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Larson Davis Acoustic Calibrator Model CAL1250 is a battery-operated precision microphone calibrator used for the calibration of sound level meters and other sound measurement equipment with 1” and smaller microphones. CAL1250 provides an output level of either 94 dB or 114 dB at 251.2 Hz or 1000 Hz. The four combinations of frequency and level make the CAL1250 a great choice for extended field validation of instruments.
The CAL1250 includes a rugged carrying case but fits in any case designed to include the CAL1150 or CAL1200. Adapters for 1/2” and 1/4” microphones are included with optional adapters for 3/8” and 1/8” microphones available.
Field or laboratory calibration of:
| Frequency | 251.2 Hz ± 1 Hz or 1000 Hz ± 1 Hz |
Calibration Sound Pressure Level | 94.0 dB or 114.0 dB ± 0.2 dB |
| Minimum Stabilizing Time | 10 s after coupling microphone and calibrator |
| Dimensions (L x W x H) | 3.85 x 2.43 x 1.57 in (98 x 62 x 40 mm) |
| Weight | 5.5 oz (156 g) |
| Charging Connector | USB-C |
| Safety | IEC 61010-1:2017 |
| Acoustic | ANSI S1.40-2006, Class 1 IEC 60942:2017, Class 1 |
| EMC | Directive 2014/30/EU |
| CE | Yes |
| ROHS | Directive (EU) 2023/1437 |