Sokkia SDL30 Operator's Manual page 24

(Continued from previous page)
• If waterdrops or dirt adhere to the barcode, measurement may be
impossible. Wipe the staff clean with a soft cloth.
• Clean the staff if grit or dirt gets stuck between the sections. If the
staff is dirty, measurements will not be very accurate.
• Avoid scratching or soiling the barcode surface as this could
make measurement impossible. Store and carry the staff inside
its case.
• If the BGS series staff is used for leveling, and the height
difference and temperature difference are much larger than
normal, temperature variations may cause the staff to expand or
contract and cause differences in relative height measurements.
SDL30/50 reads in measurements up to 0.1mm and minor
deviations in the accuracy of the staff will adversely affect
accuracy. To obtain high accuracy measurements, it is important
to perform temperature corrections for the staff. (See the Note
below for details.)
• Setting up the staff
Procedure
1 Connect the staffs correctly by making sure the numbers on the
numeric scale side of the staffs run in unbroken order.
2 Set the foot plate on the ground so that the staff will not sink.
3 Keeping an eye on the circular bubble scope on the staff, set the
staff in the foot plate so that it stands up straight.
4 Turn the barcode scale toward the instrument.
23