DAQ(The deviation between microphone and Noise Meter)

[Werner_shih]

Dear Everyone:

I am struggling for a tough problem as following:

I don't know why there is some deviation between noise meter and microphone approximately 10 dB

 

the equipment:

1. cDAQ-9171

2. PCB Piezotronics 130F21(Sensitivity=45 mV\pa)

https://www.pcb.com/products?m=130F21

the following is my code

 

the noise meter is 

TES 1350A http://www.tes.com.tw/en/product_detail.asp?seq=390

[MRicefield]

Are the devices calibrated? If so, the calculation of sound level in two devices is same??