| Specifications |
Broadband measured
parameters |
Instantaneous level Lxy, maximum level Lxymx, minimum level Lxymn, peak level Lxpk, average level (Q=3) Lxeq, average level (Q=4) Lavg, average level (Q=5)
Lavg, takmaximal levels Ltm3 & Ltm5, exposure level LxE, |
| Acoustic accuracy |
ANSI S1.4 (R1997) type 1 and type 2, ANSI S1.43 1997, IEC 61672:2002,
IEC 60651 : 1994, IEC 60804 : 2000 |
| Microphone details |
CEL-251 ½" precision electret capsule for type 1 models,
CEL-253 ½" general purpose electret microphone for type 2 models
(preamplifier is fixed with industry standard ½" thread) |
| Broadband frequency weightings |
'A', 'C' and 'Z' (linear, un-weighted, all-pass level) simultaneously |
| Frequency response (Hz) |
6.3 Hz to 30 kHz for -3 dB down points |
| Time weightings (response) |
Slow and Fast for rms. |
| Peak frequency weighting |
'A', 'C' or 'Z' separate from rms. weighting |
| Dynamic range for display |
120 dB |
| Noise floor (dB) |
16.5 'A' weighted, 19.7 'C' weighted, 23.4 'Z' weighted |
| Maximum noise level (dB) |
140 dB rms., 143 dB peak |
| Resolution (dB) |
0.1 dB across whole measurement range |
| DSP sampling rate (Hz) |
67,200 Hz sampling with true rms. values calculated digitally |
| Memory storage capability |
100 complete runs each with the overall values of all parameters selected in
the setup (maximum of 9 per run plus start date & time) |
| Storage method |
Manually controlled by user via keypad Start and Stop keys |
| Duration for measurement |
Variable up to 24 hours maximum per run controlled by user |
| Calibration method |
Automatic detection of calibrator on microphone for both 1 kHz and 250 Hz
frequency operation. Meter set to user pre-entered calibrator dB level, date,
time and level of selected calibration is stored in meter |
| Configurations saved in memory |
3 factory defaults plus 2 user configured setups using optional dB30 software |
| Analog outputs |
AC signal 0.5 V rms. at 98 dB with 22 kΩ impedance
(plus optional log DC output 0 to 2 V for 0 to 140 dB at 14.28 mV/dB) |
| Digital output |
Download of stored data to pc or remote control of operations of meter via
dB30 software via RS232 port at 19200 baud maximum |
| Keypad control |
6 individual keys with auto backlight operation on key press |
| Screen languages for display |
English, French, German, Italian, Spanish menu selectable |
| LCD screen display |
128 x 64 pixel monochrome backlit display with icon indicators can show up
to 9 parameters simultaneously on screen using Up/Down scroll keys |
| Size |
13.4 x 4 x 1.5 in (340 x 100 x 40 mm) |
| Weight |
19.3 oz (550 gm) plus batteries |
| Tripod socket |
Standard camera thread (1/4 inch) |
| Internal power supply |
4 off AA alkaline cells (15 hours typical maximum battery life) |
| External power supply |
12 V dc at 150 mA nominal via 2.1 mm power connector |
