KI 734x/774x UM-12
43
CALIBRATION AND MAINTENANCE
Check the calibration certificates on your reference equipment to
ensure current validity.
•
Put the instrument in calibration mode.
•
Connect a calibrated power meter with a known good
patch lead (the patch lead loss forms part of the
calibration condition).
•
Press [Source], leave in, and then press [
] and
[Level]. The display will now show the expected power
level, cal factor (main display) and laser current in mA
(top right). Note the existing values for future reference.
Set meter wavelength to match.
•
Adjust the [-/+] button to change the source output level,
to match the displayed level on the source display, or to
re-enter a known cal factor (The laser current cannot go
above a level that has been set for the individual laser
during manufacture).
•
Note new calibration values and laser currents for future
reference, then press [Set] to store settings and exit, or
[Exit] to exit without storing settings.
•
Remove the programming shunt, and place a new
sticker over the aperture.
ORL Calibration
Calibration is performed by setting up a known reflection condition and
adjusting the reading accordingly. A convenient calibrated reflections
are good clean PC terminations, which will have glass/air reflection
–
14.26 dB for SMF and -14.15 dB for MMF. This can be double-checked
easily by measuring more than one termination.
Required: reflections, an anti-tamper label and a 2.54
mm (0.1”)
programming jumper.
•
Put the instrument in calibration mode.
•
On the meter to be calibrated, record the existing
calibration offsets:
Select [Return Loss], [-/+] to set the wavelength, then [
] and [Max/Min] twice to display the offsets. Note them
down, or re-enter known offsets at this point.
•
Attach the known reflection. You may also want to add an
allowance for twice the expected forward loss of the
connection to the instrument.
•
Set [
] and [Max/Min] to display power, then [-/+] to
adjust the reading to the required value.
