Procedure 2. Degaussing (Demagnetizing) The Crt Display - Agilent Technologies 8510C Service Quick Reference Manual

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8510C Adjustments

Procedure 2. Degaussing (Demagnetizing) the CRT Display

This procedure applies only to instruments equipped with a CRT.

NOTE

The color monitor display is very susceptible to external magnetic fields, such as metal

frame tables, welded cabinet, the earth, unshielded motors, and other sources. The usual

symptom is discoloration or slight dimming of the display (usually near a top corner of the

CRT). In extreme cases, a total color shift may be observed; for example, a trace that was

red may shift to green. This shift does not suggest a problem with the display; it is

characteristic of color displays needing demagnetizing.

If the display becomes magnetized, or if color purity is a problem, cycle the power several

times. Leave the instrument off for at least 15 seconds before turning it on. This activates

the automatic degaussing circuit in the analyzer display.

If this is insufficient to achieve color purity, a commercially available demagnetizer must

be used (either a CRT demagnetizer of a bulk tape eraser can be used). Follow the

manufacturer's instructions keeping in mind the following: it is imperative when

demagnetizing a display that at first it be placed not closer than four inches (10 cm) from

the face of the CRT while demagnetizing the display. If this distance is too far to

completely demagnetize the CRT, try again a a slightly closer distance until the CRT 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 away

from the CRT.

CAUTION

Applying an excessively strong magnetic field to the CRT face can destroy the

CRT.

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