Casella CEL CEL-160 - Manual (Page 4)

1. Introduction
The CEL-160 represents a completely new
concept in instrumentation for the
measurement of sound and vibration. It
enhances the latest techniques to provide the
most convenient system for documenting
results.
An all-electronic writing system is
employed and hence there are no moving
parts to limit the writing speed. In practice, the
CEL-160 can accurately write levels which
have time constants as short as 10 Ms and
print actual waveforms up to 10 kHz. The
complete system is microprocessor controlled
and is programmed to print its own
measurement graticule as it records; full trace
annotation is provided allowing the time axis to
be read directly without the need for complex
measurement and calculation based upon
chart length. Inputs may be AC or DC signals
and these may be recorded as either
waveforms or levels with the RMS detector
having its time constant selected as either
10 mS, 125 mS (F), 1 S (S) or 10 S and its
output in either linear or logarithmic units. The
software provides for operation with a wide
range of serial and real time frequency
analyzers with; in the former case, a
subroutine that optimises the 'bandwidth-time
constant' product and in the latter full
alphanumeric annotation of each band level.
CEL-160 Graphic Recorders are available
in two basic hardware configurations that allow
for increasing data storage and higher levels of
programming. In addition to the facilities
provided by the basic unit as described above
the 'Program Level 2' option has the capacity
to operate in an expanded trace mode when
making RMS recording or in a transient capture
mode when making waveform recordings. It
also has provision for one customer specified
program package a few of which could be:
calculation of reverbration times (RT 60 ),
calculation of period L eq or estimation of
hearing protector attenuation.
The CEL-160 incorporates a full
specification sound level meter to IEC 651
Type 1 (BS 6959 Type 1, ANSI S1.4 Type 1 and
DIN 45 633) and it is only necessary to add a
CEL-2980 preamplifier, connecting cable and
transducer to be able to make direct
recordings.
2. Commissioning
2.1 Schedule of Parts
The description CEL-160 Graphic Recorder
complete refers to the following items and on
receipt, the instrument should be checked
against this schedule. Items supplied are
common to both versions.
CEL-160 Graphic Recorder
RS 591-231 Battery Pack (set of five alkaline
manganese C cells)
CEL-3730 Pack of nine rolls of chart paper
RS-1 Screwdriver
CEL-3843 Writing comb brush
060019 Handbook
CEL-3876 Rule
In addition to the standard items listed above,
there are a number of optional items and
although provision for some of these is made
in the standard transit pack they are only
provided if specifically requested. Such items
will be detailed separately on invoices and
advice notes. The most popular of these items
are as follows.
Accessories
CEL-3729 Ever Ready Carrying Case for
CEL-160
CEL-3731 Rechargeable Battery Pack
(NiCad)
CEL-3732 AC Adaptor and Battery Charger
CEL-2980 Preamplifier
CEL-186/2F Precision Measurement
Microphone
CEL-3686/2 Cable CEL-2980 to CEL-160 -
2 metres
CEL-2962 Windshield for CEL-186/2
CT-3 Tripod (accepts CEL-2980
Preamplifier)
CEL-3025 Vibration Adaption Kit
(comprises accelerometer and
mounting kit, connection
cable, passive integrator and
slide rule).
Ancillary Instruments
CEL-177 Precision Acoustic Calibrator
CEL-196 Automatic Third Octave
Analyser
CEL-3789 Ever Ready Case for CEL-196
(fits to CEL-3729)
Page 4 - CEL-160 Graphic Recorder