Chapter 5
Using Interference Analyzer
120
JD700B Series User’s Guide
NOTE
To be able to load a trace, the trace to be overlaid must be saved in the same
measurement mode and frequency setting as the current measurement.
Sound indicator
You can use the Sound Indicator to help you identify interfering signals by sounding an alarm.
Procedure
1
Configure test parameters as described in the “Configuring test parameters” on page 112.
2
Press the
MEASURE SETUP
hot key.
3
Press the
Sound Indicator
soft key.
4
Toggle the
Sound
soft key between
On
and
Off
to enable and disable the alarm sound.
5
Select the alarm reference option from the following choices:
To set the active marker position as the alarm reference, toggle the
Alarm Reference
soft
key and select
Marker
.
To set the limit as the alarm reference, complete the following steps:
Toggle the
Alarm Reference
soft key and select
Line
.
The Limit Line menu becomes activated to be set.
Press the
Limit Line
soft key to define a threshold for the limit line.
Enter a value by using the numeric keys. You can also use the rotary knob.
Press the
dBm
soft key.
6
Optional
. To adjust the volume for alarm sound, press the
Volume
soft key and then turn the
rotary knob clockwise or counter clockwise.
7
Optional
. To select the sound mode for alam, toggle the
Sound Mode
soft key and select the
option from the following choices:
Select the
Mode 1
to create an alarm with a consistent tone (frequency) regardless of the
interference signal.
Select the
Mode 2
to apply the tone step from 1 to 20.
Select the
Mode 3
to apply the tone step from 20 to 1.
8
Optional
. You can save logging data automatically so that you can load the measurement data
and replay in the Spectrum Replayer mode. See “Using save” on page 35 for more information.
AM/FM audio demodulation
You can use the AM/FM Audio Demodulation to identify if the interfering signal is n
th
harmonics of AM/FM
audio. The instrument sounds demodulated signals that you can hear through the speaker or headphones.
Procedure
1
Configure test parameters as described in the “Configuring test parameters” on page 112.
2
Press the
MEASURE SETUP
hot key.
3
Toggle the
Audio Demod
soft key between
On
and
Off
to turn the AM/FM audio demodulation
on and off.
4
Press the
Demod at
soft key, and then select the marker number for the frequency to be
demodulated.
NOTE
You must set the marker(s) first by using the
MARKER
hard key as the AM/FM
demodulator uses the marker position to demodulate. See “Using marker” on page 63 for
more information.
5
Press the
Demod Mode
soft key, and then select the demodulation mode:
AM
,
FM
and
CW
.
6
Press the
Dwell Time
soft key, and then turn the rotary knob to set the demodulation interval
between 1 and 20.
Содержание CellAdvisor JD700B Series
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