XT2640 Operating Manual
13 July 2016
Page 59 of 187
Or, press anywhere on the chart, this places a cursor at the horizontal position pressed. You may drag the cursor in this
manner and if dragged off the left or right edges of the chart then it will also scroll the displayed timespan, or you may
simply reposition the cursor by pressing somewhere else on the chart.
The screen below shows an example of a HISTORY data screen with the cursor shown and zoomed in.
When the cursor is shown –
The CURSOR button is highlighted colored green
The time position of the cursor is shown above the cursor line
The cursor remains at the same position in time relative to the start of the data collection.
The textual data in the left side of the screen changes to show the maximum, average and minimum data recorded for each
trace in the time increment corresponding to the width of one pixel at the present cursor position.
You may zoom the chart horizontally by pressing the ZOOM+ button (next to the CURSOR button). While zoomed –
You may zoom in further by pressing the ZOOM+ again, or may zoom back by pressing the ZOOM‐ button.
The cursor remains set to the same time as it was prior to zooming, but it may still be moved within the timespan
of the zoomed chart by pressing at the desired location within the chart.
The cursor may be moved beyond the left and right ends of the timespan being viewed by dragging it beyond
those edges, in that case the cursor remains at the edge and the chart timespan being shown is changed. This
enables you to ‘drag’ the timespan being viewed without having to zoom back out.
Each ZOOM+ press changes the horizontal timing by a nominal factor of 2:1 and a maximum of 10 zoom levels are
allowed (i.e. the maximum zoom is 1000:1).
When the chart is zoomed by the maximum factor the span of the zoom changes to reflect that it is constrained to
be a minimum of 1/1000
th
of the overall history timespan however the cursor position remains the same.
Any zoom can be cancelled and the screen returned to the non‐zoomed state without a cursor at any time by pressing the
CURSOR button while it is highlighted.
12.9.6
RESCALING
THE
CHART
TRACES
You can press the AUTOSCALE button to rescale all traces to the most optimum 1/2/5 scales (per division) to maintain all traces just
within the vertical extents of the chart. This action changes the scaling for each enabled trace entered in the TRACES configuration
but does not alter the offset settings.
12.9.7
EXPORTING
OR
RECORDING
HISTORY
The method for performing this is fully described in section 23.
Historically saved measurements can be exported to a .CSV format textual file on an external USB drive attached to the front panel
USB port. This file contains all captured measurements as configured for the traces on the HISTORY screen (without regard to the
scaling or offset configuration). The tabulated data covers 8192 equally spaced time increments from the start of the history capture
to the end of it and contains the maximum, average and minimum of all measurements during each time increment.
Briefly, this is performed by –
7.
Insert the drive into the front panel USB port and wait for it to be READY.
8.
Press the DRIVE INFO area of the screen, the screen shows the file export/import screen.
9.
Press the HISTORY button. The screen changes to allowing you to enter a file name.
10.
Enter the desired file name (the extension is automatically provided).
11.
If the file already exists then you are prompted to respond if you wish to overwrite it or not.
12.
The file is then written.
Alternatively, you can make a record of the HISTORY screen by saving an image of it to a graphic file on an external USB drive
attached to the front panel USB port.
Briefly, this is performed by –
1.
Insert the drive into the front panel USB port and wait for it to be READY.
