TM 5-3895-374-24-2BULLETIN E-77MODEL A-701 DIGITAL READOUTINSTALLATION AND OPERATING INSTRUCTIONSSPECIFICATIONSCaseStandard 118 DINAccuracy± 0.05% of readingConversion Rate3 readings/sec.Characters0.6" LED, 31/2 digitInput Impedance1000 Meg OHMPower Required120 VACPower Consumption6 wattsIntegral Power Supply24 VDC, 50mAWeight12 oz.INSTALLATION1) Case is standard 1/8 DIN size. To panel mount,cut a 3.6" x 1.675" (92mm x 43mm) opening.See figure A.2) Remove front panel filter. Insert screwdriverblade in slot at bottom to release catch andgently pry outward.3) Insert A-701 Digital Readout in panel openingand install retainer plate from rear.4) Slide mounting screws through reinforcing clipsand then through holes in readout case. Threadinto tapped holes in retainer plate and tightenuntil unit is secure.CALIBRATION PROCEDUREStandard units are factory calibrated to read 00.0 with4mA DC input and 100.0 with 20mA DC input, thusindicating percentage of full range pressure ortemperature being sensed by the companion transmitter.To adjust for other full range values from 500 to 1999use the following procedure.FIGURE A1) Connect the readout in a current loop with anaccurate milliammeter and a current source.2) With front panel filter removed, apply 4mA DCloop current and adjust zero control for "00.0"reading.3) Apply 20mA DC loop current and adjust spancontrol for full span reading. If unable to reachrequired reading it may be necessary to adjustcoarse span control located internally behind thespan and zero controls. Disconnect electricalconnector and slide internal assembly out to gainaccess to this setting.DECIMAL LOCATIONTo change the location of the decimal point, install ajumper from decimal common point to appropriateterminal directly below the new position selected. Seefigure B.FIGURE B(page 3-713)
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