TYPE*
Induces the CM112 only, to change between additive and subtractive mode. Consult Spectral Products before using this
command!!
To CM112:
<57>
D
From CM112:
<Status byte>
CM112 Action:
If <Type> is <01> , then the monochromator will subsequently operate in the additive mode. If
<Type> is <254>, then the monochromator will subsequently operate in the subtractive mode. The
monochromator will return to the zero order position in both cases.
From CM112:
<24>
D
UNITS
This command allows the selection of units used in the
GOTO
,
SCAN
,
SIZE
, and
CALIBRATE
commands.
To CM110/112:
<50>
D
<Units Byte>
From CM110/112:
<Status byte>
CM110/112 Action: If units byte is valid, the CM110/112 will move to the zero order position. The specified units will
be used in subsequent commands. Note: Each grating may have a different type of unit specified.
Ex; Grating 1 = Å, grating 2 = nm. The valid units bytes are listed below.
<Units Byte>
<Spectral Units>
00 Microns
01 Nanometers
02 Angstroms
From CM110/112:
<24>
D
ZERO
This command allows the recalibration of the position of the zero order transmission of the monochromator. Note: on a
CM112, this will Zero both gratings at the same time. The monochromator should be set to the peak of the zero order
transmission for each grating while wavelength = 0 using INC, then the zero command is entered.
CAUTION: Use of this command will erase factory settings.
To CM110/112:
<52>
D
<1>
D
CM110/112 Action: The current zero offset values of the gratings are saved as the zero order position.
From CM110/112:
<Status Byte>
From CM110/112:
<24>
D
*Note: The CM112 has separate digital drives in each cascaded monochromator and can be used in additive or subtractive
mode. Additive dispersion provides better resolution. Subtractive dispersion provides better imaging and low
temporal dispersion.
In additive dispersion, the two gratings rotate in the same direction. The grating of the first monochromator spreads
the spectrum over an angular range. The grating of the second monochromator doubles this dispersion.
Spectral Products
2659-A Pan American Frwy., NE Albuquerque, NM 87107 Tel (505) 343-9700 Fax (505) 343-9705
www.spectralproducts.com
11
In subtractive dispersion, the two gratings rotate in opposite directions. The first monochromator is used to select a
band pass. The second monochromator removes temporal and angular aberrations introduced by the first
monochromator.
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