CAL250 Precision Acoustic Calibrator IEC 60942 Class 1 Handheld Sound Level Calibrator for 1” microphones at 251.2 Hz Used for Sound Level Meters and Other Sound Measuring Equipment Highlights I Internal battery Output level independent of battery condition Adaptors: 1/2”, 1/4”, 3/8”, 1/8” microphones Array adaptor for 8 microphones simultaneously Applications Field calibration or laboratory calibration of: I Sound level meters Noise dosimeters Noise monitoring stations Microphone arrays CAL250 Portable Sound Calibrator The Larson Davis Model CAL250 is a battery operated precision microphone calibrator used for the calibration of sound level meters and other sound measurement equipment. The CAL250 delivers a full 114.0 dB level output signal @ 251.2 Hz. It has been designed for field or laboratory use and its accuracy has been calibrated to a reference traceable to the National Institute of Standards and Technology (NIST). ADP021 ADP019 The Larson Davis CAL250 features a stable sound pressure independent of the battery condition. In addition, the CAL250 will turn off automatically to preserve battery and guarantee a stable output. Larson Davis

CAL250 Precision Acoustic Calibratorµ Acoustic Calibration sound pressure level Equivalent free-field level Harmonic distortion Stability after pressing On Minimum stabilizing time 10 seconds after coupling microphone and calibrator Reference conditions Static pressure range Temperature range SPL variation < ± 0.3 dB SPL variation < ± 0.4 dB Frequency variation < ± 2 Hz SPL variation < ± 0.4 dB Frequency variation < ± 2 Hz Storage temperature Storage humidity Effective volume of calibrator and microphone Battery Voltage Operating Range 6.7 V to 10 V Traceable to National Institute of Standards...