Table of Contents
Advertisement
Displayed Average Noise Level (DANL) Description
16. Calculate the deviation by taking the di erence between the
measured test set gain (recorded in step 14) and the factory test
set gain correction factor (recorded in step 15c). Record the
deviation in Table 3-5.
17. The deviation should be
18. Repeat the above procedure, starting at step 5 for each test
frequency and hardware con guration.
Table 3-5. Test Set Veri cation
1
Con guration
Test Set
Band
Frequencies
(GHz)
(GHz)
1 to 18
1
1 to 18
18
1.5 to 18
1.5
1.5 to 18
18
3.5 to 18
3.5
3.5 to 18
18
8.25 to 18
8.25
8.25 to 18
18
18 to 26.5
18
18 to 26.5
26.5
26.5 to 40
26.5
26.5 to 40
40
1
The test frequencies listed are for convenience purposes. Any frequency from
1 to 40 GHz can be tested. However, you must ensure that the proper correction
factors are used to calculate the deviation. Refer to Table 3-4.
This test measures the displayed average noise level of the HP 84125C
microwave EMI measurement test system.
The test set is connected to the input of the spectrum analyzer. The
DLP is used to set up the initial spectrum analyzer settings and to
load the correction factors for the complete test set. This includes the
correction factors for the antenna (that is, the antenna factors) and
correction factors for the ampli ers, cables, and lters.
The DANL test is performed in two parts:
Part 1, 1 to 18 GHz
Video averaging is activated and the displayed average noise level is
measured in zero span at the selected frequency points. The antenna
correction factor at the test frequency must be used to calculate the
actual displayed average noise level. The antenna is not used for this
test and is substituted by a 50 ohm termination.
6
3.5 dB.
Synthesizer
Marker
Measured
Output
Amplitude
Test Set
Level
Gain
(dBm)
(dB)
System Setup and Functional Tests 3-15
Factory
Deviation
Test Set
Gain
(dB)
(dB)
(dB)
Limits
(dB)
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
6
3.5
Advertisement
Table of Contents
