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MODEL 8559A PERFORMANCE TESTS
PERFORMANCE
TESTS
4
-
26.
DISPLAY FIDELITY
(Cont'd)
Algebraically subtract each converted reading (Theoretical Reading Subtracted from Corrected DVM
Reading) from previous converted reading. Record results in Table 4-16 (see sample computations). Maxi
-
mum difference between adjacent readings should not exceed
+
10 mV, corresponding to
f
1 dB/10 dB or
+
0.1 dB/dB. Divide maximum value by 100 to calculate Log Incremental Error (in dB/dB).
dB/dB Log Incremental Error
Replace 10
-
dB step attenuator with 1
-
dB step attenuator. Set step attenuator to 0 dB.
Set spectrum analyzer Amplitude Scale to LIN and adjust TUNING control for maximum reading on
DVM.
Adjust signal generator OUTPUT LEVEL for DVM reading of 800
mV
+
offset (step 2)
+
0.5 mV. Trace
should be approximately at top CRT graticule line.
Record DVM reading for step attenuator settings of 6 dB and 12 dB in Table 4
-
17.
Calculate each Corrected DVM Reading by algebraically subtracting offset recorded in step 2. Record
results in Table
4
-
17.
Algebraically subtract corresponding Theoretical Reading from each Corrected DVM Reading, recording
results in Table 4
-
17. Maximum value should not exceed
+24
mV, corresponding to
+
3%
of 800 mV
Reference Level. Divide maximum value by 8 to calculate Percent Linear Error.
%
of Reference Level Linear Error
I
*DVM
Reading minus offset recorded in step
2.
TABLE
4
-
17.
AMPLITUDE LINEAR DISPLAY ACCURACY
Theoretical
Reading Subtracted
From Corrected
DVM Reading
(mV)
0
Attenuator
Setting
(dB)
0
6
12
DVM
Reading
(mV)
DVM
Reading*
(mV)
+800
(Ref.)
Theoretical
Reading
(mV)
+800
+401
+201