Chapter 2 307
Performance Verification Tests
35. Displayed Average Noise Level: Agilent E4401B and E4411B
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.
Wait until VAvg 3 is displayed to the left of the graticule (the
analyzer will take three sweeps, then stop).
4. On the analyzer, press Peak Search (or Search). Then press:
BW/Avg, Average (Off)
Marker →, Mkr → CF
5. If the test RBW is 1 kHz or 100 Hz, press SPAN, 20 kHz.
If the test RBW is 10 Hz, press SPAN, 500 Hz.
6. 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, 100 Hz,
Video BW, 1 Hz.
If the test RBW is 10 Hz, press BW/Avg, Res BW, 10 Hz,
Video BW, 1 Hz.
7. On the analyzer, press Single and wait for the new sweep to finish.
8. 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).
Measuring Displayed Average Noise Level at 400 kHz
Non-Option 1DP (50 Ω input only)
1. If the test RBW is 10 Hz and the analyzer has Option 1DN (1.5 GHz
Tracking Generator) installed, press Source, Amplitude (Off).
2. Press FREQUENCY, Center Freq, 400 kHz. Set the analyzer by pressing
the following keys:
SPAN, 20 kHz (if test RBW = 1 kHz)
SPAN, 500 Hz (if test RBW = 10 Hz or 100 Hz)
AMPLITUDE, –70 dBm (50 Ω Input only)
Attenuation, 0 dB
AMPLITUDE, More, Ref Lvl Offst, (enter Ref Lvl Offset (1 kHz) if test
RBW = 1 kHz)