PicoQuant GmbH HydraHarp 400 Software V. 3.0.0.1
6.3. Toolbar
Toolbar buttons of special interest are explained in some more detail here:
Context Help
When you choose the Context Help button, the mouse pointer will change to an arrow and question mark. Then
click somewhere in the HydraHarp window, such as on another toolbar button. The help topic will be shown for
the item you clicked.
Axis Panel
Clicking this button opens the Axis Panel. This panel provides controls for the axis limits and lin / log display
switching. Double–clicking the axes opens the same dialog. The dialog is non–modal, so it can remain
permanently open. The panel will remember its last position when closed. When it is opened the next time it will
be at that screen position again.
Data Cursor
Opens the data cursor dialog box. You can use this dialog to mark and retrieve the data values of individual
histogram channels. A pair of cross hairs will be provided for marking data points with the mouse or keyboard.
When the data cursor dialog is activated, the cross hairs will appear in the histogram display area. By clicking
on or near a data point, the current cross hair (black) will snap to that point. At the same time a second cross
hair (grey) will jump to the previously marked point. The data cursor dialog then shows the current count and
time values for these points as well as the corresponding differences (deltas). The data cursor always applies
to one "active" curve only. You can select this active curve at the top of the dialog where it is shown with its
corresponding curve colour. While normally the grey cross hair jumps to the previous data point, you can
modify this behaviour by holding the SHIFT key down while clicking on curve points. The grey cross hair will
then remain at its previous position. This allows finding a particular point while keeping the other one fixed.
Another advanced mode of operation of the data cursor is possible via the LEFT and RIGHT arrows of the
keyboard. Pressing these keys will direct the black cursor to the next left or right point in the curve. Again, the
behaviour of the marker for the previous point (grey cross) can be controlled via the SHIFT key.
Calibrate
Calibrates the time measurement circuits. This is necessary whenever temperature changes > 5 K occurred.
Calibrate after warming up of the instrument before starting serious measurements. Warming up takes about
20 to 30 minutes dependent on the lab temperature. It is completed when the cooling fan starts to run for the
first time. Calibration takes only a few seconds. During calibration the status bar shows the message
CALIBRATING. Calibration is only important for serious measurements. You can use the instrument during the
warming–up period for set–up and preliminary measurements. For very long measurements, allow some more
time for thermal stabilization, calibrate immediately before the measurement commences and try to maintain a
stable room temperature during the measurement. The permissible ambient temperature is 15°C to 35 °C. Do
not obstruct the cooling fan at the back and the air inlets at the bottom of the housing.
Control Panel
Launches the HydraHarp Control Panel. If the control panel is already open, subsequent clicking of this button
will just make the control panel the active window. The dialog is non–modal, so it can remain permanently
open. The panel will remember its last position when closed. When it is opened the next time it will be at that
screen position again, even in the next HydraHarp session.
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