Agilent Technologies N3970A, Operating And Maintenance Manual

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23
N3970A UM-1
■ C
ALIBRATION
& M
AINTENANCE
■
Measure and record the source power using the reference
meter
■
Transfer the same power level to the meter to be calibrated,
set MAX/MIN to display power, then +/- to adjust the
reading to match the noted reference reading. Note: The
optical power is measured only when entering this mode. It
is not continuously updated.
■
Set MAX/MIN to read and note the new stored calibration
offsets, and then SET to store and exit, or CANCEL to
abandon and exit
■
Go back and check the source power with the reference
meter, to ensure source drift is within limits.
■
When calibration is complete, remove the calibration shunt,
and place an anti-tamper label over the hole in the battery
compartment.
■
Do no forget to update your calibration re c o rds, and
schedule the next due date.
Maintenance
CAUTION! Do not open unless the warranty has expired, you are
authorised to do so, and you have a static protected work
station. Opening the unit will invalidate any warranty claim.
There are no internal user adjustable components, fuses, or
calibration features.
The optical sensor / connector assembly is not user serviceable.
Opening the instrument:
■
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 bottom half, with
the micro p ro c e s s o r, supply, calibration constants and
controls in the top half.