Many firearm examiners are tasked with determining whether installation of a suppressor on a firearm results in a “perceptible” reduction of the sound pressure level of a gun. The Larson Davis Spartan 821IH-QPR provides this functionality utilizing an easy-to use handheld platform. Included BLE technology allows for easy measurement control using the LD Atlas mobile app or included software. Meters may also be connected via USB-C.
With the included ¼” prepolarized pressure microphone, Spartan 821IH-QPR is capable of reading levels up to 183 dB, easily capturing levels typically associated with gunfire testing. Included G4 LD Utility software provides automatic wireless or USB data download, and convenient data storage options. View tabular data, visualize results on a graph, create custom reports, and export data to a variety of formats.
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| Features |
| Highlights |
Measure up to 183 dB |
| Class 1 Sound Level Meter |
| 48 kHz sampling rate |
| Simple setup for gunfire testing applications |
| Easy-to-navigate, responsive, touch display |
| Long battery life, up to 40 hours |
| Bluetooth BLE 4.1 wireless communication |
| Full control with LD Atlas mobile app |
| Dosimetry option included for noise exposure measurements |
| Applications |
Firearm noise testing |
| High SPL noise testing |
| Specifications |
| Dynamic Range (A-weighted typical) |
61 to 183 dB |
| Peak Dynamic Range (Z-weighted typical) |
103 to 186 dB |
| Time Weightings |
Fast, Slow, & Impulse |
| Frequency Weightings |
A, C, & Z |
| Data Storage (micro SD card) |
8 GB standard, up to 256 GB |
| Data Logging |
Time history: 1 s to 1 h, Measurement History: 1 min to 6 h |
| Metrics |
Leq, Lmax, Lmin, Lpeak, Ln (6 values), Time Above |
Firearm Noise Comparison Test
Model LXT1-QPR (now superseded by the 821IH-QPR) and Model 800B Sound Level Meters are used to measure firearm noise. A test was performed in reference to MIL-STD-1474E, which offers requirements for measuring impulsive noise, to evaluate the differences in measurement results. Read the complete report here.
