HBK 4231, User Manual

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21 Sound Calibrator Type 4231
User Manual
Chapter 5
Specifications
Sound Calibrator Type 4231
STANDARDS FULFILLED
IEC/EN 60942 (2017), Sound Calibrators
Class 1
ANSI S1.40-2006, Specification and
Verification Procedures for Sound Calibrators
Class LS and Class 1
SPECIFIED MICROPHONE
Size according to IEC 61094-4
1" without adaptor
½" with adapter UC 0210
¼" with adapter DP 0775
SOUND PRESSURE LEVELS
94.0 dB ±0.2 dB (Principal SPL)
114.0 dB ±0.2 dB re. 20

Pa at reference
conditions
FREQUENCY
1 kHz ±0.1%
DISTORTION
<1%
LEVEL STABILITY
Short Term
: Better than 0.02 dB
(as specified in IEC/EN 60942)
One Year: Better than 0.05 dB (

= 96%)
Stabilisation Time: <5 s
REFERENCE CONDITIONS
Temperature:
23 ±3 °C (73 ±5 °F)
Pressure: 101 ±4 kPa
Humidity: 50%,

10% +15% RH
Effective Load Volume: 0.25 cm
3
ENVIRONMENTAL CONDITIONS
Temperature:

10 to 50 °C (14 to 122 °F)
Pressure: 65 to 108 kPa
Humidity: 10 to 90% RH (non-condensing)
Effective Load Volume: 0 to 1.5 cm
3
INFLUENCE OF ENVIRONMENTAL
CONDITIONS
(typical)
Temperature Coefficient: ±0.0015 dB/°C
Pressure Coefficient: +8·10

4
dB/kPa
Humidity Coefficient: 0.001 dB/%RH
NOMINAL EFFECTIVE COUPLER VOLUME:
>200 cm
3
at reference conditions
BATTERIES:
Type:
2 × 1.5 V IEC LR6 ("AA" size)
Lifetime: Typically 200 hours continuous
operation with alkaline batteries at 23 °C
(73 °F)
Battery Check: When Type 4231 stops
working continuously and only operates
when holding in the On/Off button, the
batteries should be replaced
DIMENSIONS
(without case)
Height: 40 mm (1.5")
Width: 72 mm (2.8")
Depth: 72 mm (2.8")
WEIGHT
150 g (0.33 Ib) including batteries