GPT-3000 SERIES - FLT Geosystems

17 CHECK AND ADJUSTMENT[Example]Lower side of prism 90°12'30"Upper side of prism 90°04'30"Average90°08'30"Reading to prism center 90°08'50"Difference 20"If the difference is more than mentioned value, contact with your Topcon dealer or Topcon.●For non-prism modeIf the instrument is in the hold mode, press the [F4](HOLD) key to release the hold mode.16) Press the [F3](NP/P) key to change the non-prismmode.17) Collimate the center of the prism.18) Press the [F4](hold) key to hold the quantity of thelight.The mark "#" will appear on the right side of thesignal level indicator.19) Repeat above procedure 6 to 15 in the same wayin the non-prism mode.If the difference is within 2', no problem for use.If the difference is more than mentioned value,contact with your Topcon dealer or Topcon.V: 90° 10'10"HR: 00° 04'20"NPSIGNAL:[❙ ❙ ❙ ❙ ❙] #EXIT NP/P HOLDV: 90° 10'10"NHR: 00° 04'20" PSIGNAL:[❙ ❙ ❙ ❙ ❙] #EXIT NP/P HOLD17-4