HP ESA-L1500A, Руководство пользователя и калибровки

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224 Chapter 9
Performance Verification Tests
8. Scale Fidelity
Table 9-10 Linear Fidelity
Calculate Ideal Marker Amplitude
Considering Total Actual Attenuation at the 0 dB from Ref Level
setting to be ATref, and the Total Actual Attenuation at any other
dB from Ref Level setting to be ATmeas, calculate the Ideal Mkr
Reading, in millivolts, as follows and enter the result in column 7 of
Table 9-10 :
For example, if ATref = 0.012 dB and ATmeas = 7.982, the Ideal Mkr
Reading for the
−
8 dB from Ref Level setting would be:
Ideal Mkr Reading
dB
from
Ref
Level
1 dB step
atten
Nominal
Attenu-
ation
1 dB
step
atten
Actual
Attenu-
ation
10 dB
step
atten.
Nominal
Attenu-
ation
10 dB
step
atten.
Actual
Attenu-
ation
Total
Actual
Attenu-
ation
Ideal
Mkr
Reading
Actual
Mkr
Reading
TR
Entry
Linear
Fidelity
Error
dB dB dB dB dB dB mV mV % of RL
0 (Ref) 0 0 0 (Ref) 0 (Ref) 0 (Ref)
−
4 4 0 39
−
8 8 0 40
−
12 2 10 41
−
16 6 10 42
−
20 0 20
43
Ideal Mkr Reading (mv) 1000 SQRT 0.05 10
ATmeas – ATref +
( )
10
⁄ ( )
× [ ] ×
=
1000 SQRT 0.05 10
7.982 – 0.012 +
( )
10
⁄ ( )
× [ ] ×
=
1000 SQRT 0.05 10
7.97 10
⁄
–
( )
× [ ] ×
=
1000 SQRT 0.05 10
0.797 –
( )
× [ ] ×
=
1000 SQRT 0.05 0.15959
× [ ] ×
=
1000 SQRT 0.007979
[ ] ×
=
1000 0.0893
×
=
89.3mV =