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7-2 General Measurement Setup AM/FM/PM Analyzer (Option 509)
7-2 PN: 10580-00349 Rev. M Spectrum Analyzer MG
7-2 General Measurement Setup
Refer to your instrument User Guide for instructions on setting up frequency, span,
amplitude, GPS, limit lines, markers, and file management.
1. Connect an antenna that is suitable for the measurements.
2. If the instrument is currently in a different measurement mode, switch to AM/FM/PM
Analyzer mode. Refer to
“Selecting a Measurement Mode” on page 1-1 .
3. Press the
Setup
main menu key, then press the
Demod Type
submenu key to toggle the
setting to AM, FM, or PM signal analysis. The active setting is underlined on the
submenu key face.
4. While in the Setup menu, you may choose to set the
IFBW
(IF Bandwidth) or to turn On
or Off the automatic IFBW (by pressing the
Auto IFBW
submenu key). The available
values for IFBW are: 1 kHz, 3 kHz, 10 kHz, 30 kHz, 100 kHz, and 300 kHz.
If the Auto IF BW function is
On
, then manually changing the IFBW turns it
Off
. When
the Auto IF BW function is
On
, the IFBW is automatically changed to the closest value
that is greater than, or equal to, the span currently set in the
Freq
main menu. If the
span is greater than 300 kHz, then the IFBW is set to 300 kHz.
5. Press the
Freq
main menu key. You can set the frequency in one of two ways:
1. Press the
Center Freq
submenu key to set the desired center frequency. In RF
Spectrum measurements, press the
Set Carrier Freq to Center
submenu key to
adjust the signal position to the center of the display screen.
2. Press the
Signal Standard
submenu key to display the Signal Standards list.
Choose a signal standard and press the
Enter
key. The current signal standard is
displayed at the top of the sweep window. The frequency is automatically set
when the signal standard is selected.
Press the
Channel
submenu key to open the Channel Editor dialog and select a
channel.
6. Press the
Span
submenu key and set a span value.
7. Press the
Amplitude
main menu key to open the RF Amplitude menu. Here you may
set the scale or the power offset.
8. Press the
Measurements
main menu key to open the Measurements menu.
9. From the Measurements menu, choose RF Spectrum, Audio Spectrum,
Audio Waveform, or Summary.
Note
If Demod Type is set to FM or PM, then the Set Carrier Freq to Center function
aligns the carrier to center only if the carrier is within the IFBW from the center
frequency.
Note
Measurement values for SINAD, THD, and Distortion/Total apply only to single
tone modulation. For better accuracy of these measurements, the modulation rate
should be at least 0.7% of IFBW. For Distortion Measurements, the IFBW should
be at least twice the maximum modulation rate + deviation.