The T703 offers the user a choice of 16 overlapping input ranges which are field selectable via top-accessed DIP switches (see Table 1). The T703 isolating two-wire transmitter can accept input voltage spans from 20mV to 200 volts and input current spans from 1mA to 50mA. Bipolar selection modifies the unipolar range to include a negative offset (e.g. 200V becomes 100V). The T703 provides 1000Vrms of transformer-coupled isolation and 120VAC continuous input overload protection. The top-mounted super bright LED illuminates when the loop current is above 3.3mA. Standard surface mount RFI filters reject walkie-talkie interference and noise. Current output is in proportion to the selected voltage or current input.

A major advantage of the T703 is its truly wide-ranging capability. The T703 enables 80% zero turn-up P and 80% span turn-down p adjustments within any user-selected input range. For example, Range 11 of Table 1 specifies 0 to 100V with a minimum span of 20V (100V - 20V = 80V, or 80%). This 80% adjustability allows the user to field-calibrate the unit for the maximum (0 to 100V) down to any minimum (20V) span (e.g. 25V to 45V)--as long as that adjusted span remains within the selected 0 to 100V range. The same is true for any adjustable span, minimum or otherwise, in any user-selectable range: all spans are field adjustable from 20% (minimum span) to 100% of the specified range.