Chapter 2 111
Performance Verification Tests
14. Reference Level Accuracy: Agilent E4401B and E4411B
Log Scale, Digital Bandwidths, Option 1DR
NOTE If the analyzer is an E4401B that is not equipped with Option 1DR
(narrow resolution bandwidths) or an E4411B (with or without Option
1DR), skip to the next section (Linear Scale, Analog Bandwidths).
1. On the analyzer, press the following keys:
SPAN, 150 Hz
BW/Avg, 10 Hz
Video BW, 1 Hz
2. Set the 1 dB step attenuator to place the signal peak 1 to 3 dB (1 to 3
divisions) below the reference level.
3. On the analyzer, press the following keys:
Single
Peak Search (or Search)
Marker, Delta
4. Set the 10 dB step attenuator and analyzer reference level according
to Column 1 and Column 4 of Table 2-21. At each setting, do the
following:
Table 2-20 Log Scale, Analog Bandwidths
Column 1 Column 2 Column 3 Column 4 Column 5 Column 6
10 dB
Attenuator
Nominal
Attenuation
(dB)
10 dB
Attenuator
Actual
Attenuation
(dB)
Actual
Attenuator
Step
(dB)
Analyzer
Reference
Levela
(dBm)
(dBmV)
Analyzer
Marker
Delta
Amplitude
(dB)
Test
Record
Entry
20 0 (Ref) −25 28.75 0 (Ref) (Ref)
10 −15 38.75 1)
0−5 48.75 2)
30 −35 18.75 3)
40 −45 8.75 4)
50 −55 −1.25 5)
60 −65 −11.25 6)
70 −75 −21.25 7)
a. Use the dBm column values for analyzers with a 50 Ω input and the dBmV col-
umn for
analyzers with a 75 Ω input.