Wavetek 147 Spécifications télécharger pdf (Page 85)

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101

Field Sweeping with the SDA-5000: Test Point Compensation

Use the top right-hand soft key to toggle between

forward and reverse test point displays.

Use the top left-hand soft key to return to the previous

screen.

Use the bottom right-hand soft key to enter the current

value from the Edit Box into the test point loss table.

2. The forward test point display has two entries:

• The top item (EXTERNAL) is to allow for external pads, coupling

networks, or any amplifiers you might use. It is important to note that a

pad has a positive value (loss), while an amplifier has a negative value.

• You should enter the amplifier test point loss in the second line

(PROBE). Typically this is 20, 25, or 30dB. Positive values represent

loss, and are the norm. A negative value represents an amplifier.

Fig. 4-3 shows a 20dB test point, and an external splitter provides 3.5dB

additional loss.

Fig. 4-1 The FWD COMPENSATION Screen

3. The reverse test point display contains more adjustments and

information (see Fig. 4-2).

The soft keys for this screen have the same function as those on the

FWD COMPENSATION screen, with the addition of an Information

soft key.

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Wavetek 147 Spécifications Page 85

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