Easily measure very quiet sounds using the SoundAdvisor™ Sound Level Meter Model 831C paired with the Model 378A04 Low Noise Microphone and Preamplifier. Due to the innovative design of the 378A04, which uses a prepolarized microphone and ICP® (constant current) interface, the combination produces a highly portable system that is battery-powered and intuitive to use.
The Model 831C-LOWN configuration is ideal for measurements where noise levels are extremely low, such as very quiet soundscapes and quiet machines.
Because the 831C-LOWN consists of the popular SoundAdvisor Model 831C paired with the 378A04 low-noise microphone, it can be used with the wide range of 831C accessories. For example, use with the DVX012 Ethernet dongle to provide network connectivity or the SoundAdvisor Portable Noise Monitoring System Model NMS044 to create a low-noise portable monitoring solution.
| 831C-LOWN SPECIFICATIONS | |
|---|---|
| Calibration | Requires 94 dB re 20 µPa calibrator such as CAL200 |
| Self-generated Noise (typical) | |
| Weighting | 0 dB Gain |
| A | 5.5 dB |
| C | 10 dB |
| Z | 18 dB |
| Alkaline Battery Life | Decreased approx 15% when using 378A04 |
| 831C-LOWN Included Items | |
| 831C | Model 831C Sound Level Meter |
| 831C-ACC | Accessory kit for Model 831C |
| ADP074 | Adapter for ICP input (BNC) |
| 012A10 | BNC cable, 10 ft (3 m) |
| BNC M-M | BNC male to male connector |
| ADP032 | Adapter to mount ½ inch preamplifier to tripod (1/4-20 thread) |
| Ordering Information | |
| 831C-LOWN | Low noise system including Model 831C, 378A04 low noise microphone r preamplifier and accessories |
| Optional Accessories | |
| CAL200 | Class 1 acoustic calibrator, 94 or 114 dB at 1 kHz (378A04 must be calibrated at 94dB) |
| PRM831-FF | PRM831 preamplifier with free field microphone (377B02) |
| PRM831-RI | PRM831 preamplifier with random incidence microphone (377B20) |
| TRP001 | Tripod with ADP032 for mounting ½ inch preamplifier |
| Software | |
| SWW-DNA | Software and USB dongle for evaluation and reporting |
| SWW-DNA-831 | Instrument driver for SWW-DNA to provide control, live display, and data translation from Model 831 |
| 378A04 SPECIFICATIONS | ||
|---|---|---|
| Acoustic | ||
| Sensitivity | 450 mV/Pa -7 (±2 dB) re 1 V/Pa | |
| Frequency Range | 10 to 16,000 Hz | |
| Inherent Noise | < 6.5 (5.5 typical) dB re 20 µPa | |
| 3% Distortion Limit | Level (dB re 20 μPa) | Frequency |
| 100 dB | < 5 kHz | |
| 80 dB | > 5 kHz | |
| Environmental | ||
| Operating Temperature | 14 °F to 176 °F (- 10 °C to 80 °C) | |
| Operating Humidity | 0 to 99% relative humidity, non-condensing | |
| Electrical | ||
| Polarization | 0 V | |
| Output Voltage | ± 2 V peak maximum | |
| ICP constant current | 4 to 20 mA (4 mA supplied by Model 831C) | |
| Physical | ||
| Diameter with Grid | 0.52 in (13.2 mm) | |
| Height with Grid | 4.02 in (102.1 mm) | |
| Equalization Vent | Rear | |
| Weight | 1.8 oz (51.3 grams) | |
| Maximum Sound Pressure | 130 dB re 20 μPa peak | |
| Mechanical | Grid cap and microphone not removable | |