Back to Measurement Microphones Sound Calibrators 
ZT-620 & ZT-621 Sound Calibrators
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Description
ZT sound calibrators are suitable for sound pressure calibration of microphones, sound level meters, and other electroacoustic testers. They are of high stability, small size, and light weight. ZT Sound calibrators use batteries as power. Its operating frequency is at 1000 Hz.\r\n\r\nZT sound calibrators conform to standards of IEC 60942-2003, ANSI S1.40-1984, and GB/T 15173.\r\n\r\nZT-620 is of sound level of 94dB.\r\n\r\nZT-621 is of sound level of both 94dB and 114dB.
Specifications
Sound Calibrators ZT-620 Sound CalibratorZT-621 Sound Calibrator
Sound Pressure Level 94dB±0.2dB94dB±0.2dB / 114dB±0.3dB
Accuracy Class 1
Standard IEC 60942-2003, ANSI S1.40-1984, & GB/T 15173
Frequency 1000Hz ±1%
Harmonic Distortion ≤2%
Power 9V 6F22
Operation Temperature 0℃ ~ 40℃
Operation Humidity ≤80%（40℃）
Size φ41×102 mm
Weight 250g
Applications
Microphone calibrationSound level meter calibrationField calibration