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Proper operation of the Log Offsets, Oslo, OS20-1, and OS20-2 can de determined from the
display.
Connect an HP 355D Step Attenuator between CAL OUTPUT and the input of the spectrum
analyzer. Set this attenuator to 100 dB. Press Instrument Preset and key in the following
settings:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Hz
( S W E E P ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 s
(
R E F E R E N C E
Press the (SINGLE) sweep key. Then press the DATA STEP (IJ key repeatedly. A display
similar to Figure 1 should result. If a step is missing, one of the offsets or its control circuitry
is defective. The truth table in Note 5 is an aid to determine which offset circuit is not
operating properly. 0 V in the table indicates that an offset is active. Accurate determination
of amplitude step size is attainable using the MARKER @ key and the DATA knob.
R E F - 1 1 0 . 0 dBm ATTEN 0 dB
1 0 dB/
- 4 0
C E N T E R 2 0 . 0 0 0 0 0 0 M H z
N O T E : C
e n t e r F r e q u e n c y r e a d o u t w i l l b e 1 0 0 . 0 0 0 0 0 0 M H z
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..-4O dBm
R E F -ML]
- 1 1 0 . 0 dB
I
I
I
I
R E S BW 3 kHz
VBW 10 Hz
Figure 1. Log Offset Gain Step Display
equal to CAL OUTPUT frequency
I
I
I
I
I
S P A N 0 H z
0 Hz
f o r a n H P 8 5 6 6 8
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