Agilent Technologies N3970A User Manual

Page 26

N3970A UM-1

■

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.