RF ATTEN to 10dB. Remove the
I RF INPUT and apply the microwave
las snown in Fig. 3-8. Change to band 4
and switch the FREQ SPAN/DIV to
\492P has Option 01, adjust the
|aximum marker amplitude. It may be
|just the FREQUENCY for best marker
ker to center screen then check the accu-
pht divisions of the display. Deviation
Hz/div.
h. Remove the comb generator from the RF INPUT and
connect the Marker Output of the time mark generator to
the RF INPUT. Set the FREQ SPAN/DIV to 50 MHz, and
apply 20 ns time markers to the 492/492P input.
Calibration—492/492P Service Vol. 1 (SN B030000 & up)
Performance Check
i. Tune toward the lower frequency end of the band until
50 MHz markers are displayed over the center eight divi
sions (10 MHz markers will appear between each 50 MHz
marker).
Check the accuracy of the 50 MHz/div span.
and 10 GHz SPAN/DIV selections
cannot be checked; however, their
Itly related to the 100 MHz and 200 MHz
k. Reduce the FREQ SPAN/DIV to 20 MHz and apply
50 ns (20 MHz) markers. Check the span/div accuracy.
FREQUENCY RANGE to band 1
JGHz Option 01). Re-establish a REF
and tune the FREQUENCY to
'SPAN/DIV to 50 MHz and select a
WDWIDTH of 1 MHz.
I. Change the RESOLUTION BANDWIDTH to 10 kHz,
then repeat this procedure to check the FREQ SPAN/DIV
accuracy from 10 MHz down to 1 MHz, using Table 3-6 as a
guide to relate time markers to frequency span/div settings.
503 Main Frame
492 Spectrum Analyzer
O o o
RF In
Comb Generator Module
Fig. 3-8. Test equipment setup for checking span and timing accuracy.
3-21
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