What is the difference between the RSA306 and the RSA306B? 

What is the difference between the RSA306 and the RSA306B? 

The primary differences between RSA306 and RSA306B are the RSA306B has the following improvements:

• Residual spurious improved by 10 dB overall and >40 dB at select frequencies
• Spurious with signal improved by 10 dB up to 3 GHz to -60 dBc
• Amplitude accuracy improved from 1.25 to 0.8 dB (95% confidence to 3 GHz)
• Improved warranty from 1 to 3 years