Chapter 19
Using Channel Scanner
JD700B Series User’s Guide
739
external offset value is set at 40 dB in the Spectrum mode, the measurement result compensates 40 dB at
both the Spectrum Analyzer and Signal Analyzer modes.
Procedure
To set the external offset:
1
Press the
AMP/SCALE
hard key.
2
Toggle the
External Offset
soft key and select
On
.
3
Enter a value by using the numeric keys.
4
Press the
dB
soft key to complete the entry.
To turn the external offset off:
1
Press the
AMP/SCALE
hard key.
2
Toggle the
External Offset
soft key and select
Off
.
Setting average
You can set the number of measurements to be averaged for the trace presentation. A maximum of 100
times of averaging can be set. When the averaging reaches to your setting, a new measurement value
replaces the measurement value in sequence from the earliest.
Procedure
1
Press the
BW/AVG
hard key.
2
Press the
Average
soft key.
3
Enter a value between 1 and 100 as needed by using the numeric keys.
4
Press the
Enter
soft key.
Setting sweep mode
The default setting is
Continue
to sweep continuously for most on-going measurements. If you want to hold
the measurement or get a single sweep, you can change the sweep mode.
Procedure
To select the single sweep mode:
1
Press the
SWEEP
hot key.
2
Toggle the
Sweep Mode
soft key and select
Single
. You can also use the
HOLD
hot key.
The letter
HOLD
in red appears and the sweeping is paused.
3
Optional
. Press the
Sweep Once
soft key to get a new measurement.
To return to the continuous sweep mode:
1
Toggle the
Sweep Mode
soft key and select
Continue
. You can also use the
HOLD
hot key.
The letter
HOLD
in red disappears and the sweeping resumes.
NOTE
Selecting
Sweep Mode > Fast
may reduce the measurement accuracy, but you can use
this fast sweep mode to identify the existence of interfering signals.