Norsonic nor140, Instructional Manual

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10
Chapter 2
Taking a closer look
Taking a closer look at
the instrument
You may have to assemble the instrument the first time
you use it. Be sure to take utmost care when mounting
the microphone cartridge onto the preamplifier.
Always keep the preamplifier disconnected when-
ever you are screwing the cartridge onto the preamp-
lifier and screw only finger tight!
The instrument is powered from four AA size
batteries which are inserted as shown below. If you use
rechargeable batteries, these will not be recharged if
you connect the Nor140 to an external power supply.
Switching ON/OFF
The instrument is toggled ON/OFF by pressing the
right, lower key. Note that the key has to be pressed
down for more than one second for switching the
instrument OFF.
On the use of batteries
The Nor140 comes with four AA batteries (1.5 V each).
Battery lifetime is typically 8–12 hours (depends on
measurement mode and brand of batteries). If you
switch to lithium batteries the life time will increase to
15–20 hours. The use of alkaline or lithium batteries is
strongly recommended to avoid leakage.
Rechargeable batteries may also be used, but
with reduced operating time. Connecting an external
DC-source (11–16V) to the instrument will not charge
rechargeable batteries, but power the instrument
in
lieu
of the internal batteries.
The internal calendar/clock is powered by the
normal batteries even when the instrument is switched
off. A charged capacitor supplies the needed current
during the time for changing batteries.
Data is stored in a non-volatile memory and need
no power for retaining the information.
Example of batteries inserted correctly