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DAQ(The deviation between microphone and Noise Meter)

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

 

590F0915-A14A-4ADF-A086-4F3F887FAA67.jpeg

 

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

79DFD8DB-5322-4916-ACA6-3D88BF0DAC4D.jpeg

Werner_shih_0-1578384710808.png

 

the noise meter is 

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

 

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

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