Agilent Technologies 8510C, Operating And Programming Manual

Page: 378 / 391

Programming Examples
Cleaning the LCD
Use a soft cloth and, if necessary , a cleaning solution recommended for optical coated surfaces.
Agilent part n um b er 8500-2163 is one suc h solution.
Deguass (Demagnetize) the Display (CRT Only)
If the display b ecomes magnetized, or if color purity is a problem, cycle the p o w er sev eral
times. Lea v e the instrumen t o for at least 15 seconds b efore turning it on. This activ ates
the automatic degaussing circuit in the analyzer display . If this is insucien t to ac hiev e color
purity , a commercially a v ailable demagnetizer m ust b e used (either a CR T demagnetizer or a
bulk tap e eraser can b e used). F ollo w the man ufacturer's instructions k eeping in mind the
follo wing: it is imp erative that at rst it b e placed no closer than 4 inc hes (10 cm) from the
face of the CR T while demagnetizing the display . If this distance is to o far to completely
demagnetize the CR T, try again at a slightly closer distance un til the CR T is demagnetized.
Generally , degaussing is accomplished with a slow rotary motion of the degausser, moving it in
a circle of increasing radius while simultaneously moving a w a y from the CR T.
Caution
Applying an excessiv ely strong magnetic eld to the CR T face can destroy the
CR T.
Lik e most displays, the CR T can b e sensitive to large magnetic elds generated from
unshielded motors. In coun tries that use 50 Hz, some 10 Hz jitter may b e observ ed. If this
problem is observ ed, remov e the device causing the magnetic eld. Figure Figure 14-3 sho ws
the motion for degaussing the display .
Figure 14-3. Motion for Degaussing the Display
Inspect the Error T erms
Error terms (E-terms or calibration co ecien ts) are an indication of the condition of the
instrumen t, its calibration kits, and cables. When track ed o v er a p erio d of time, error
terms can signal and iden tify system comp onen t and p erformance degradation. Error
term comparisons are b est made with data generated p erio dically b y the same system and
calibration kit (the kit normally used with the analyzer). F or this reason, generating error
terms at the time of installation and at regular in terv als thereafter is recommended.
A log b o ok can b e a helpful to store the error term plots. Error term plots are generated b y
p erforming the v erication pro cedure.
Operator's Check and Routine Maintenance 5