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