PASCO h/e Apparatus, Инструкция по эксплуатации

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012-04049J h/e Apparatus and h/e Apparatus Accessory Kit
5
®
4.
Turn on the Light Source and allow it to warm up for
five minutes. Check the alignment of the Light Source
and the Aperture by looking at the light shining on the
back of the Lens/Grating assembly. If necessary, adjust
the back plate of the Light Aperture Assembly by loos-
ening the two retaining screws (Figure 8) and sliding
the aperture plate left or right until the light shines di-
rectly on the center of the Lens/Grating Assembly.
5.
Insert the Coupling Bar assembly into the lower
mounting groove of the Light Source (Figure 5). Se-
cure in place by tightening the thumbscrew against the
front of the Light Source housing.
6.
Remove the screw from the end of the Support Base
rod. Insert the screw through the hole in the Support
Base plate and attach the rod to the Support Base plate
by tightening the screw (use Phillips drive screwdriver).
7.
Place the h/e Apparatus onto the Support Base
Assembly.
8.
Place the Support Base assembly over the pin on the
end of the Coupling Bar assembly.
9.
Connect a digital voltmeter (DVM) to the OUTPUT
terminals of the h/e Apparatus. Select the 2V or 20V
range on the meter.
10.
Set the h/e Apparatus directly in front of the Mercury
Vapor Light Source. By sliding the Lens/Grating as-
sembly back and forth on its support rods, focus the
light onto the white reflective mask of the h/e Appara-
tus (Figure 9).
11.
Roll the light shield of the Apparatus out of the way to
reveal the white photodiode mask inside the Appara-
tus. Rotate the h/e Apparatus until the image of the
aperture is centered on the window in the photodiode
mask. Then tighten the thumbscrew on the base
support rod to hold the Apparatus in place.
12.
As in step 9, slide the Lens/Grating assembly back and
forth on its support rods, until you achieve the sharpest
possible image of the aperture on the window in the
photodiode mask. Tighten the thumbscrew on the Lens/
Grating assembly and replace the light shield.
13.
Turn the power switch ON. Rotate the h/e Apparatus
about the pin of the Coupling Bar Assembly until one
of the colored maxima in the first order shines directly
on the slot in the white reflective mask. Rotate the h/e
Apparatus on its support base so that the same spectral
maxima that falls on the opening in the White Reflec-
tive Mask also falls on the window in the photodi-
ode mask.
➤
NOTE: The white reflective mask on the h/e
apparatus is made of a special fluorescent material.
This allows you to see the ultraviolet line as a blue
line, and it also makes the violet line appear more
blue. You can see the actual colors of the light if
you hold a piece of white non-fluorescent material
in front of the mask. (The palm of your hand works
in a pinch, although it fluoresces enough that the
UV line will still be visible.)
When making measurements it is important that
only one color falls on the photodiode window.
There must be no overlap from adjacent spectral
maxima.
Figure 9. h/e Light Shield
Figure 8. Light Aperture Adjustment
Light Shield
(shown tilted to
the open position)
Window to
White Photodiode
Mask
Base Support Rod
White
Reflective
Mask