by Jason » Thu Mar 13, 2008 1:49 pm
The 4.4 is a net offset. By default the Leica is set to -34.4. If you use a -30 prism, the net offset is 4.4 which is what that is set for. If you are setting -30, you are setting it incorrectly.
From the SurvCE Manual
"Here is the list of standard prism offsets.
Note that Leica prisms default zero to equate to -34.4 mm. So a prism
offset of 34.4 equals a zero "net" offset. Whenever a prism constant is
changed, a note is written to the raw (RW5) file. When you select one of
the prisms from the list (Circle, Mini,etc), THE VALUE THAT IS SHOWN IN
PARENTHESIS IS THE ACTUAL VALUE SET TO THE INSTRUMENT. i.e. 0.0 for
Circular, 17.5 for Mini, 4.4 mini(360). If you select "30mm" or "40mm", we send - 4.4 and
5.6 respectively (30-34.4 and 40- 34.4). The user may also type in any
value they choose. In this case, we will send that value exactly,
unmodified, to the instrument."