Kipp & Zonen Brewer Mk III Operator's Manual page 44

GS Gratings Data Collection
GS initiates a routine that collects data required to calculate Grating Slope and Grating
Intercept values, which ensure that the two gratings are synchronised during scanning.
The routine performs a scan on slits 1 through 5. Data is written to a GSJJJYY.nnn file, and
can be processed by the RD_GS.EXE program to calculate the Grating Slope and Grating
Intercept to ensure that the two gratings are synchronised during scanning operations.
GS and RD_GS.EXE are normally run by as part of factory set-up operations or when
problems are experienced with the micrometers or gratings.
HG Mercury Wavelength Calibration
HG is used to accurately locate the 302.15 nm line of the Mercury spectrum, and then adjust
the diffraction grating such that the five ozone operational wavelengths fall onto the
appropriate exit slits.
The zenith prism rotates to the test lamps (position 0), the iris is opened, FW#1 is rotated to
the quartz disk (position 1), FW#2 to ND=0 (position 0).
Following the initial set-up and lamp warm-up, the grating is scanned in the forward and
reverse direction and the resulting combined spectrum is compared to a stored spectrum.
Corrections to the micrometer position are made, and if the adjustment required is greater
than 2 steps (.012nm) then the scan is repeated. A test for the presence of Hg lamp radiation
is made prior to the beginning of the scan, and if it is not there, an FR test is done to
reposition the micrometers to pre-set initialisation values and the test is redone. See also
Appendix F and Appendix A.
HGSUM Mercury Lamp Summary
HGSUM reads the daily Data (B) file and prints out the 'summary' results of the day's HG
calibrations. In addition an entry is made in the HGOAVG.nnn file.
The HGSUM command is usually invoked as part of the ED command.
See also Appendix A for an explanation of the HGOAVG.nnn file.
HP Grating Synchronisation
It is important that the two micrometers remain synchronised such that they are both set to
the same wavelength. The HP test tests for this condition and makes an adjustment, if
necessary.
For this test the Standard lamp is used as a light source. The Standard Lamp is turned on,
the prism is pointed to lamps, the Iris is opened, FW#1 is set to position 1, and FW#2 is set
to position 0. Micrometer #2 is then moved relative to Micrometer #1, and is adjusted such
that maximum intensity will occur - an adjustment of more than 10 steps results in the test
being repeated.
HV High Voltage Test
The HV command invokes a test used to determine the optimum high voltage setting for the
photomultiplier. The HVSET command can then be used to set the High Voltage.
This test is normally used in the factory during the final set-up stages of manufacture, or in
the field if it is suspected that the setting is not correct.
The Standard Lamp is turned on, the iris is opened, FW#1 is put to position 1, and FW#2 is
set to position 0.
See the HVSET command, and Appendix F for more details on the HV test.
HVSET High Voltage Set-up
The HVSET command can be used to adjust for the optimum High Voltage as determined be
the HV test.
IC Instrument Configuration File Update
The IC command results in a display of the Instrument's current configuration and allows
changes to be made by the operator.
See Appendix B for details of the configuration options available.
MKIII OPERATOR'S MANUAL
4. BREWER COMMANDS
41