Norsonic Nor265, User Manual

Page: 15 / 32

Nor265 User Guide
Norsonic AS
15
5.3 Boom operation
Mount
N o r 2 6 5
as described in section 4 Assembling the Nor265.
Normally the device is mounted in the tripod when used as a
microphone boom.
Mount the boom with counterweight. Mount the measurement
microphone in the end of the rod. An ordinary microphone cable like
Nor1408 is normally used
between the microphone
preamplifier and the sound level
meter. The cable may be fed
through the hollow shaft as
shown on the figure
Adjust the length of the rod in
accordance with your
requirements. The rod is
telescopic with two parts. Loosen
the outer part where the microphone is mounted by turning it anti-
clockwise as seen from the microphone end. Pull it out to the required
length, and fasten it by turning it clockwise.
A counterweight has to be placed opposite to the microphone to
balance the rod about the turning point. We recommend doing this
before the power is switched on in order to allow the shaft to rotate
freely. Turn the body so the main shaft is horizontal, and adjust the
position of the counterweight until the rod with the microphone is in
balance as shown on the figure below.
Switch on the device. If you want to use the fixed reference angle,
turn the switch to the position "Go home".
Wait until the LED marked
"Go home" lights continuously.
Select the appropriate sweep range and time by turning the rotary
switch to the corresponding position as indicated on the front panel.
Note that the operation for the various positions may be redefined.
See section
7 Modifying the user interface for further information.
The torque for the device is limited and the device will not be harmed
if its movement is blocked. You may even turn the device by hand to
obtain a suitable reference angle. However, any calibrated home
position will then be lost.
The motor will try to keep the boom in the required position with a
torque similar to a spring force. The inertia of the boom and this
spring force will have a distinct resonance frequency. Adjust the
Loosen the outer part of the rod,
adjust the length and fasten
afterwards.