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Chapter 2 113
Performance Verification Tests
14. Reference Level Accuracy: Agilent E4401B and E4411B
Linear Scale, Analog Bandwidths
1. Set the 10 dB step attenuator to 20 dB attenuation.
2. Set the 1 dB step attenuator to 5 dB attenuation.
3. Set the analyzer by pressing the following keys:
AMPLITUDE, –25 dBm (50 Ω input only)
AMPLITUDE, 28.75 dBmV (75 Ω input only)
AMPLITUDE, Scale Type (Lin)
AMPLITUDE
, More, Y Axis Units (or Amptd Units), dBm
(50
Ω input only)
AMPLITUDE, More, Y Axis Units (or Amptd Units), dBmV
(75
Ω input only)
SPAN, 50 kHz
BW/Avg, 3 kHz
Video BW, 30 Hz
Sweep, Sweep Cont
Marker, Off
4. Set the 1 dB step attenuator to place the signal peak one to three
divisions below the reference level.
5. On the analyzer, press the following keys:
Single
Table 2-21 Log Mode, Digital Bandwidths Worksheet, Option 1DR
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
Level
a
(dBm) (dBmV)
Analyzer
Marker
Delta
Amplitude
(dB)
Test
Record
Entry
20 0 (Ref)
−25 28.75 0 (Ref) (Ref)
10
−15 38.75 8)
0
−5 48.75 9)
30
−35 18.75 10)
40
−45 8.75 11)
50
−55 −1.25 12)
60
−65 −11.25 13)
70
−75 −21.25 14)
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.