PicoQuant GmbH HydraHarp 400 Software V. 3.0.0.1
Oscilloscope Mode:
The selection Oscilloscope from the selection box "Mode" selects the current acquisition mode
Oscilloscope for the HydraHarp. In oscilloscope mode the acquisition and display, once started, repeats at
intervals given by the current acquisition time setting. The histogram accumulation always starts from
scratch. This is useful for monitoring fast changes during optical alignment etc.
Integration Mode:
As opposed to oscilloscope mode, the histogram acquisition in integration mode is not reset to zero with
each display refresh. The histogram continues to grow while the display is updated every 0.1 to 1 seconds
determined by the refresh rate value selected in the General Settings Dialog. Acquisition can be manually
started and stopped, additionally the option "Stop on Overflow" will stop the acquisition when the maximum
count of any channel overflows. The option "Restart" will cause the acquisition to start again after the
acquisition time has elapsed. This is similar to oscilloscope mode but allows watching the histogram grow if
the acquisition time is fairly long.
TRES Mode:
Selects the measurement mode TRES (Time–Resolved Emission Spectra). This requires a mono-
chromator and corresponding driver hardware / software to be installed. See section 5.3.7.
Stop At edit box and spin control
Here the stop count level for histogramming can be set. The setting is only meaningful if the check box
"Stop Ofl" is active. Type the value as an integer in the edit box and press <Enter> or click on Apply.
Alternatively, use the spin control (next to it) to increment / decrement the current value. In this case changes
take effect immediately without pressing <Enter>. The minimum is 0. If the entered value exceeds the allowed
maximum of 4,294,967,295, an error message appears. When using the spin control exceeding the maximum
is simply not allowed. Instead of incrementing the value further, the system beeps a warning.
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