Tektronix RFM150, Instruction Manual

Page: 90 / 278

Making Measurements
2–44 RFM 150 Instruction Manual
Centering the trace.
If the trace is off-screen, an arrow next to the
CENTER LVL readout (upper left corner of the screen) indicates the
direction of the trace position (see Figure 2–20).
Selecting KNOB–LVL assigns the knob to control the center level in
1 dB steps. This will effectively move the trace up and down on the
screen. The CENTER LVL readout value will indicate the new
center screen reference value.
Selecting LVL/REF MENU, then CENTER TRACE will center the
trace on screen, and adjust the center level accordingly.
Vertical resolution.
The resolution can be set to 1 dB or 2 dB per
division. Select LVL/REF MENU, then select 2 dB/ or 1 dB/. The
present setting is indicated below the instrument mode in the upper
right corner of the display. See Figure 2–21.
CENTER LVL: +0 DB
SWEEP
VERT
2 dB/div
REFERENCE: HEADEND
CENTER
TRACE
2 dB/ 1 dB/
REF
MENU
M1: 139.25 MHz
+95.3 dBuV
M2: 409.25 MHz
+88.3 dBuV
Outline
shows that
marker 1
is active.
Marker 1
frequency
Level
reading
Marker 2
frequency
Level
reading
Active sweep reference
Vertical
resolution
Press to enter the reference menu. Outline shows that
2 dB/div is selected.
Figure 2–21: The sweep LVL/REF submenu display
Store a sweep reference. The results of ‘all channel’ measurements
are used for the sweep references. For example, you can store an all
channel mode record at the head end, and use it as a reference for
field measurements.
Making Measurements
2–44 RFM 150 Instruction Manual
Centering the trace.
If the trace is off-screen, an arrow next to the
CENTER LVL readout (upper left corner of the screen) indicates the
direction of the trace position (see Figure 2–20).
Selecting KNOB–LVL assigns the knob to control the center level in
1 dB steps. This will effectively move the trace up and down on the
screen. The CENTER LVL readout value will indicate the new
center screen reference value.
Selecting LVL/REF MENU, then CENTER TRACE will center the
trace on screen, and adjust the center level accordingly.
Vertical resolution.
The resolution can be set to 1 dB or 2 dB per
division. Select LVL/REF MENU, then select 2 dB/ or 1 dB/. The
present setting is indicated below the instrument mode in the upper
right corner of the display. See Figure 2–21.
CENTER LVL: +0 DB
SWEEP
VERT
2 dB/div
REFERENCE: HEADEND
CENTER
TRACE
2 dB/ 1 dB/
REF
MENU
M1: 139.25 MHz
+95.3 dBuV
M2: 409.25 MHz
+88.3 dBuV
Outline
shows that
marker 1
is active.
Marker 1
frequency
Level
reading
Marker 2
frequency
Level
reading
Active sweep reference
Vertical
resolution
Press to enter the reference menu. Outline shows that
2 dB/div is selected.
Figure 2–21: The sweep LVL/REF submenu display
Store a sweep reference. The results of ‘all channel’ measurements
are used for the sweep references. For example, you can store an all
channel mode record at the head end, and use it as a reference for
field measurements.