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Precision Integrating Sound Level Meter and Analyzer
The Genrad 1988 measures and displays sound-pressure level (SPL or LEQ) or sound-exposure level (SEL) integrated over selectable times ranging from 1 s to 24 h. Integration can be timed manually or automatically. Two time ranges are available: 1 s to 600 s in 1-s steps and 10 min to 24 h in 1 -min steps.
Features
- Digital and analog displays
- Digital display captures and holds maximum sound level for accurate readings
- 50-dB analog meter scale has 1-dB linear calibration
- Meets the following standards (use 1987 or 1986 Sound-Level Calibrator):
- ANSI Standard Specifications for Sound-Level Meters S1.4-1971, Type 1 (Precision)
- IEC Standard 651-1979, Sound-Level Meters (Type 1)
- ANSI Standard Specification for Octave, Half-Octave, and Third-Octave Band Filters for the Analysis of Sound and Vibration
Specifications
| Measurement Range |
| Sound Level Range: |
30 to 140 dB in four 50-dB switch-selectable ranges |
| Frequency Response: |
A, B, and C weighting; 10 octave-band filters ranging from 31.5 Hz to 16 kHz; FLAT response 5 Hz to 20 kHz |
| Detector Response: |
Fast, slow, impulse (per IEC651) and absolute peak, switch selected |
| Displays |
| Analog: |
Meter 3-in. scale, 30 to 80, 50 to 100, 70 to 120 and 90 to 140 dB |
| Digital Readout: |
4-digit with decimal point |
| Outputs |
| AC Output: |
Weighted, 400 mV rms nominal full scale |
| DC Output: |
3 V nominal full scale |
Note: Includes GenRad 1962-10240 Random Incidence Electric microphone
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