Operation
12
Performance Notes
The Series 4410 wattmeter is sensitive to the presence of amplitude modulated
signals and this can affect the accuracy. However, small amounts of AM (up to
10%) are tolerable, but for every 1% of AM, the inaccuracy of the reading may
increase by up to 1% beyond the rated accuracy. Use above 10% AM is not
recommended. The stated accuracy does not include the effect of the less-than-
infinite directivity of the element used. This is generally insignificant except for
reflected power measurements where VSWR is low.
Although the Series 4410 Wattmeter is equipped with Quick-Change connector
types, it must be remembered that the power rating and insertion loss may be
affected if other connectors are used. Power limits must be governed by the
type of connector or transmission line used. For other types of Quick-Change
connectors, see
"Replacement Parts List" on page 22
.
When the range switch of the Series 4410 Wattmeter is set in one of the
numbered positions; i.e., other than OFF or BATT, it is normal for the meter to
drift or deviate off the zero setting. This condition occurs when no element is in
the line section socket or if the element is rotated 90° in the line section to a
shorting position.
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