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322 Chapter 2
Performance Verification Tests
37. Displayed Average Noise Level: Agilent E4404B and E4405B
RBW = 1 kHz)
AMPLITUDE, More, Ref Lvl Offst, (enter Ref Lvl Offset (10 Hz) if test
RBW = 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. 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→, Μκρ→ ΧΦ
6. If the test RBW is 1 kHz, press SPAN, 20 kHz.
If the test RBW is 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 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
1. Press
AMPLITUDE, More, Ref Lvl Offst, 0 dB.
2. On the analyzer, press
Preset.
3. This performance test is now complete.