3.5 Assembly
The CR:800C instruments are supplied fully assembled apart from the MV:200D
Preamplifier for Class 1 instruments and the batteries.
Preamplifier
The Class 1 versions of the CR:800C (CR:811C, CR:821C and CR:831C) are supplied
with a removable preamplifier, the MV:200D. Also, a removable preamplifier may be
fitted as an option to the Class 2 instruments.
This preamplifier must be connected to the Sound Level Meter before the unit is
switched on. This unit is connected to the top of the CR:800C using a locking ring. To
connect the MV:200D Preamplifier, follow the diagram below:
(1) Place the preamplifier into the socket on the Sound Level Meter
(2) Ensure the connector has located into the socket
(3) Tighten the Locking Ring.
Do not cross thread the locking ring. Damage caused by misuse is not covered by the
warranty for the instrument.
Removing the Preamplifier:
Do not twist the preamplifier body. Unscrew the locking ring and pull the preamplifier
from the Sound Level Meter.
Using Microphone Extension Cables
The CR:800C instruments can be used with a microphone extension cable if the
instrument is fitted with the removable preamplifier. If a microphone extension cable is
to be used during a measurement, the instrument must be calibrated with the cable
attached. Connect the microphone extension cable in the same manner as the MV:200D
Preamplifier.
Batteries
The batteries of the CR:800C are located behind the cover on the bottom of the
instrument. Slide the cover to the right hand side to remove and to access the battery
holder. Ensure the instrument is switched off. Remove the battery holder from the
instrument and insert the batteries. The CR:800C instruments uses two AA type
batteries, also known as LR6.
Ensure that the batteries are inserted correctly. DO NOT reverse the polarity
of the batteries as this may cause damage to the instrument.
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