The R3131 Series is a spectrum analyzer that provides the user with highly stable spectrum analysis using the synthesized local method. The key features o f the R3131 Series spectrum analyzer are listed below. (1) Frequency Range: 9kHz to 3GHz, Frequency span: Zero, 50kHz to 3GHz. Frequency span settable range: Zero, 10kHz to 3 GHz (R3131A only) (2) Frequency counter function with a resolution of 1Hz. (3) A power measurement function useful for evaluating radio instruments using measurements such as occupied bandwidth (OBW), adjacent channel power (ACP), channel power, etc. (4) An auto tuning function that searches for a signal with the maximum input level. (5) Save and recall functions which you can use to store measurement conditions and data in TEXT format. (6) A 3.5-inch floppy disk drive which you can use to save screen images in BMP format. (7) Support for ESC/P, ESC/P-R and PCL compatible printers. (8) Remote control capabilities which allow you to setup an automatic measurement system. This remote control function complies with GPIB and RS-232 specifications.