M77781A
MS257
™ USB/RS232
MONOCHROMATOR AND SPECTROGRAPH
49
Micrometer Driven Slit Assembly
The 74002 Micrometer Driven Slit Assembly uses a precision micrometer drive to adjust the slit
width from closed to 3 mm. Apply a 10x multiplier to the micrometer markings to readout the slit
opening; thus, each mark on the micrometer barrel corresponds to 10 µm of slit width. The
“0”
position on the micrometer is the closed position. The height is also continuously adjustable from
3 mm to 12 mm tall, using the manual slide. As a precaution against damaging the slit blades, do
not adjust beyond its normal operating range.
Please note that optimum spectral resolution for any monochromator is obtained with short,
narrow slits. The 74002 is designed primarily for versatility and convenience in changing
resolution and throughput. Fixed slits should be used for the greatest degree of accuracy and
repeatability, especially at high resolution.
Specifications
Slit W idth: Closed to 3 mm
Slit Height: 3 mm to 12 mm
Precision, W idth: ±10 µm
Accuracy, W idth: ± 10 µm to 250 µm
± 5% from 250 µm to 3 mm
Figure 15: Micrometer Driven Slit Dimensions
