An electro$-$optical EDM has $f_0=14\mathrm{.}9850MHz,$ carrier wave frequency, ${}_1=0\mathrm{.}900m,$ and The EDM described in Problem $4\mathrm{.}36$ was used under the given atmospheric conditions and with

the ppm correction dial set to $0$ to measure a slope distance of $2,356\mathrm{.}781m.$ Calculate the slope

distance corrected for environmental conditions.

${}_0=20\mathrm{.}00m.$ A slope distance was measured using this instrument at a temperature of $18C$

and an atmospheric pressure of $755\mathrm{.}0$ mmHg $.$ Calculate the ppm correction that should be

entered into the instrument prior to making this measurement.