Casella-cel CEL-278 Bedienungsanleitung

CEL-278/2 OCTAVE FILTER SET Operator's Handbook PP60024 Issue: 2 August 1990 CEL Instruments Ltd. CEL-278/2 Handbook Page 1

On "Hi" range the input signal passes directly to the anti-aliasing filter and thence to the selected octave filter. On "Lo" range

Figure 2 Typical octave filter response curve pressed, or band step control signals are received via the bottom connector from an external device su

battery voltage falls to an unusable level, and whether an overload condition is occurring. Figure 3 shows the full annotation provided by the display

Figure 3 Control panel and display showing all indicators (Normally, all indicators will not be displayed at the same time) placed, or the external

Normally when the Filter Set is used with CEL sound level meters, (except for the CEL-493/2 series), the CEL-278/2 RANGE switch is set to "Hi&quo

When the button is pressed while standing in the highest frequency filter band, the instrument returns to the 'All Pass" band. Conversely

1. Conditioned AC signals up to 8.0V RMS, 11.3Vpk with a minimum load impedance of 10kΩ output via line 6 of the top connector, and line 4 of the bot

3.6 Batteries & Auxiliary Power Supplies The CEL-278/2 is designed to operate with the set of four manganese alkaline batteries (IEC Type LR6 (AA

Incorrect installation, handling, operation, and disposal of batteries can be dangerous. Follow the battery manufacturer's recommendations, and i

4. PREPARATION FOR USE The CEL-278/2 is fully tested and calibrated in accordance with the requirements of its specification before it is dispatched

Page 2 CEL-278/2 Handbook CEL Instruments Ltd

When a set of batteries has been loaded, check their power output by sliding the RANGE switch to "On" to ensure that LOW BAT is not indicate

5. OPERATION The Filter Set can be used for frequency analysis only when connected to a suitable measuring instrument, and both must have power avail

Figure 7 Attaching the filter set close coupled to a CEL sound level meter Ensure that the locking screw is correctly aligned with the bush in th

Figure 8 Interconnection with other CEL measuring and recording instruments CEL Instruments Ltd. CEL-278/2 Handbook Page 23

Warning Remove batteries from both Filter Set and Sound Level Meter if they are to be powered by an external supply. Alternatively, connect the ins

5.2 Manual and Remotely Scanned Octave Band Frequency Analysis When the CEL-278/2 is connected to a sound level meter, any noise (or vibration) param

The Instruments are now set so that the instructions given in the level recorder handbook can be followed to set up and record spectrums, with freque

6. SPECIFICATION Filter bands: 11 Octave filter bands according to IEC 225 and ANSI S1.11-1966 (R1975) Class II, C-weighted network according to Typ

Typical noise floor: (measured on Lo range with a CEL-493/2 Sound Level Meter) Filter Set All pass: (WTNG and band position) Linear A-weighted 2

Max output voltage: 8.0V RMS signal (26Vpk-pk under overload conditions), Output impedance: <1kΩ, Recommended input impedance of output device 10

Contents Page 1. Introduction 5 2. Schedule of parts 7 3. Description 9 3.1 Technical description 9 3.2 Display 11 3.3 Control identities

External power, 3.5 to 8V DC via pins 1 and 2 of auxiliary socket, at 250mA maximum. Typically 100mA at 6V. Batteries: 4 x IEC LR6 Alkaline Mangan

7. MANUFACTURERS SERVICING & WARRANTY ARRANGEMENTS In order to ensure its rigid conformity with the requirements of the specification, the instru

Page 32 CEL-278/2 Handbook CEL Instruments Ltd

8. CALIBRATION CERTIFICATE The CEL-278/2 Octave Band Filter Set described below has been inspected andua!ih/u1edinaocordunoevvbh1herequi,onlentony1ho

Page 34 CEL-278/2 Handbook CEL Instruments Ltd CEL Instruments are designed, manufactured, and serviced by: Lucas CEL Instruments Lt

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1. INTRODUCTION The CEL-278/2 Filter Set was designed to meet the requirement for a portable filter set that allows octave frequency analysis to be pe

The CEL-278/2 may be used with other types of CEL instrumentation, including the following. CEL-160 Graphic Level Recorder (not "C" version

2. SCHEDULE OF PARTS A complete "CEL-278/2 Octave Filter Set" contains the following items. When the instrument is delivered, check that al

Page 8 CEL-278/2 Handbook CEL Instruments Ltd

3. DESCRIPTION 3.1 Technical Description The CEL-278/2 is designed to be mounted close coupled to the bottom of a CEL sound level meter. It receives