Chapter 2 329
Performance Verification Tests
38. Displayed Average Noise Level: Agilent E4407B and E4408B
RBW = 1 kHz)
AMPLITUDE, More, Ref Lvl Offst, (enter Ref Lvl Offset (100 Hz/10
Hz) if test RBW = 10 Hz or 100 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. If the analyzer is equipped with Option 1DN and the current stop
frequency is >3 GHz, press Source, Amplitude (Off).
4. On the analyzer, press Single, View/Trace, Trace 1, Clear Write, BW/Avg,
Average Type (Video), Average, 3, Enter, Single.
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:
Peak Search (or Search)
BW/Avg, Average (Off)
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,
Video BW, 1 Hz.
8. On the analyzer, press Single and wait for the new sweep to finish.
9. Read the average of the trace data, ignoring any residual responses.
On the analyzer, press Display, Display Line (On), and adjust the
display line so that it is centered on the average trace noise, ignoring
any residual responses (refer to the Residual Responses verification
test for any suspect residuals).
Remove Reference Level Offset
10.Press AMPLITUDE, More, Ref Lvl Offst, 0 dB.
11.On the analyzer, press Preset.
12.This performance test is now complete.