Wavetek 147 Spécifications télécharger pdf (Page 257)

Description and Basic Operation of the SDA-5500 and 5510: Basic Modes of Operation

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When the SCAN key is pressed, a graph showing all carrier levels is

displayed. Use the right and left diamond keys to position the marker to the

desired channel. The channel numbers can also be entered directly using

the numeric entry keys.

The up and down diamond keys can be used to adjust the reference level of

the graph.

Level Adjustments

Press the LVL soft key to edit the scale and reference level of the Scan

display. To adjust the scale, use the up and down diamond keys to select a

scale that will provide the best viewing of the carrier levels. To adjust the

reference level, press the Ref Level soft key. Now the reference level can be

changed by using the up and down diamond keys or by entering a numeric

value followed by the Enter key. The reference level is on the top line of the

graph.

Pressing the Auto Scale soft key will automatically set the reference level

for an optimum Scan display. The FCN + Scale key can also be used to

automatically set the reference level.

Frequency Adjustments

Press the FRQ soft key to edit frequency range parameters of the Scan

display. Press the start soft key and then use the up and down diamond keys

or the numeric entry keypad to set the start frequency. Press the Stop soft

key to adjust the stop frequency. The Full Span soft key can be used to set

the start and stop frequency to the full range of the unit.

Press the Tilt soft key to turn tilt compensation on or off. Tilt channels must

be programmed from the EDIT PARAMETERS screen of the CHANNEL

PLAN menu before this function can be used. The tilt is based on the levels

of the highest and lowest channels configured for tilt.

When turned on, the compensation value can be adjusted using the up and

down diamond keys or by entering a numeric value followed by the Enter

key. When tilt compensation is in effect, a TILT ON indicator appears in the

upper left portion of the scan screen.

Scan Rate

Two scan rates are available in the Scan mode, normal and fast. The scan

rate is selected in the MEASUREMENT setup menu. The fast scan feature

allows for rapid scan displays, while sacrificing accuracy (as much as 2 dB

on scrambled channels). Normal scan rate is slower, but much more

accurate. An indicator appears in the upper left hand corner of the Scan

screen when the Fast Scan mode is selected.

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Wavetek 147 Spécifications Page 257