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Bruel & Kjaer 2238 Mediator, Class 1 Integrating Sound Level Meters
Specifications apply to 2238 Mediator fitted with the standard
microphone and preamplifier
STANDARDS
Conforms with the following:
- IEC 60651 Type 1, 1979 & Amendment 1 1993 & Amendment 2 2000
- IEC/EN 61672 – Draft March 1998 Class 1
- EN60651 Type 1
- EN60804 Type 1
- ANSI S1.4 –1983 Type S1
- ANSI S1.43 – 1997 Type 1
SUPPLIED MICROPHONE
Type 4188 Prepolarized Free-field 1/2" Condenser Microphone
Nominal Sensitivity: –30 dB re 1 V/Pa or 31.6 mV/Pa
Frequency Range: 8Hz–16 kHz ±2dB
Capacitance: 12 pF
MICROPHONE PREAMPLIFIER
ZC 0030
Extension Cables: Available in lengths of 3m and 10 m. No
recalibration is required
MEASURING RANGES
Dynamic Range: 80 dB, adjustable to give full-scale readings from
80 to 140 dB in 10 dB steps
Max. Peak Level: 3 dB above full scale reading
Upper Limit (RMS) for Crest Factor = 10: 17 dB below full scale
reading
Pulse Range: 83 dB
Linear operating ranges (broadband):
For the individual level ranges, at 1 kHz, the nominal upper
boundary level minus the lowest sound pressure level
measurable with a noise margin of 5 dB.
With a Microphone Type 4188 of nominal sensitivity:
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