Casella CEL CEL-160 - Manual (Page 5)

The CEL-160 Level 2 is also provided as a
complete sound and vibration measuring and
analysing kit under the part number
CEL-160/K1. This comprises all the items listed
above including the CEL-196 and its associated
connection cables.
2.2 Preparing the Instrument for Service
2.2.1 Batteries
The batteries must be inserted into the battery
compartment that is located on the right hand
side of the instrument with the positive
connection outwards. Having inserted all five
cells with the same polarity the battery cover
should be replaced. If the alkaline manganese
batteries are being used the instrument is
ready for operation. However, it must be
remembered that the NiCad cells are delivered
having residual charge only and they should
therefore be charged before using the
CEL-160 (See section 2.2.2). It is advisable to
remove batteries from the recorder if it is to be
stored for any period of time.
The preferred batteries are the
CEL-3731 NiCad cells. If the RS 591-231 cells
are used there are certain operation limitations.
The internal resistance of the alkaline
manganese cells will not accommodate the
high start up current required at high paper
speeds and will cause deregulation of the
power supplies.
This would be most noticeable on the
transient capture and RTA modes; however,
for most general purpose applications it is
possible to take advantage of the lower cost of
the alkaline batteries.
2.2.2 CEL-3732 AC Adaptor and Battery
Charger
This should be connected to the 220-240 V,
50 Hz mains supply and connected to the
socket on the recorder marked 'power' using
the cable provided that is marked 'voltage'. As
this cable is connected the internal batteries
are disconnected. To operate the CEL-160
from the mains no further connection is
necessary. When it is required to charge the
internal batteries the CEL-160 should be
switched off and the charger connected to the
recorder with the cable marked 'current'. Note
that the alkaline manganese cells must not be
used in conjunction with the CEL-3732
charging unit.
A fully discharged set of NiCad batteries
will take in the order of 12 hours to recharge;
the charger unit is fully regulated and it is not
possible to damage the cells by overcharging.
The front panel indicator fitted to the charger is
provided for charging indication only, and will
remain unlit when operating the recorder with
the 'voltage' cable. To operate the CEL-3732
on 100 - 120V, 60Hz mains supplies the
voltage tap on the transformer primary should
be reset following the instructions marked on
the transformer fitted to the unit.
2.2.3 Loading the Chart Rolls
Chart rolls locate in the compartment on the
top face of the recorder. When opening this
compartment care must be taken to ensure
that the writing comb disengages from the
rubber drive roller.
This is achieved by pressing the front of
the plastic cover towards the back of the
instrument and raising it a few degrees until
the bias springs allow it to move forward
again; it may then be simply hinged open. The
chart roll may now be placed in the tray with a
short section unrolled and placed over the
drive roller, the cover may then be closed
following the reverse procedure ensuring that
the chart is squarely located between the
writing comb and the drive roller. Chart rolls
are supplied by CEL in packs of nine under the
part number CEL-3730.
2.2.4 Input Signals
The CEL-160 is primarily intended for use with
the CEL-2980 preamplifier in conjunction with
the CEL-186/2F microphone, this combination
is connected by means of the CEL-3686 cable.
Alternatively it will accept either
conditioned or unconditioned signals from
sound or vibration level meters. Log DC inputs
may also be connected to the instrument. The
procedures for these modes are outlined in
Section 4 of this manual.
2.2.5 Routine Maintenance
Accepted practices relating to Electronic
Instruments should apply to this equipment
especially in relation to the batteries. From
time to time the debris resulting from the
spark errosion of the chart paper will need to
be removed from the paper tray and also
brushed out of the writing comb. That in the
tray can be dusted out whilst a brush is
CEL-160 Graphic Recorder - Page 5