Tektronix RFM150, Instruction Manual

Page: 36 / 278

Tutorial
1–14 RFM 150 Instruction Manual
b. Turn the knob until marker 1 (a solid vertical line) is moved
to the desired frequency. The signal level at that frequency
will be displayed in the lower left portion of the measurement
screen, below the marker 1 frequency.
c. Press F2 again to select MKR2. Turn the knob to set marker 2
(a dashed line) as desired. The signal level at the marker 2
frequency will appear in the lower right corner of the
measurement screen, below the marker 2 frequency.
Difference between the level at
marker 1 and the level at marker 2
Marker 1
frequency
Marker 2
frequency
Level
reading
LVL
MKR1
CENTER LVL: +0 DB
SWEEP
KNOB
2 dB/div
REFERENCE: HEADEND
LVL/REF
MENU
∆
MKR: +0.0 dB
∆
P/V +0.0 dB
y
Active sweep reference
Vertical
resolution
Arrow indicating direction
of off-screen trace
M2: 409.25 MHz
+88.3 dBuV
M1: 139.25 MHz
+95.3 dBuV
Signal level
Marker 1 Marker 2
Difference between the maximum
and minimum signal levels that occur
between marker 1 and marker 2
Figure 1–1: The Sweep display
O. Spectrum Mode
In this mode, the instrument uses very fine steps to plot points and
provide a spectrum of the signal frequency on the horizontal axis and
amplitude on the vertical axis. One of the applications for this
display is spotting signals which should not be present.
1. Press the front-panel SPECT key to access the spectrum mode
display, as shown in Figure 1–2.
Tutorial
1–14 RFM 150 Instruction Manual
b. Turn the knob until marker 1 (a solid vertical line) is moved
to the desired frequency. The signal level at that frequency
will be displayed in the lower left portion of the measurement
screen, below the marker 1 frequency.
c. Press F2 again to select MKR2. Turn the knob to set marker 2
(a dashed line) as desired. The signal level at the marker 2
frequency will appear in the lower right corner of the
measurement screen, below the marker 2 frequency.
Difference between the level at
marker 1 and the level at marker 2
Marker 1
frequency
Marker 2
frequency
Level
reading
LVL
MKR1
CENTER LVL: +0 DB
SWEEP
KNOB
2 dB/div
REFERENCE: HEADEND
LVL/REF
MENU
∆
MKR: +0.0 dB
∆
P/V +0.0 dB
y
Active sweep reference
Vertical
resolution
Arrow indicating direction
of off-screen trace
M2: 409.25 MHz
+88.3 dBuV
M1: 139.25 MHz
+95.3 dBuV
Signal level
Marker 1 Marker 2
Difference between the maximum
and minimum signal levels that occur
between marker 1 and marker 2
Figure 1–1: The Sweep display
O. Spectrum Mode
In this mode, the instrument uses very fine steps to plot points and
provide a spectrum of the signal frequency on the horizontal axis and
amplitude on the vertical axis. One of the applications for this
display is spotting signals which should not be present.
1. Press the front-panel SPECT key to access the spectrum mode
display, as shown in Figure 1–2.