Input range of NI PCI

[tronoh]

Dear Sir

I read in user mannual of NI PCI 6281 that it has minimum input range -100 mv to 100 mv. So if i select this range then reslution will be 0.2/262144 = -122 dB. Now if i have to measure signal of -160 dB then how I can measure it?

I read somewhere that NI PCI has adjustable gain fromm 1 to 10000 and by adjusting that gain, I could measure -160 dB signal. Can you please guide me from where I can adjsut the gain? I check in DAQ Assistant but could not find.

Thank You.

Regards

Tronoh

[Dennis_Knutson · Accepted solution]

The gain is automatically set when you specify the minimum and maximum. The range of your specific card is what is in the specifications. A different device could have a lower minimum range but to suggest that PCI in general has a lower range is just silly. Whatever you read 'somewhere' would have to refer to a different card. If you need better resolution, you need a different device.