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KI 734x/774x UM-12
44
CALIBRATION AND MAINTENANCE
Note:
The ORL is measured only when entering this mode. It is not
continuously updated.
•
Set [
] and [Max/Min] to read and note the new stored
calibration offsets, and then [Set] to store and exit, or
[Exit] to exit without storing settings.
•
Remove the programming shunt, and place a new sticker
over the aperture.
Opening the Instrument:
Caution!
Do not open unless the warranty has expired, and you are
authorised to do so. Opening the unit will invalidate any warranty
claim.
•
There are no internal user adjustments. All calibration is
performed without opening the instrument. The optical
sensor / connector assembly is not user serviceable.
•
This unit contains static sensitive devices. Anti-static
handling procedures should be observed at all times
when handling internal circuits.
•
Do not open this instrument unless you are familiar with
handling optical fibers. Disturbing the optical fiber
assembly may result in instrument malfunction or
damage.
Procedure:
•
Use static protected procedures.
•
Remove the batteries, and leave the battery cover open.
Pull open the optical connector covers.
•
Place the instrument face down on a soft mat, and undo
the 6 screws in the rear housing.
•
The instrument can now be gently pulled apart.
•
The instrument will come into two halves joined by a
ribbon cable. The optical section is located in the upper
half, with the microprocessor, supply, calibration
constants and controls in the lower half.
•
The hinged display cover can be removed at this point.
•
The ribbon connector can be disengaged to completely
separate the instrument halves.
•
Further disassembly from this stage should be easily
apparent to a technician.
•
Re-assembly is the reverse of the previous procedure.
Ensure that the ribbon cable connectors are properly
secured so they cannot shake loose. This will be either
a moulded rubber retainer, or adhesive tape.
General electrical parameters are as follows: Vss to GND = 3V3, -Vss
= -3V3, battery power down current about 0.2 mA, active power meter
current about 20 mA. The laser current is unpredictable.