi/ieee c37.90.1 cmr (50hz or 60hz) 100db accuracy2 0.10% span nonlinearity 0.05% span stability offset gain 25ppm/oc 100ppm/oc noise output ripple <10mvp-p at input >2% span response time, 90% span 300ms (-01); 175ms (-02); 50ms (-03); 30ms (-04); 30ms (-05); 15ms (-06); 15ms (-07); 2ms (-08) output range 0 to +5v output protection transient continuous short to ground ansi/ieee c37.90.1 power supply voltage +5vdc 5% power supply current 110ma power supply sensitivity 50ppm/% mechanical dimensions 1.11" 1.65" 0.40" (28.1mm 41.9mm 10.2mm) environmental operating temperature storage temperature relative humidity -40oc to +85oc -40oc to +85oc 0 to 95% noncondensing 1240vac between + and -/+exc/-exc terminals. 120vac between - and +exc/- exc terminals and between +exc and -exc terminals. 2includes nonlinearity, hysteresis, and repeatability. dataq instruments, inc. ? 241 springside drive ? akron, ohio 44333 ? tel: 330-668-1444 ? email: support@dataq.co m ? www.dataq.co m
block diagram di-8b45 frequency input modules ordering information model number input range DI-8B45-01 0hz to 500hz di-8b45-02 0hz to 1khz di-8b45-03 0hz to 2.5khz di-8b45-04 0hz to 5khz di-8b45-05 0hz to 10khz di-8b45-06 0hz to 25khz di-8b45-07 0hz to 50khz di-8b45-08 0hz to 100khz the information on this data sheet is subject to change without notice. dataq and the dataq logo are registered trademarks of dataq instruments, inc. all rights reserved. copyright ? 2005 dataq instruments, inc. data acquisition product links click on tet to ump to page data acquisitio n | data logge r | chart recorder | thermocoupl e | oscilloscop e pringside drie aron ohio
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