User's Guide ______________________________________________________________________
228 _________________________________________________________________ M210667EN-C
- The main receiver signal is less than 20 % of the expected maximum
receiver signal: The acoustical signal is modulated with a short signal
and a long break in the beat of one second.
- The main receiver signal is between 20 % and 80 % of the expected
maximum receiver signal: The acoustical signal is modulated with a
mid signal and a mid break in the beat of one second.
- The main receiver signal is greater than 80 % of the expected
maximum receiver signal: The acoustical signal is permanent and
uninterrupted.
It is desirable to reach a main receiver signal greater than 40 % of the
expected maximum receiver signal by raw alignment.
If the main receiver signal is lower than 40 %, the horizontal and vertical
position of the transmitter and receiver have to be double-checked.
To double-check the receiver location, do the following:
1.
Place the ladder behind the receiver.
2.
Remove the measurement head cover and check if the transmitter
head image is exactly visible through the sight hole and if the
measurement unit is turned in line with the support unit (refer to
Figure 53 on page 98). If this is not the case, the receiver alignment
has to be improved.
During the following steps, check if the acoustic signal changes to a
longer or permanent signal:
1.
If the transmitter image in the sight hole is shifted left or right,
loosen the two fastening screws of the support unit (lower two hex-
socket screws, size 4, refer to Figure 52 on page 97) and then turn
the support unit slightly until the orientation is perfect.
2.
Tighten the support unit fastening screws.
3.
Loosen the two fastening screws of the receiver measurement unit
(upper two hex-socket screws, size 4, refer to Figure 74 on page
116) and turn it in line with the support unit.
4.
Tighten the measurement unit fastening screws.
5.
If the transmitter image in the sight hole is shifted above or below,
loosen the foundation nuts slightly and turn the front nuts to move
the base plate according to your observation (refer to Figure 66 on
page 111).
6.
Tighten the foundation nuts carefully after you have finished.
7.
Re-install the measurement head cover.
8.
If the receiver alignment check did not come to a sufficient result,
the raw alignment of the transmitter has to be checked as well.