Anritsu Site Master S331D Guía de usuario descargar pdf (Pagina 54)

Auto Scale

The Site Master can automatically set the scale to the minimum and maximum values of

the measurement on the y-axis of the graph. This function is particularly useful for mea-

surements in SWR mode. To automatically set the scale, press the AUTO SCALE key.

The Site Master will automatically set the top and bottom scales to the minimum and maxi-

mum values of the measurement with some margin on the y-axis of the LCD.

Amplitude Scale

The following procedure sets the top and bottom scale display.

Step 1.

Press the AMPLITUDE key to call up the Scale Menu.

Step 2. Press the

Top soft key and use the keypad or Up/Down arrow key to edit the top

scale value. Press ENTER to set.

Step 3. Press the

Bottom soft key and use the keypad or Up/Down arrow key to edit the

bottom scale value. Press ENTER to set.

NOTE: Typically the y-axis scale of the graph is 0-60 dB (return loss) but for

some measurements (for example, insertion loss) the scale may be changed to

0-10 dB. If the scale is not changed, some measurement results may not be

easily viewed on the screen.

Set the Distance and Cable Type

In Distance-To-Fault (DTF) mode, the length of the transmission line (distance) and cable

type are selected. The cable type determines the velocity propagation and cable attenuation

factor. The following procedure can be used to set the distance and select the appropriate

cable type.

NOTE: Selecting the correct cable is very important for accurate measurements

and for identifying faults in the transmission line. Selecting the incorrect cable,

or using the correct cable out of its proper frequency characteristics type, will

shift the DTF trace vertically and horizontally making it difficult to accurately lo-

cate faults.

Step 1.

Press the MODE key.

Step 2. Select

DTF Return Loss or DTF SWR mode. The Site Master automatically sets

D1 to zero.

Step 3. Press the

D2 soft key.

Step 4. Enter the appropriate D2 value for the maximum length of the transmission line

and press the ENTER key to set the D2 value.

Step 5. Press the

DTF Aid soft key.

3-8

Chapter 3 Getting Started

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Anritsu Site Master S331D Guía de usuario Pagina 54

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