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PERFORMANCE TESTS
MODEL
8559A
PERFORMANCE
TESTS
4
-
26.
DISPLAY FIDELITY
(Cont'd)
TABLE
4
-
16.
AMPLITUDE LOG DISPLAY ACCURACY
Attenuator
Setting
(dB)
0
10
20
30
40
50
60
70
DVM
Reading
(mV)
I
*DVM
Reading minus
Corrected
DVM
Reading*
(mV)
+800
(Ref.)
offset recorded in step
2.
Theoretical
Reading
(mV)
Theoretical
Reading Subtracted
From Corrected
DVM Reading
(m V)
Difference
Between
Adjacent
Readings
(m V)
EXAMPLETABLE OF
4
-
16
Difference
Between
Adjacent
Readings
(mV)
Attenuator
Setting
(dB)
*DVM
Reading minus offset recorded in step
2.
8.
After recording DVM readings for step attenuator settings from 0 dB through 70 dB, calculate each
Corrected DVM Reading by algebraically subtracting offset recorded in step
2. Record results in Table
4
-
16 (see sample computations).
DVM
Reading
(mV)
9.
Algebraically subtract corresponding Theoretical Reading from each Corrected DVM Reading, recording
results in Table 4
-
16. Maximum value should not exceed
+
15 mV, corresponding to
+
1.5 dB. Divide
maximum value
by
10 to calculate Log Maximum Cumulative Error
(in
dB).
dB Log Maximum Cumulative Error
Corrected
DVM
Reading*
(mV)
Theoretical
Reading
(mV)
Theoretical
Reading Subtracted
From Corrected
DVM Reading
(mV)