HP ESA-L1500A, Руководство пользователя и калибровки

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228 Chapter 9
Performance Verification Tests
9. Input Attenuation Switching Uncertainty
3. For each total nominal attenuation setting indicated in Table 9-11 ,
calculate the total actual attenuation from the actual attenuation
columns for the 1 dB and the 10 dB step attenuators and enter the
result in
Table 9-11 . For example, if the actual 1 dB step attenuator
attenuation for the 5 dB setting is 5.021 dB and the actual 10 dB
step attenuator attenuation for the 30 dB setting is 29.981 dB, the
total actual attenuation for the 35 dB total nominal attenuation
settings would be:
4. Calculate the attenuation error by subtracting the difference
between the actual and nominal attenuations for each total nominal
attenuations from the difference between the actual and
nominal attenuations for the 50 dB total nominal attenuation:
Where:
Example:
Record the Attenuation Errors in Table 9-12 for the appropriate
Total Nominal Attenuation setting. Note that the Total Nominal
Attenuations listed in
Table 9-12 are in a different order than those
listed in Table 9-11 .
Total Actual Attenuation 5.021 dB 29.981 dB + 35.002 dB = =
AttenErr ActAtten 50 dB
( )
50 dB –
( )
ActAtten XdB
( )
NomAtten XdB
( )
–
( )
– =
AttenErr Attenuator Error between the X dB and 50 dB settings =
ActAtten(50 dB) Actual Attenuation of the 50 dB setting =
ActAtten(XdB) Actual Attenuation of the X dB setting =
NomAtten(XdB) Nominal Attenuation of the X dB setting =
ActAtten (50 dB) 50.15 dB =
ActAtten (35 dB) 35.002 dB =
NomAtten (35 dB) 35 dB =
AttenErr 50.15 50 –
( )
35.002 35 –
( )
– =
0.15 0.002 – =
0.148 dB =