BB106411.book : 2237-ch6 Black 2
Chapter 6 – Specifications
6–2
Brüel & Kjær2237 Controller
User Manual
6.1 Specifications
Standards:
Conforms with: IEC651 (1979) and 804 (1985)
Type 2; ANSI S1.4 – 1983 and Draft S1.43, 6th
September, 1992 Type 2; BS 5969 and BS6698
Type 2
Measuring Ranges:
Noise Floor:
Below measurement range; less than 30dB.
Frequency Weighting:
RMS:
A: According to Type 2 tolerances
Peak:
C: According to Type 2 tolerances
Linear: 31.5Hz – 8 kHz (–3 dB)
Detectors:
Simultaneous RMS and Peak with independent
frequency weightings
Linearity Range: 70dB
Pulse Range: 73dB
Non-linear Distortion: Too small to affect accu-
racy
Peak Detector Rise Time: Typically 50µs
Time Weighting:
S, F, I according to Type 2 tolerances. See
Fig.6.2 .
Range
(dB)
Max.
Peak
level
Upper limit (RMS) for
signals with crest
factor = 5 (14dB)
30 – 100 103 89
50 – 120 123 109
70 – 140 143 129
Display:
4 line LCD showing:
• Input signal level – indicated with a quasi-ana-
logue bar (updated 15 times per second)
• Selected parameters with level
• Warnings for: battery low and overload
• Measuring range
• Time weighting setting
• Elapsed measurement time
• Menus for displaying and editing settings
• Recalled records
Features a back-light for easy viewing, which can
be turned on and off and includes an auto time-
out to save batteries.
Displayed parameters updated once per second.
Exchange Rate:
3dB
Parameters:
Types:
L
eq
(L
Im
), MaxP, Peak, MaxL, MinL, SPL, Inst
Resolution: 0.1dB
Memory:
40 Records of measurement results
Microphone:
Type 4137 Prepolarized Free-field 1/2″ Condenser
Microphone
Sensitivity: –30dB re 1V/Pa ±2dB
Frequency Range: 8Hz to 10 kHz ±2dB
Capacitance: 12pF
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