3–6
3.0 Installation
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
Signal connections should now be installed from the control unit TS2: -7
(plus), 6 (common) (see dwg. C-15245).
3.5
Optical Alignment
The object of optical alignment is to bring the optimum source energy
to the detector. Generally the optimum energy will be the maximum
amount of energy which can be focused on to the detector. This can be done
by adjusting the various elements in the source module (see dwg. C-14628).
WARNING:
The light intensity from the quartz iodine lamp is intense and
should not be looked at directly without special protective
eyewear. Protective goggles with shaded lenses (Fed. Spec.
#5) should be worn if it is necessary to look directly at the
source.
Use a Variac on the input AC line to reduce the voltage and the lamp
intensity to a tolerable level.
1. Vertical lamp position is achieved by loosening the screws of
the base lamp bracket and moving the assembly up or down.
2. Horizontal position is achieved by loosening the Allen screw at
the base of the lamp holder which allows side to side movement
of the lamp.
3. Beam focusing is then achieved by loosening the lens holding
bracket and moving the lens back and forth until the best
focusing is obtained.
4. First visually optimize the lamp energy using a white piece of
paper at various locations in the light path. Make adjustments as
in steps 1, 2, and 3 above.
5. Then electronically optimize the energy as follows (the preamp
must be installed in the detector compartment):
a. Insert an extender card in the switch driver and clamp
position (remove keys as necessary).
b. Connect an oscilloscope to pin 6 (video from pre-amp),
and pin 3 (ground).
c. Remove the lens assembly from the light path.
d. Optimize lamp energy by adjusting the lamp position as
described in steps 1 and 2 above.
e. Replace the lens assembly.
f. Focus the lamp as described in step 3 to give the
maximum peak heights displayed on the oscilloscope.
g. If a Variac was used to alter the light intensity,
disconnect it and reconnect source to power supply.