Acquiring Point-Wise Data

This mode involves moving the antenna to a specified position, waiting a few seconds, sampling the inclinometer system channels for a further few seconds, and moving to the next position. The elevation is held constant throughout, and the INCLINE task reads the sequence of azimuths from a specified file. The sample_rate in this mode is the maximum available, 3.5Hz, at the default baud-rate of 9600.

Anticipating that more highly resolved data may be necessary around the track joints, a program called AZGEN was written that can produce a sequence of azimuths at varying resolution. It is used by issuing the command

@ [JCMTUSER.INCLINOMETRY.PROGS]AZGEN

The output file of azimuths must be suitably de-protected and placed in the data-acquisition sub-directory, conventionally DISKUSER:[JCMTUSER.OBSERVE.INC].
(The observing system must be run up in plane 129 or higher.)

The following commands will set the Inclinometry system to take readings at the azimuths specified in the azimuth file,

        ICL> INCLINE_LOAD
        ICL> SEND INCLINE SET AZ_FILE (azimuth_filename)
        ICL> INCLINE_COLLECT (filename) (settle_time) (sample_time)

These commands will set the Telescope to move to each azimuth in the azimuth file and wait for settle_time in seconds before continuously taking samples for sample_time seconds. In this mode the task will write two output files filename.DAT and filename.DEV. The .DAT file contains the mean values for each inclinometer channel (X tilt, Y tilt and Temperature, in mV) for the azimuth position specified in the azimuth file. The .DEV file contains the standard deviations of the samples whose means are recorded in the .DAT file.