TSI Instruments Aerotrak 9303 - Page 52

3-10 AeroTrak
®
Handheld and Remote Airborne Particle Counters
1. Follow the disassembly instructions to remove the optics block from
the chassis.
2. Reconnect the main board to the optics block along with the keypad
to the main board. This will allow you to power up the laser for setup.
DO NOT apply power to the unit at this time.
3. Remove the
beam block from
the optics block.
Remove the
Phillips head
screw holding
the beam block
in place and pull
the beam block
straight out of
the optics
assembly.
4. Insert the laser
alignment mask
into the optics
assembly where
the beam block
was removed.
Align the notch
in the mask with
the threaded
mounting hole in
the optics block.
5. Connect DVM across TP2 & TP5 on detector board. Set DVM to volts
DC. This will be used to measure the laser current (voltage across a
1 ohm resistor). Example: 0.075 volts = 75 mA.
TP2
TP5