BRUEL & KJAER 4220 - Specifications

Specification
Aeenracy: ± o.2 dB.'
Sound Pressure Level: 124 dB re. 2 X 10-4 pbar (individually calibrated).
Frequency: Pos. "Measure": 250 Hz ± 1 %.
Pos. "Check": 350 to 40() Hz (with new batteries).
Distortion: Less than 3 % at 250 Hz.
Batteries: 7 Mallory RM-3(R) mercury cells supplied. (B & K part No. QB 0002)
Diameter 25.1 mm (0.98"). The ~attery compartment will also accept
RM-4(R) cells (diameter 30.2 mm, 1.19"), giving 50% longer service
life.
Temperature Range: Batteries: 0°-60°C (32°-140°F).
Pistonphone alone: -40° to 60°C (- 40° to + 140°F).
Humidity: Relative humidilies of up to 100 % will not influence the calibra
tion.
Dimensions: Length: 230 mm (9''). Diameter: 36 mm (1.4").
Weight: Pistonphone witb bafteries: o.7 k~ (1.5 lbs.).
22
Total weight of the case containing pistonphone, adaptors, and baro -
meter 1.6 k~ 13 n lbs.\.'