Agilent Technologies E4406A, Руководство пользователя

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118 Chapter 4
Making Measurements
Making the Channel Power Measurement
In addition, the following parameters for channel power measurements
can be modified by pressing the
Advanced
key:
•
Sweep Time
- Allows you to manually change the sweep time and also
to toggle the sweep time control between
Auto
and
Man
(manual).
The range is 1.000
µ
s to 50.00 ms with 1 or 10
µ
s resolution. The
default setting is 68.27
µ
s and
Auto
.
• Data Points - Allows you to select the number of data points. The
automatic mode chooses the optimum number of points for the
fastest measurement time with acceptable repeatability. The
minimum number of points that could be used is determined by the
sweep time and the sampling rate. You can increase the length of the
measured time record (capture more of the burst) by increasing the
number of points, but the measurement will take longer.
•
Res BW
- Shows information on the resolution bandwidth derived
from the sweep time.
•
Trig Source
- Allows you to choose the trigger source from
Free Run
(Immediate)
,
Video (IF Envl)
,
RF Burst (Wideband)
,
Ext Front
or
Ext Rear
.
Changing the Display
The
Amplitude Y Scale
key accesses the menu to set the desired vertical
scale and associated settings.
•
Scale/Div
- Allows you to enter a numeric value to change the vertical
display sensitivity. The range is 0.10 to 20.00 dB with 0.01 dB
resolution. The default setting is 10.00 dB, however, since
Scale
Coupling
is defaulted to
On
, this value is automatically determined
by the measurement result.
•
Ref Value
- Allows you to enter a numeric value to change the
absolute power value as the display reference. The range is 0.00 to
250.00 dBm with 0.01 dB resolution, however, since
Scale Coupling
is
defaulted to
On
, this value is automatically determined by the
measurement result.
•
Ref Position
- Allows you to set the display reference position to
either
Top
,
Ctr
(center), or
Bot
(bottom). The default setting is
Top
.
•
Scale Coupling
- Allows you to toggle the scale coupling function
between
On
and
Off
. The default setting is
On
. This function
automatically determines the scale per division and reference values
by the measurement results.