1. INTRODUCTION
The DR7AC is a single channel signal-conditioning unit for use with transducers requiring
AC excitation and synchronous demodulation, producing a DC output voltage or current.
The DR7AC incorporates a DC-DC converter ensuring that the output of the unit is
electrically isolated from the supply.
Units may be master-slaved in systems where carrier frequency beating is a problem.
The unit is housed in a DIN-rail mounting thermoplastic case with recessed screw-clamp
terminals for all connections and 25-turn front-panel-accessible span and zero
adjustments.
All other controls are internal including coarse gain and zero switches, a zero input switch
and jumper links for master/slave setting and excitation frequency setting.
The unit is suitable for use with the complete range of RDP LVDT transducers.
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