Tektronix RFM150, Инструкция по эксплуатации

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Making Measurements
RFM 150 Instruction Manual 2–33
Hum
Measuring hum. Press the front-panel MEAS key. The function keys
are assigned to HUM, C/N, and FM DEV; select HUM. The hum
measurement screen (Figure 2–15) is displayed.
LOW
CHAN
LOW
PILOT
MID
CHAN
HIGH
PILOT HIGH
CHAN
+36.2
dBmV
2.0%
VISUAL
HUM
Chan 71 505.25 MHz
HUM
(0.0 )
(peak–peak)
Outline indicates signal being
measured is the MID CHAN preset.
Visual carrier level
Total hum
Function keys are
assigned to presets.
Figure 2–15: The hum measurement mode display
The top line of the screen shows the channel number and frequency
of the channel being measured, along with the instrument mode
(HUM). The function key labels indicate the five preset frequencies.
Table 2–8 shows the key actions in this mode.
Table 2–8: Functions of active keys in hum measurement mode
Key Action
Menu keys Enters selected menu. (Aborts a partial keypad entry.)
Function keys Tune instrument to preset frequencies. Override partial keypad entry.
Knob Tunes instrument according to 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 2–33
Hum
Measuring hum. Press the front-panel MEAS key. The function keys
are assigned to HUM, C/N, and FM DEV; select HUM. The hum
measurement screen (Figure 2–15) is displayed.
LOW
CHAN
LOW
PILOT
MID
CHAN
HIGH
PILOT HIGH
CHAN
+36.2
dBmV
2.0%
VISUAL
HUM
Chan 71 505.25 MHz
HUM
(0.0 )
(peak–peak)
Outline indicates signal being
measured is the MID CHAN preset.
Visual carrier level
Total hum
Function keys are
assigned to presets.
Figure 2–15: The hum measurement mode display
The top line of the screen shows the channel number and frequency
of the channel being measured, along with the instrument mode
(HUM). The function key labels indicate the five preset frequencies.
Table 2–8 shows the key actions in this mode.
Table 2–8: Functions of active keys in hum measurement mode
Key Action
Menu keys Enters selected menu. (Aborts a partial keypad entry.)
Function keys Tune instrument to preset frequencies. Override partial keypad entry.
Knob Tunes instrument according to 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.