R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
3.3.16 POWER Key (Power Measurement)
3-58
3.3.16 POWER Key (Power Measurement)
This section describes the Power menu displayed when the POWER key is pressed.
Channel Power
Activates the measuring window, and displays the Channel menu.
The channel power is calculated using the formula shown below.
P
CH
:
Channel power
P(n):
Data (dBm) for each trace point
SPAN: Current span value
PBW: Noise power bandwidth
X1:
Data position of start frequency on the x-axis.
X2:
Data position of stop frequency on the x-axis.
Channel Position
Allows you to set the center of the measuring window (channel
bandwidth).
Channel Width
Allows you to set the width of the measuring window (channel
bandwidth).
Average Times
Allows you to set the number of times the sweep is averaged.
Power Meas OFF
Removes the window and cancels channel power measurements.
Total Power
Measures the total power in the object range (the entire measure-
ment span or window) and displays it.
The total power is calculated using the formula shown below.
The number of trace points on the horizontal axis is set to 1001.
P
T
:
Total power to be calculated.
P(n):
Data (dBm) for each trace point.
SPAN: Current span value
PBW: Noise power bandwidth
X1:
1
X2:
1001
Average Power
Measures the power averaged over the object range (the entire
measurement span or window) and displays it.
Allows you to set the averaging count used to calculate the aver-
age power.
With average power measurements, the resolution bandwidth
(RBW) is set to a bandwidth wider than the amplitude variation
width (the resolution bandwidth must be at least three times wider
than the occupied bandwidth). The average power is calculated
using the formula shown below.
The number of trace points on the horizontal axis is set to 1001.
P
CH
= 10log [
∑
(
10
10
×
X2
P(n)
n = X1
]
PBW
1
×
(X2 - X1)
SPAN
)
P
T
= 10log [
∑
(
10
10
)
×
PBW
1
X2
P(n)
n = X1
]
×
1001
SPAN
