Level Meter
AdvancedThe Level Meter provides professional sound level measurement with data logging.
DocumentationFound in These Apps
Key Features
Lp, Leq, Lmax, Lmin display
A, C, Z frequency weighting
Fast, slow, impulse time weighting
Support for non-acoustic signals (SignalScope apps only)
Percentile exceeded levels (Pro)
Data logging up to 2 weeks (Pro)
Built for Standardized Measurement: The Level Meter offers standard sound level metrics, including time and frequency weighting, defined by ANSI S1.4 and IEC 61672 standards for sound level meters. The Level Meter also supports real-time root-mean-square (RMS) level calculations for non-acoustic signals, including dBV and dBu for audio signals.
Data Logging (Pro Feature): Log sound level data for up to 2 weeks at intervals as small as 0.1 seconds. Use the auto-save feature to keep logging data beyond 2 weeks, for as long as your device has disk space available.
Save Data: Export signal level values and metadata to a data file (.csv, .mat, or .txt). Or, generate a high-resolution image of the display and save it to a PDF file.
Live Web Preview (Pro Feature): Use SignalScope's built-in http web server to monitor signal levels remotely via a standard web browser. Your own custom software can remotely retrieve information from the Level Meter as JSON data to format, analyze, store, or display according to your specific needs.
Specifications
- Input: 1 channel at a time, selected from any available input, output, or virtual output channels
- Frequency Weighting: Z (zero, or no weighting), A, C
- A, C Weighting Supported Sample Rates (samples/second): 44100, 48000, 88200, 96000, 176400, 192000
- Sound Level Time Weighting: Fast, Slow, Impulse
- Non-acoustic Signal Level Type: Exponential, RMS
- Non-acoustic Signal Averaging Time (s): 1/8, 1, infinite (limited only by the measurement duration)
- Automatic Stop: Enable/Disable
- Automatic Stop Duration: 0.1 seconds up to 14 days, 23 hours, 59 minutes, 59.9 seconds
Sound Level Type:
- Time-exponential-weighted Sound Level (Lp)
- Equivalent Sound Level (Leq)
- Percentile-exceeded Sound Level (Lx) (Lx is a Pro Feature)
Data Logging (Pro Feature)
- Log Size: Uses Automatic Stop Duration
- Log Levels: Enable/Disable
- Reset Leq at Intervals: Enable/Disable
- Auto Save Log: Enable/Disable
- Log File Format: CSV, MAT, TXT
- Base File Name: User-defined
- Maximum Auto Saves: User-defined, if Auto Save Log is enabled, data logging will stop after this many log files have been saved
- Reset All After Auto Save: Enable/Disable
Log Interval
- User-defined, with constraints
- Data Log Size > 72 hours: Log interval >= 10 seconds
- Data Log Size > 8 hours: Log interval >= 1 seconds
- Data Log Size <= 8 hours: Log interval >= 0.1 seconds
Notification Events (Pro Feature)
- Local Notifications
- Auto-Stop
- Lp_max Exceeds: User-definable sound level threshold
- Leq Exceeds: User-definable sound level threshold
Scale
- Level divisions: 10
- Autoscale: Off, Auto, Up, Down
- Level Axis: Lin, dB
- dB Level Scale (dB/Div) 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 8.0, 9.0, 10.0, 12.0, 15.0, 16.0, 18.0, 20.0, 24.0, 25.0, 27.0, 30.0
- Lin Level Scale (Units/Div) 1e-9, 2e-9, 3e-9, 4e-9, 5e-9, 6e-9, 8e-9, 10e-9, 20e-9, 30e-9, 40e-9, 50e-9, 60e-9, 80e-9, 100e-9, 200e-9, 300e-9, 400e-9, 500e-9, 600e-9, 800e-9, 1e-6, 2e-6, 3e-6, 4e-6, 5e-6, 6e-6, 8e-6, 10e-6, 20e-6, 30e-6, 40e-6, 50e-6, 60e-6, 80e-6, 100e-6, 200e-6, 300e-6, 400e-6, 500e-6, 600e-6, 800e-6, 1e-3, 2e-3, 3e-3, 4e-3, 5e-3, 6e-3, 8e-3,10e-3, 20e-3, 30e-3, 40e-3, 50e-3, 60e-3, 80e-3,100e-3, 200e-3, 300e-3, 400e-3, 500e-3, 600e-3, 800e-3, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 80.0, 100.0, 200.0, 300.0, 400.0, 500.0, 600.0, 800.0, 1e3, 2e3, 3e3, 4e3, 5e3, 6e3, 8e3, 10e3, 20e3, 30e3, 40e3, 50e3, 60e3, 80e3, 100e3, 200e3, 300e3, 400e3, 500e3, 600e3, 800e3
Data Export
- Data File Format: CSV, MAT, TXT
- Image: PDF
- Optionally include current location in exported data files.