Sound Calibrator 2 Point ( HTC – CAL-900 )

Description

The HTC CAL‑900 Sound Level Calibrator is a precision-grade instrument designed to calibrate sound level meters and measurement microphones with outstanding accuracy and reliability. Engineered for professionals in environmental acoustics, industrial noise control, and audio equipment maintenance, this calibrator ensures accurate readings in both laboratory and field environments. Its dual-level output and stable performance make it essential for consistent microphone calibration.

At the heart of the CAL‑900 is its ability to generate two standardized sound pressure levels: 94 dB and 114 dB at a precise frequency of 1000 Hz ±0.01%, supporting A, B, C, D, or linear weighting networks. With an accuracy of ±0.3 dB, it delivers highly reliable output essential for microphone sensitivity checks and sound meter calibration—aligned with international calibration standards GB/T15173 and IEC 942.

Designed for practical use, the CAL‑900 features a compact and lightweight build—measuring approximately 137 × 51 × 51 mm and weighing just 200 g—making it easily portable for onsite testing or lab use. Powered by four AAA (1.5V) batteries, its power-efficient design ensures long operational life without requiring special power supplies.

The device operates reliably across diverse environments, with a stable operating temperature range from –10 °C to +50 °C, and immune to humidity and pressure changes. When stored without batteries, it withstands temperatures from –40 °C to +65 °C. Its temperature coefficient is impressively low—0 to 0.01 dB/°C—ensuring minimal output drift during use. Altitude effects are accounted for, with a noted decrease of approximately 0.1 dB per 2,000 ft of elevation due to thinner air density, allowing users to adjust calibrations accordingly.

The CAL‑900’s user interface is straightforward yet effective: simply insert either a ½″ or 1″ microphone into the coupler, select either the 94 dB or 114 dB output via clearly labeled buttons, and calibrate instantly. A snug fit around the microphone ensures an airtight seal, preventing sound leakage and guaranteeing accurate calibration measurements every time.

Durability is a key attribute: built with solid-state circuitry and reinforced housing, the calibrator supports years of consistent service when maintained properly. It also includes built-in overload protection and clear over-range display cues, helping safeguard both the instrument and the user during rigorous testing scenarios.

Each unit includes essential accessories for immediate use—a carrying case, operation manual, and batteries—ensuring hassle-free deployment in both training and operational settings. With its rugged performance, the CAL‑900 is ideal for acoustic labs, environmental monitoring agencies, industrial sound auditing firms, and audio equipment professionals.

Key product highlights include:

• Dual sound pressure output: 94 dB and 114 dB at 1000 Hz ±0.01%

• High accuracy of ±0.3 dB, suitable for Class-1 calibrations

• Compatibility with ½″ and 1″ microphones

• Temperature stability across –10 °C to +50 °C operating range

• Lightweight, portable design (200 g) powered by 4×AAA batteries

• Conformance with GB/T15173 and IEC 942 standards

• Minimal drift with temperature coefficient ≤ 0.01 dB/°C

• Altitude compensation: approximately 0.1 dB change per 2,000 ft

• Rugged construction for reliable long-term field and lab use

In short, the HTC CAL‑900 Sound Level Calibrator is a high-performance, precision instrument that simplifies and enhances the calibration of microphones and sound level meters. Combining accuracy, portability, durability, and international standard compliance in one compact tool, it enables professionals to achieve reliable acoustic measurements—every time.