Span, Position And Trace Functions To Adjust The Waveform Display - GRAPHTEC GL840 Quick Start Manual

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Span, Position and Trace Functions to Adjust the Waveform Display

1. Starting data capture
Trigger functions can be used to control the timing of the start of a data
capture operation, and the timing of the end of a data capture operation.
Points to Remember
The span, position and trace operations can be performed while the GL840 is in
the Free Running status, while it is capturing data, and while it is replaying data.
The changes are applied to the displayed data only, the change is not affected
to the captured data.
1. How to Make a Span setting
The Span parameter is used to adjust the amplitude of the input waveform.
This setting is made in the aforementioned Free Running status.
(1) Set the displayed span for CH 1 to 100ºC.
(2) Press the [SPAN/TRACE/POSITION] key to select the SPAN mode.
(3) Use the and keys to make CH 1 active (enlarged display).
(4) Use the and keys to change the Span value. Here the value for
span is set to 110ºC.
When this setting has been changed, the waveform screen scale will be
set to "+110.0 to +0.0".
2. How to make a Position setting
The Position parameter is used to adjust the position of displayed waveform
that is set by the upper and lower values.
(1) Press the [SPAN/TRACE/POSITION] key to select the POSITION mode.
(2) Use the and keys to make CH 1 active (enlarged display).
(3) Use the and keys to set the Position value to "+90ºC to -20ºC".
When this setting has been changed, the waveform screen scale will be
set to "+90ºC to -20ºC".
3. How to make a Trace setting.
The Trace parameter can be used to specify the selected waveform to be
visible or invisible on the display.
(1) Press the [SPAN/TRACE/POSITION] key to select the TRACE mode.
(2) Use the and keys to make CH 1 active (enlarged display).
(3) Use the and keys to select Off.
When this setting has been changed, the CH 1 waveform is not
displayed.
Points to Remember
The currently selected mode (SPAN,
POSITION or TRACE) can be checked by
looking at the "Waveform Operation Display
Area".