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Standard 2 Energy Band Light Curve
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FAQ |
Standard 2 Energy Band Light Curve Display
- Shows PCA counts/bin vs time in bins for four energy bands.
- The advantage of this display over other lightcurve displays is that
this one will display lightcurves in four different user-selectable energy ranges.
- The user can change the range limits of the four energy bands by clicking
on the "Adjust Energy Bands" button on the lower right corner of the display.
A spectrum display window will appear to allow the user to change the ranges.
NOTE: When the channel range is changed, the points already displayed are NOT rebinned! (They are not cleared, but they remain at the previous energy range.) Only the new data received is affected.
- An explanation of the timestamps.
Main Window:
Orientation:
- At the top is a bar of options controls.
- At the top center of the lightcurve is a status line showing important
options selected. If you save an ascii dump, these
options will be preserved in the output.
- Below the lightcurve the boxes show the count rate of the sum of all PCUs in each energy range.
- At the lower right corner, pressing the yellow box marked 'Adjust Energy Bands' will launch a pop-up window in which you can change the energy channel range to be displayed.
Spectrum / Adjust Energy Bands Window:
This window can be used to monitor the spectrum of the source as well as to
adjust the energy band ranges. See the help pages on the spectra displays for
information on the toolbar options.
Options buttons on the Main window:
File:
- Freeze [to stop scrolling of data, select again to resume.]
- Save or E-mail File [Allows you to email an ascii dump
or postscript plot to yourself.
- Quit [quits the window.]
Select: [to choose what data is displayed in the lightcurve.]
- Full Energy Band [default]
- Energy Band 1
- Energy Band 2
- Energy Band 3
- Energy Band 4
- All 5 plots
Yaxis:
- Linear - zero min
- Log - zero min
- Linear - own Scale [adjustable limits]
- Log - own Scale [adjustable limits]
Statistics [chooses what units to show at the bottom of the window.]
- counts/sec [shows counts/sec]
- Total Counts [calculates total area under the curve in number of total counts regardless of binsize.]
Options [selects which bin size to use for time scaling. This display always contains 512 bins, so the resulting total time span is also shown below.] See warning about loss of data below!
- X1 (16s bins) [default] [8192 sec (=~ 2 h 17 min) total span]
- X2 (32s bins) [16384 sec (=~ 4.5 hours) total span]
- X4 (64s bins) [32768 sec (=~ 9 hours) total span]
WARNING! Selecting a new binning does NOT re-bin the data previously shown in the window! The data in the window will be cleared and the new binning will take effect on the next data received.
Display
- with Gaps [show SAAs and data gaps as gaps in the lightcurve, preserving the correct temporal spacing]
- without Gaps [all data is shown contiguously, including occult and slew data]
- Late Data [pops up a window when data is late]
- Strip Chart [shows late data graphically]
- Clear LC [erases the data in the display]
XTE SOF - xtesof@xtesof.nascom.nasa.gov
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