Specification – Casella CEL CEL-269 User Manual

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990020

C4963/2 CABLE

LEVEL RECORDER

TAPE RECORDER

When L

(Equivalent Noise Level Measure-

ment) mode is selected the current L

calculated by the microprocessor will be

displayed and updated every half second.

Press the RESET button to clear the L

display for the next measurement.

8. Time-weighting Selection

Select F (fast response) when it is necessary to

follow the variation of noise levels.

Select S (slow response) when the general

sound levels are relatively constant.

Select I (impulse response) for more rapidly

varying noise when it is necessary to investi-

gate the impulsive components.

This setting has a fast rise time to capture the

level, with a slow decay that allows it to be

displayed for approximately 1.5 seconds.

9. Switch the instrument OFF (RESPONSE switch

to OFF) when not in use; remove batteries

when out of service for long periods.

USE WITH RECORDERS

Connection for tape recorders and graphic level

recorders is made via the same 3.5 mm 3-pole

coaxial socket in the bottom of the instrument, as

shown.

Connection between the sound level meter and

recorder is made via a C4963/2 (2 m) Cable

terminated with a BNC plug. The connections in

this cable provide a conditioned a.c output signal

proportional to indicated sound level, with 7.25 V

RMS full scale deflection.

When recordings are to be made, it is

recommened that the sound level meter be

calibrated as described above, and that a

calibration level be incorporated into the

recording. For more precise details refer to the

relevant recorder handbook.

Specification

Type:

Sound level meter according to ANSI S1.4 Type

2A, IEC 651 Type 2, and BS 5969 Type 2.

Impulse sound level meter according to IEC 651

Type 2I.

Integrating averaging sound level meter according

to IEC 804 and BS 6698.

Dynamic range:

70 dB.

Typical instrument frequency range:

(within +0.5 to -3 dB)

Better than 10 Hz to 25 kHz in all ranges.

Accuracy: (under reference conditions)

1 dB.

Lowest frequency for non-linear

distortion <1 dB:

5 Hz.