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ADJUSTMENTS
5.19.
LOG AMPLIFIER LOG AND LINEAR ADJUSTMENT (SERIAL PREFIX 2208A)
REFERENCE:
A14 and A15 Schematics
DESCRIPTION:
10
dB/DIV and LIN are adjusted for correct steps and full
-
screen display translations.
DISPLAY
DIGITAL
VOLTMETER
SIGNAL
GENERATOR
F
UTPUT
ATTENUATOR
FIGURE
53.
LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTTESTSETUP
EQUIPMENT:
.........................................................
Signal Generator HP 8640B
........................................................
Digital Voltmeter HP 3490A
....................
...............
Step Attenuator (10 dB/step)
r
HP 355D, Option H82
.................
Adapter,
Type
N Male on one end, BNC female on other end
HP 1250
-
0780
....................
Adapter, BNC Male on one end, SMA Male on other end HP 1250-0831
PROCEDURE:
1. Set spectrum analyzer controls
as
follows:
..................................................
FREQUENCY
BAND
GHz .01- 3
..........................................................
FREQ SPM/DIV 1 MHz
.......................................................
RESOLUTION BW 300 kHz
INPUTArnN
.............................................................
10dB
REFLEVELdBm
............................................................
-
50
..............................................................
Amplitude Scale LIN
........................................................
SWEEP TIME/DIV AUTO
.....................................................
SWEEP TRIGGER FREE RUN