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PERFORMANCE TESTS
MODEL
8559A
PERFORMANCE TESTS
,
4
-
26. DISPLAY FIDELITY
SPECIFICATION:
Log Incremental Accuracy:
f
0.1 dB per dB from Reference Level
Log Maximum Cumulative Error:
<
+_
1.5 dB over entire 70
-
dB range
Linear Accuracy;
t-
3% of Reference Level
DESCRIPTION:
The amplitude of the log display amplifier is tested by connecting a DVM to the display (AUX A) VERTICAL
OUTPUT connector. A wide resolution bandwidth setting is selected so the signal appears as a straight horizon
-
tal line on the CRT The DVM is used to provide good resolution when checking for
+
1 dB per 10 dB step (0.1
dB/dB).
SIONAL GENERATOR
DIOITAL VOLTMETER
SPECTRL
ADAPTER
1
STEP
ATTENUATOR ADAPTER
A
-
FIGURE
4-22.
DISPLAY FIDELITY TEST SETUP
EQUIPMENT
SignalGenerator
.........................................................
HP8640B
Digitalvoltmeter
........................................................
HP3556A
......................................
Step Attenuator (10 dB/step)
HP 355D, Opt. H82
Adapter, Type N (m) to BNC
(f)
(2 required)
...............................
HP 1250
-
0780
..............................................
Cable, BNC to Banana Plug
HP 1 1001 A
PROCEDURE:
Log Display Accuracy
1.
Set equipment controls as follows:
Spectrum Analyzer:
FREQUENCYBANDGHz
..................................................
.01-3
TUNING
..............................................................
0.030GHz