Wavetek 147 Dokumentacja Pobierz pdf (Strona 270)

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

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Fig. 13-21 The Operator Information Screen

Frequency Adjustments

The FRQ soft key is used to set the start and stop frequency (for display

purposes only). A Start and Stop soft key is displayed to select the

parameter to be changed. You can be increment or decrement the frequency

with the diamond keys, or enter a specific value using the numeric keys

followed by the Enter key.

From the FREQUENCY submenu, you can use the Marker Zoom function to

change the start and stop frequencies so that they coincide with the marker

value. Use the Undo soft key to return to the original start and stop values.

Press the FRQ soft key again to return to the main sweep display.

Level Adjustments

The LVL soft key is used to adjust the vertical parameters of the graph.

These parameters include the reference level and the scale. The reference

level is the midpoint level displayed on the graph. It can be adjusted using

the diamond keys or by entering a numeric value followed by the Enter key.

The scale parameter (1,2,5, & 10 dB/div) can be adjusted only with the

cursor keys. For example, if the reference level was set at 2 dB and the

scale was set at 5 dB/div, the first horizontal grid line above the center would

be equal to 7 dB. Use the Auto Scale soft key to set the reference level

automatically for an optimum sweep display. Pressing the FCN and Scale

keys will also automatically scale the sweep display. Press the LVL soft key

to return to the main sweep display.

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