User's Manual

7.2.1 Working with the laser receiver as a hand-
held unit
1. Press the “On / off” button.
2. Hold the PRA 35 in the plane of the rotating laser
beam.
The laser beam is indicated by visual and audible
signals.
7.2.2 Using the PRA 35 in the PRA 80 receiver
holder 
1. Open the catch on the PRA 80.
2. Place the PRA 35 in the PRA 80 receiver holder.
3. Close the catch on the PRA 80.
4. Switch the laser receiver on by pressing the “On
/ off” button.
5. Turn the rotating grip to the open position.
6. Fit the PRA 80 receiver holder onto the telescopic
staff or leveling staff and secure it by tightening
the rotating grip.
7. Hold the PRA 35 with the receiving window in the
plane of the rotating laser beam.
The laser beam is indicated by visual and audible
signals.
7.2.3 Working with the PRA 81 height transfer
device 
1. Open the catch on the PRA 81.
2. Insert the PRA 35 laser receiver in the PRA 81
height transfer device.
3. Close the catch on the PRA 81.
4. Switch the PRA 35 on by pressing the “On / off”
button.
5. Position the PRA 35 so that the distance display
shows “0”.
6. Hold the PRA 35 with the receiving window in the
plane of the rotating laser beam.
7. Use the measuring tape to measure the desired
distance.
7.2.4 Menu options
Press the “On / off” button for 2 seconds when
switching the PRA 35 on.
The menu then appears in the display.
Use the measuring units button to select metric or
imperial measuring units.
Use the volume button to assign the more rapid
signal tone to the upper or lower area of the receiving
window.
To save the settings, switch the PRA 35 off.
7.2.5 Setting the measuring unit
The “units” button can be used to set the desired
measuring unit according to the country of use (mm
/ cm / off) or (¹⁄₈in / ¹⁄₁₆in / off).
7.2.6 Setting the volume of the signal tone
The tool is set to “Normal” volume when switched on.
The volume can be adjusted by pressing the “Signal
tone” button. One of the following settings can be
selected: “Low”, “Normal”, “High” or “Off”.
7.2.7 Button lock and confirmation of entries
The button lock function of the PRA 35 prevents
unintentional entries being made and is indicated at
the upper left edge of the display on both sides of the
PRA 35. The lock symbol is either open (unlocked) or
closed (locked). During operation, the command must
be confirmed by pressing the button again in order
to rule out incorrect manipulation. This requirement
for confirmation is indicated in the display but, for
the sake of simplicity, is not mentioned each time in
other sections of the operating instructions.
7.3 Basic functions of the PR 35
The basic functions are horizontal and vertical align-
ment plus working with slopes.
7.3.1 Setting the speed of rotation
NOTE
The speed of rotation can be adjusted by pressing the
“Speed of rotation” button (on the control panel of
the rotating laser or on the PRA 35). The speeds of
rotation are: 300, 600 and >1200 /min. The receiver
works best at 600 /min and should not be used at
speeds of >1200 /min.
7.3.2 Selecting the line function
NOTE
When the “Line” button is pressed, the rotating laser
projects a line which can be lengthened or shortened
by further presses of the button.
NOTE
With the aid of the PRA 35 laser receiver it is also
possible to stop rotation of the laser and to project a
line at the position of the PRA 35. To do this, move
the PRA 35 laser receiver into the plane of the laser
beam and press the “Special line button”.
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