Tektronix RFM150, Инструкция по эксплуатации

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Making Measurements
RFM 150 Instruction Manual 2–39
Spectrum Mode
In this mode, the instrument sweeps a frequency band specified by
the center frequency and span/division, then uses fine steps to plot
points and create a graph. This limited spectral display can be used
for spotting signals which should not be present. Press the front-pan-
el SPECT key to access the spectral display, shown in Figure 2–19.
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Reference
(amplitude
level at top
of screen)
REF
MKR
+60 dBmV
SPECTRUM
10 dB/
KNOB
30 kHz
RBW
PEAK SPAN
1 MHz/
Chan 2
55.25 MHz
DETECT
(20)
Probe loss offset
Span/div
Outline indicates the knob is
controlling reference level.
Resolution
bandwidth Average or
peak detection
Function
keys F1
through F3
control the
knob
actions.
+95.3 dBuV
M: 139.25 MHz
Figure 2–19: The Spectrum mode display (analog channel)
Table 2–10 defines key actions.
Table 2–10: Functions of active keys in spectrum mode
Key Action
Menu keys Enters selected menu. (Aborts a partial keypad entry.)
Function keys Perform the action labeled on screen: either assigning knob function or
selecting RBW. Override partial keypad entry.
Knob Controls ref level, marker, or span/div. If none selected, tunes center
frequency, according to active entry mode. Overrides partial keypad
entry.
Numeric keypad Keying either channel or frequency, followed by CHAN, MHz, or ENTER,
tunes the instrument – if chan. or freq. is in the active channel table.
Making Measurements
RFM 150 Instruction Manual 2–39
Spectrum Mode
In this mode, the instrument sweeps a frequency band specified by
the center frequency and span/division, then uses fine steps to plot
points and create a graph. This limited spectral display can be used
for spotting signals which should not be present. Press the front-pan-
el SPECT key to access the spectral display, shown in Figure 2–19.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference
(amplitude
level at top
of screen)
REF
MKR
+60 dBmV
SPECTRUM
10 dB/
KNOB
30 kHz
RBW
PEAK SPAN
1 MHz/
Chan 2
55.25 MHz
DETECT
(20)
Probe loss offset
Span/div
Outline indicates the knob is
controlling reference level.
Resolution
bandwidth Average or
peak detection
Function
keys F1
through F3
control the
knob
actions.
+95.3 dBuV
M: 139.25 MHz
Figure 2–19: The Spectrum mode display (analog channel)
Table 2–10 defines key actions.
Table 2–10: Functions of active keys in spectrum mode
Key Action
Menu keys Enters selected menu. (Aborts a partial keypad entry.)
Function keys Perform the action labeled on screen: either assigning knob function or
selecting RBW. Override partial keypad entry.
Knob Controls ref level, marker, or span/div. If none selected, tunes center
frequency, according to active entry mode. Overrides partial keypad
entry.
Numeric keypad Keying either channel or frequency, followed by CHAN, MHz, or ENTER,
tunes the instrument – if chan. or freq. is in the active channel table.