Measurement
30 - 130 dB.
Range
Resolution
0.1 dB.
Accuracy
* Meet IEC 61672 class 2, tested under
( 23± 5 )
℃
Input signal level on 94 dB &
frequency range from 31.5 Hz to
8 k Hz, refer to page 11.
Range selector
Auto range :
30 to 130 dB.
Manual range :
3 range, 30 to 80 dB, 50 to 100 dB,
80 to 130 dB, 50 dB on each step,
with over & under range indicating.
Frequency
31.5 to 8,000 Hz.
Microphone type
Electric condenser microphone.
Microphone size
Out size, 12.7 mm DIA. ( 0.5 inch).
Weighting Network Characteristics of A & C.
Range selector
Manual range: 3 ranges ( 30 to 80 dB,
50 to 100 dB, 80 to 130 dB ).
Auto range: 30 - 130 dB.
Time weighting
Fast - t= 200 ms, Slow - t = 500 ms,
( Fast & Slow )
* "Fast" range is simulated the
human ear response time.
* "Slow" range is easy to get the avg.
values of vibration sound level.
* The "Fast" & "Slow" response
range are designed to meet IEC 61672
class 2 requirement.
Calibrator
B & K (Bruel & kjaer), MULTIFUCTION
ACOUSTIC CALIBRATOR 4226.
Output Signal
* AC output :
AC 0.5 Vrms corresponding to each
range step.
Out put impedance - 600 ohm.
* RS232 output.
2
