Tektronix RFM150, Instruction Manual

Page: 63 / 278

Making Measurements
RFM 150 Instruction Manual 2–17
Analog Channel Measurement.
The instrument makes two measure-
ments on the tuned channel (shown in Figure 2–7). The top portion
of the display is the visual carrier (taken as a sine wave at the peak of
the modulating envelope). The lower portion of the screen displays
the aural carrier level difference, expressed relative to the visual
carrier level. If the analog channel is a two-carrier sound channel,
both of the aural carrier level differences are measured, relative to
the visual carrier.
Outline indicates which
preset is being measured
Aural carrier level,
relative to visual carrier
level
Visual carrier level
The function keys are
assigned to the presets
+35.0
dBmV
LOW
CHAN
–10.6
VISUAL
D
AURAL
LOW
PILOT MID
CHAN HIGH
PILOT HIGH
CHAN
Chan 2
55.25 MHz
1 CHAN
dBc
(0.0)
(+4.5 MHz)
R
Figure 2–7: The 1 channel mode (analog channel)
Digital Channel Measurement. The RFM 150 1 Channel mode
measures the average power of a digital channel.
NOTE . To prepare for measuring the power of a digital channel, you
must use the CSS150 software. Refer to the CSS150 User Manual for
instructions on creating a custom channel table (channel table
editing) and loading channel tables into the RFM 150.
To measure a digital channel, proceed as follows.
1. Use the CSS150 software to create a custom channel table with
the following information:
Making Measurements
RFM 150 Instruction Manual 2–17
Analog Channel Measurement.
The instrument makes two measure-
ments on the tuned channel (shown in Figure 2–7). The top portion
of the display is the visual carrier (taken as a sine wave at the peak of
the modulating envelope). The lower portion of the screen displays
the aural carrier level difference, expressed relative to the visual
carrier level. If the analog channel is a two-carrier sound channel,
both of the aural carrier level differences are measured, relative to
the visual carrier.
Outline indicates which
preset is being measured
Aural carrier level,
relative to visual carrier
level
Visual carrier level
The function keys are
assigned to the presets
+35.0
dBmV
LOW
CHAN
–10.6
VISUAL
D
AURAL
LOW
PILOT MID
CHAN HIGH
PILOT HIGH
CHAN
Chan 2
55.25 MHz
1 CHAN
dBc
(0.0)
(+4.5 MHz)
R
Figure 2–7: The 1 channel mode (analog channel)
Digital Channel Measurement. The RFM 150 1 Channel mode
measures the average power of a digital channel.
NOTE . To prepare for measuring the power of a digital channel, you
must use the CSS150 software. Refer to the CSS150 User Manual for
instructions on creating a custom channel table (channel table
editing) and loading channel tables into the RFM 150.
To measure a digital channel, proceed as follows.
1. Use the CSS150 software to create a custom channel table with
the following information: