Changes
SHOC
,/* LED timing tests */
===LED timing tests===
''This functionality should be available on the 74", the 40" and the new 1m. It has only been tested on the 74".''
The idea is to take a long, GPS-triggered data cube with SHOC at high cadence, while running the LED for a few minutes of at 1 PPS (which has a longer pulse on the minute and can thus be used to test absolute timing accuracy), then switching the LED to approximately a minute or so for at least 2 other settings e.g. 5Hz, 2 Hz (which can be aligned with the observed flashes to test relative timing accuracy).
*There is an LED mounted in the telescope optical path that can be used to independently verify SHOC timing. Log into the following website:
* '''To take a timing data cube:'''
** start the LED at 1 PPS
** in preview mode, increase the SHOC binning and readout speed to reach the desired exposure cadence (< 0.05s).
** set SHOC to external timing, select >=10000 frames, and start the GPS with repeated pulses at the chosen cadence
** REMEMBER TO TURN OFF THE LED PULSES WHEN DONE.
* '''Analysis:''' you are free to analyze your own timing data! Otherwise, an analysis pipeline has been written by Marissa Kotze and is supported by Carel van Gend. Carel can assist with data analysis.
* Download the SHOCpipeline.tar and PULSEtiming.tar software. Create a directory for the software (e.g. timingtests) and extract the software to that directory:
mkdir timingtests
cd timingtests
tar -xvf ../SHOCpipeline.tar
tar -xvf ../PULSEtimin.tar
* Read and follow the README file for notes on setting up iraf.
* Then make a further subdirectory for the testdata:
mkdir testdata
* Copy the data cube to this directory, and run the testPULSEtiming.py script:
python testPULSEtiming.py <SHOC fits file name>
* The software will examine the header, ask the user for confirmation of a few values, and then verify the timing. A report is printed out at the end.
== In-depth Information ==
