314 Chapter 2
Performance Verification Tests
36. Displayed Average Noise Level: Agilent E4402B and E4403B
continue with “Remove Reference Level Offset”.
Measuring Displayed Average Noise Level (DANL)
Use the following procedure for testing DANL over most frequency
ranges. The start and stop frequencies and test RBW (1 kHz, 100 Hz or
10 Hz) are specified in the DANL Measurement Sequence Table (Table
2-85 or Table 2-86).
1. If the test RBW is 100 Hz or 10 Hz and the analyzer has Option 1DN
(1.5 GHz Tracking Generator) installed, press Source, Amplitude
(Off).
2. Set the analyzer as follows:
Auto Couple
FREQUENCY, Start Freq, (enter specified start frequency)
FREQUENCY, Stop Freq, (enter specified stop frequency)
AMPLITUDE, –70 dBm
Attenuation, 0 dB
AMPLITUDE, More, Ref Lvl Offst, (enter Ref Lvl Offset (1 kHz) if test
RBW = 1 kHz)
AMPLITUDE, More, Ref Lvl Offst, (enter Ref Lvl Offset
(100 Hz/10 Hz) if test RBW = 100 Hz or 10 Hz)
BW/Avg, Res BW, 1 MHz
BW/Avg, Video BW, 10 kHz
AMPLITUDE, More, Int Preamp (Off) (if preamp state = Off)
AMPLITUDE, More, Int Preamp (On) (if preamp state = On)
Sweep, Sweep (Cont)
Sweep, Sweep Time (Auto)
3. On the analyzer, press Single, View/Trace, Trace 1,
Clear Write, BW/Avg, Average Type (Video), Average, 3, Enter, Single
4. Wait until VAvg 3 is displayed to the left of the graticule (the
analyzer will take three sweeps, then stop).
5. On the analyzer, press the following keys:
BW/Avg, Average (Off)
Peak Search (or Search)
BW/Avg, Average (On)
Marker→ , Mkr→ CF
6. If the test RBW is 1 kHz, press SPAN, 20 kHz.
If the test RBW is 100 Hz or 10 Hz, press SPAN, 500 Hz.
7. If the test RBW is 1 kHz, press BW/Avg, Res BW, 1 kHz,
Video BW, 30 Hz.
If the test RBW is 100 Hz, press BW/Avg, Res BW, 100 Hz, Video BW, 10
Hz.
If the test RBW is 10 Hz, press BW/Avg, Res BW, 10 Hz,