Chapter 2 145
Performance Verification Tests
19. Overall Absolute Amplitude Accuracy: Agilent E4401B and E4411B
8. Obtain the metrology data for the step attenuators at 50 MHz. Enter
the actual attenuation values for each attenuator setting as
indicated in Table 2-30. If using a programmable attenuator, the
section three 40 dB step should be used for the 40 dB setting on the
10 dB step attenuator. Similarly, the section three 4 dB step should
be used for the 4 dB setting on the 1 dB step attenuator.
9. Calculate the actual total attenuation by adding the actual
attenuation for the 1 dB step attenuator to the actual attenuation for
the 10 dB step attenuator for each total attenuation setting listed in
Table 2-30.
NOTE The external attenuators and cables are now part of the “source.”
10.Adjust the signal generator amplitude for a power meter reading of
0dBm
±0.2 dB. Record the power meter reading here:
Amptd0dBm = _______ dBm
11.Connect the equipment as indicated in Figure 2-22. The fixed
attenuator must connect directly to the analyzer input.
75 Ω Inputs: The minimum loss pad should be connected to the
analyzer input using a Type N (f) to BNC (m) 75 Ω adapter.
Table 2-30 Amplitude Accuracy Worksheet, 0 dBm Reference Level
1 dB Step
Attenuator
10 dB Step
Attenuator
Total
Attenuation
Nominal
Amptd.
Meas.
Amptd.
Amptd.
Accuracy
Test
Record
Entry
Setting Actual Setting Actual Setting Actual
0 dB 0 dB 0 dB 0 dBm 1)
0 dB 10 dB 10 dB –10 dBm 2)
0 dB 20 dB 20 dB –20 dBm 3)
0 dB 30 dB 30 dB –30 dBm 4)
0 dB 40 dB 40 dB –40 dBm 5)
0 dB 50 dB 50 dB –50 dBm 6)