25. Multifunction Sound Calibrator, class 1 - 42AG

It can produce a sinusoidal signal of 250 Hz or 1 kHz at 94 dB or 114 dB. For documentation purposes, 42AG provides display of the environmental conditions: ambient air pressure, temperature.

42AG可以在94 dB或114 dB 产生250 Hz 或1 kHz的弦波信号。 出于纪录目的，42AG亦可提供当时校准环境情况, 包括环境空气压力、温度。

G.R.A.S.

The sound is generated by a small loudspeaker integrated in the acoustic coupler. An internal reference microphone measures the level in the coupler and a feed back circuit automatically adjusts the level. Therefore, the calibration level is virtually independent of ambient conditions like temperature, atmospheric pressure and humidity within the specified range of operation.

声音由集成在声耦合器中的小型扬声器产生。 内部参考麦克风测量耦合器中的电平和反馈电路自动调节电平。 因此，校准水平实际上与指定操作范围内的温度、大气压和湿度等环境条件无关。

G.R.A.S.

The calibrator has been designed to serve 1” and smaller microphones and sound level meters equipped with such microphones. 1” microphones fit directly in the calibrator coupler, while 1/2”, 1/4” and 1/8” microphones are served by application of adapters that are part of the delivery.

校准器设计用于配备1寸和更小的麦克风以及配备此类麦克风的声级计。 1寸麦克风直接安装在校准器耦合器中，而1/2寸，1/4寸和1/8寸麦克风可配合GRAS提供的不同适配器来应用。

G.R.A.S.

The calibrator is powered from two type LR03 alkaline batteries (AAA-size). lf the voltage supplied by the batteries is too low to ensure proper operation, the calibrator will automatically switch off or not switch on.

校准器由两节LR03碱性电池（AAA尺寸）供电。 如果电池供电电压过低而无法确保正常运行，校准器将自动关闭或不作开启。

G.R.A.s.

Benefits

42AG is designed to fulfil the need for a portable and versatile calibrator for field use. Also, it is designed to be the logical replacement or upgrade from existing calibrators.

42AG旨在满足使用者能在不同测试场地使用便携式多功能校准器的需求。此外，它也成为现有校准器的合理替代或升级版校准器。

GRaS

42AG represents improved functionality and user friendliness. Its combination of portability, automatic level adjustment and two calibration frequencies and levels makes it a complete and self sufficient solution that can be used to perform a complete field-verification without the need for other instrumentation, e.g. for recording ambient calibration conditions.

42AG代表了改进的功能和用户友好性。其便携性、自动电平调节、两个校准频率和电平的组合使其成为一个完整且自给自足的解决方案。42AG可用于执行完整的现场验证，而无需其他仪器。例如，用于记录环境校准条件。

GRAs

With two calibration frequencies, 250 Hz and 1 kHz it is well suited for calibration of microphones that normally are calibrated at 250 Hz  as well as sound level meters which normally are calbrated at 1 kHz.

42AG具有两个校准频率，包括 250 Hz和1 kHz，非常适合校准通常以250 Hz校准的麦克风以及通常在1 kHz下校准的声级计。

G.R.A.S.

42AG can calibrate at two different levels, 94dB and 114 dB. The 114  dB is a level that suits microphones with medium sensitivity, while the low level of 94 dB makes it possible to calibrate microphones with high sensitivity without overloading the microphone.

42AG可以在两个不同的电平下校准- 94dB和114dB。 114 dB是适合中等灵敏度麦克风的电平，而94 dB的低电平使得可以高灵敏度地校准麦克风而不会使麦克风过载。

G.R.A.S.

Sepcification 

Sound pressure level   声压级: 94 dB or 114 dB
Frequency: 250 Hz or 1 kHz
ANSI: S1.40
IEC: 60942 class 1

G.R.A.S.

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