Casella CEL CEL-414 - Manual (Page 47)

CEL-275/3, CEL-266/3, CEL-414/3
& CEL-493/3 - Type 1:
Precision Impulse Sound Level Meter
according to IEC 651 Type 1.I,
Precision Sound Level Meter (with
random incidence microphone)
according to ANSI Type S(1)
S1.4-1983.
CEL-275/3, CEL-266/3 & CEL-493/3
- Type 1:
Precision Integrating Sound Level
Meter according to IEC 804 Type 1.
CEL-266/3 & CEL-328/3 - Type 2:
Impulse Sound Level Meter according
to IEC 651 Type 2.I,
Sound Level Meter according to
ANSI Type S(2) S1.4-1983,
Integrating Sound Level Meter
according to IEC 804 Type 2 (not
CEL-328/3E).
Dynamic range:
100 dB: CEL-493/3 only,
60 dB: All other instruments.
Accuracy: (under reference
conditions)
±0.7 dB: Type 1 instruments,
±1.0 dB: Type 2 instruments.
Typical instrument frequency
range for CEL-275/3, CEL-383/3 &
CEL-414/3: (within +0.5 to -3 dB)
80 dB range: 3.5 Hz to 70 kHz,
50 dB range: 3.5 Hz to 40 kHz,
20 dB range: 3.5 Hz to 40 kHz.
Typical instrument frequency
range for CEL-266/3 & CEL-328/3:
(within +0.5 to -3 dB)
80 dB range: 3.5 Hz to 70 kHz,
50 dB range: 3.5 Hz to 50 kHz,
20 dB range: 3.5 Hz to 50 kHz.
Typical instrument frequency range for
CEL-493/3: (within +0.5 to -3 dB)
Hi: 3.5 Hz to 28 kHz,
Med: 3.5 Hz to 28 kHz,
Lo: 3.5 Hz to 28 kHz.
Lowest frequency for non-linear
distortion <1dB:
3.5 Hz.
Microphone
Type 1 Instruments:
CEL-192 Measurement Microphone,
1 ⁄ 2 “ diameter precision capacitor
type, 50 mV/Pa,
Microphone capsule screws on to
CEL-225/3 Preamplifier,
Free field (F) version available for
IEC 651 and IEC 804 measurement,
Random incidence (R) version
available for ANSI Type S(1) S1.4
measurement,
Impedance to be substituted for
microphone: 18 pF..
Type 2 Instruments:
CEL-230 Microphone/Preamplifier
Unit with
1 ⁄ 4 “ diameter pre-polarized
electret microphone, typically
10 mV/Pa,
Microphone capsule permanently
attached to preamplifier,
11.SPECIFICATION
General CEL Sound Level Meters Handbook - Page 43