MTS600 Instruction Manual
84
11.7 Check the constant of instrument
The additive distance constant of the instrument is adjusted accurately before
delivery, and seldom deviates. The additive distance constant can be checked using
a baseline with a known distance precision. If there is no baseline, perform these
checks as follows.
l
Check
①
Find an area of flat ground where two points 100m apart can be selected. Set
up the instrument at point A and the reflective prism at point B, establish a point C
half way between points A and B.
A
B
C
②
Precisely measure the horizontal distance between point A and point B 10
times and calculate the average value.
③
Place the instrument at point C directly between points A and B and set up the
reflective prism at point A.
④
Precisely measure the horizontal distances CA and CB 10 times each and
calculate the average value for each distance.
⑤
Calculate the additive distance constant as follows
：
K=AB
－
(CA
＋
CB)
K should near equal to 0, if |K| >5mm, it should send to standard base line to
check carefully, then to correct it.
Caution :
Error in setting up the instrument and reflective prism or in sighting the
target will influence the additive distance constant. Be extremely careful to prevent
such errors when performing these procedures. Set up so that the instrument height
and the target height are identical. If a flat place is not available, use an automatic
level to make sure the heights are identical.
l
Adjustment
If K changed not near equal to 0, customer should adjust it by step below:
①
Press [MENU] key on the panel after power on,
enter main menu, press [F3] in the second page of the
menu to select
“
Instr. Adjustment
”
. The screen of
inputting password appears.
Instr.Adjustment
Password
：
OK
