The 6 inch TFT monochrome LCD in the 2397 provides a clear,bright, sharp display with a 640 x 480 pixel active display area view-able in high ambient light conditions.The marker system allows up to a maximum of 9 markers to be dis-played on the screen at any one time. A marker table shows the fre-quency and level of each marker selected thus allowing multiple sig-nals to be evaluated simultaneously. In addition to the Normal mark-ers 2397 provides Delta, Peak Search, Peak Track, 1/Delta, MarkerTrack, Marker to Center, and Marker to Reference capabilities.The Limits facility allows an Upper and/or a Lower Limit to be seton the screen of the 2397. Should the signal being displayed fall out-side either limit a message will appear on the screen showing whichlimit has been exceeded and how many times this has happened.The 50 Ohm input on the 2397 can accept signals between +30 dBmand -110 dBm while providing protection up to 50 Vdc.