8163A/B, 8164A/B, 8166A/B User’s Guide 251Applications 10How to Zoom OutTo zoom out one level around the active marker:1 Press the [Next] softkey until you move to your chosen marker.2 Position the marker using the cursor key.3 Press the [ZoomOut] softkey to zoom out one level from the activemarker. In this way, you can zoom out from the active marker and thezoom function is separate for the x and y axes.To zoom out to the fullest extent:4 Press the [Menu] softkey. The menu appears.5 Move to <Zoom to Overview>.To Switch the Grid On/OffAs a default, the graph is displayed with gridlines.To switch this grid off:1 Press the [Menu] softkey. The menu appears.2 Move to <Grid Off>.If the grid has been switched off, to switch the grid on:1 Press the [Menu] softkey. The menu appears.2 Move to <Grid On>.How to Use LegendsLegends are used to identify Power Meter channels on the graph in thefollowing ways:• Legend numbers that are displayed on the graph.• Legend texts can be accessed by pressing the [Menu] softkey andmoving to <Legend>.How to Identify CurvesLegend numbers can be related to the curves they represent in thefollowing ways:• For the 8163A/B Lightwave Multimeter the legend number is displayedat the same height as the first sample of the power measurementchannel on the right-hand side of the screen.• For the 8164A/B Lightwave Measurement System, the legend numbersare directly beneath the graph. Each number is the same colour as thecurve it represents.
