The HP 3577B measures network performance in the frequency range of 5 Hz to 200 MHz. Each of the receiver inputs provides 100 dB of dynamic range. A “line stretcher” is available with a readout in length or time. The line stretcher enables the electrical length of any channel to be changed as required. This allows compensation for differences in test cable lengths and measurement of the electrical length of networks under test. Each of the receiver inputs can be displayed on one or both traces. The traces are labeled Trace 1 and Trace 2. Trace data for each trace is digitally stored as complex data in a trace memory. This results in the ability to display the same data in any of eight display formats. The HP 3577B display has no etched lines. The graticule is drawn as a part of the display operation. No screen overlays are required for polar or Smith charts.