USB-5680 NI [National Instruments Corporation], USB-5680 Datasheet - Page 3

• Manufacturer Part Number: USB-5680
• Description: True RMS power measurements/Diode power meter
• Manufacturer: NI [National Instruments Corporation]

6 GHz True RMS Power Meter with Bus-Powered USB Connectivity
Averaging and Noise Level
Because noise can have a significant effect on the accuracy of RMS
power measurements, settings such as aperture time and averaging are
often employed to mitigate the effects of noise on measurement accuracy.
settings to offer both high-speed and high-accuracy options. In
“Low-Aperture” mode, the power meter features 15 measurements
per second and in “High-Aperture” mode, the USB-5680 features
1 measurement per second. With these two options, you can choose the
aperture mode and, number of averages to obtain the desired noise level
of measurement. Table 2 shows the number of averages required in both
aperture modes to achieve less than ±0.10 and ±0.01 dB noise levels.
High-Aperture Mode
Table 2. Number of Averages, High-Aperture Time Mode
To improve flexibility, the USB-5680 features two aperture time
Input Power
(dBm)
-10
-15
-20
-25
-30
-35
-40
>0
-5
Input Power
0.000100
0.00100
0.00032
0.0100
0.0032
(mW)
>1.00
0.100
0.032
0.32
for <±0.10 dB Noise
Averages Needed
Number of
39
1
1
1
1
1
1
1
4
for <±0.10 dB Noise
Averages Needed
Number of
—
—
38
1
5
1
1
1
4
Low-Aperture Mode
Table 3. Number of Averages, Low-Aperture Time Mode
Ordering Information
NI USB-5680 ..........................................................................780167-01
Includes NI-568x driver featuring soft front panel and API for LabVIEW,
LabWindows/CVI, C, C++, and .NET.
BUY NOW!
For complete product specifications, pricing, and accessory
information, call 800 813 3693 (U.S.) or go to ni.com/rf.
Input Power
(dBm)
>10
-10
-15
-20
-25
-30
-35
-40
-5
5
0
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
Input Power
0.000100
0.00032
0.0032
0.0010
(mW)
>10.0
0.032
0.010
0.32
0.10
3.2
1.0
for <±0.10 dB Noise
Averages Needed
Number of
—
62
1
1
1
1
1
1
1
1
7
for <±0.10 dB Noise
Averages Needed
Number of
16
78
61
—
—
—
1
2
1
1
7
3