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DA
Date Set
The Brewer ephemeris requires GMT (both date and time) for proper operation. Under
normal, uninterrupted operation, the computer, and Brewer, dates will change at 00:00:00
UT, and are displayed on the monitor screen. Under some conditions (power failure at
00:00:00 UT), the date may not update, and may have to be corrected manually. The
pointing system updates automatically when a new date is entered.
This command requires operator input.
DD
Print Data Directory
DD causes a file listing of the Brewer data directory to be sent to the printer. The printer must
have been turned on with the PN command.
DDP Print Data Directory
DDP causes a file listing of the Brewer program directory to be routed to the printer. The
printer must have been turned on with the PN command.
DDS Print Data Directory to the screen
DDS causes a file listing of the Brewer data directory to be routed to the monitor screen.
DI
Disk Recording
DI causes data to be recorded in the directory as specified in the OP_ST.FIL found in the
Brewer program directory. Data recording may be turned off if the data disk is nearly full, if
the data disk specified is not installed, or if the NR command has been sent. If recording is
turned off, the screen will display "DISK TURNED OFF" on the screen in place of the
"BYTES" message, and must be turned on with DI. See also the NR command.
DS
Direct Sun Ozone Observation
DS results in an O
Brewer Zenith Prism and Azimuth Tracker are oriented toward the sun, the Iris is closed,
FW#1 is rotated to the Ground Quartz Disk (position 1), and FW#2 is adjusted for maximum
intensity (starting from position 2) without overdriving the PMT detector. Data is recorded on
disk and is printed as previously determined by PN, PD, and PF commands.
A DS observation consists of five sets of 20 cycles of the slit mask (a measurement), each
cycle taking a reading for 2*0.14 seconds on each wavelength. Intensity data for six
wavelengths, and the dark count, is recorded for each of the five measurements.
The Azimuth and Zenith positions are updated after each measurement.
After each measurement O
processed, resulting in a single summary set for the total observation.
As a safety feature to prevent damage to the detector, the measurement may terminate if, as
a result of varying cloud conditions, FW#2 has initially been set to a low attenuation value
and clouds suddenly move out of the field of view.
A DS measurement takes slightly more than three minutes to complete.
Details of the data as recorded in the raw data (B) file, and the summary data as recorded in
the summary (S) file can be found in Appendix A.
DSP Dispersion Test
DSP allows for the collection of data for a dispersion test analysis wherein absorption
coefficients, wavelength vs. step number and resolution vs. step number equations for each
slit is determined.
This is a command generally reserved for factory use or for use during an instrument
recalibration.
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observation being taken using the direct sun as a radiation source. The
3
are calculated. After the fifth measurement all data is
3
MKIII OPERATOR'S MANUAL
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