Tektronix WFM601, Руководство по обслуживанию

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Performance Verification
WFM 601 - Service Manual
4–19
a. Remove the lower frequency RF Bridge and replace it with the higher
frequency bridge. Reconnect the cables.
b. Set the spectrum analyzer Span/Div to 50 MHz and the Resolution
Bandwidth to 300 kHz.
c. Set the spectrum analyzer Reference Level to the first major division
down from the top on the analyzer display.
d. Remove one of the cables from the RF Bridge.
e. Set the spectrum analyzer Frequency Cursor to 250 MHz, and then set
the Marker to 270 MHz.
f. Reconnect the cable to the RF Bridge.
g. NOTE – the Reference Level Readout.
h. Adjust the spectrum analyzer External Attenuation Amplitude by the
amount noted in the previous step. Note: The Reference Level Readout
should now be 0.00 dBm.
i. Connect the precision high-frequency terminator to the Device Under
Test connector on the RF Bridge.
j. CHECK – that the frequency response from 0 MHz to 270 MHz is
25 dBm.
k. Return the spectrum analyzer frequency marker to 270 MHz if it was
moved.
l. Remove the precision high-frequency terminator from the RF Bridge.
m. Connect the Device Under Test connector on the RF Bridge to one side
of the WFM 601 SER A loop-through input. Terminate the remaining
side of the loop through with the precision high-frequency terminator
used in step l.
n. CHECK – that the Reference Level Readout on the spectrum analyzer is
25 dBm.
o. Turn WFM 601 POWER to STANDBY.
p. CHECK – that the Reference Level Readout on the spectrum analyzer is
15 dBm.
q. Turn WFM 601 POWER ON.
r. Connect the Device Under Test connector on the RF Bridge to one side
of the WFM
601 SER B loop through-input. Terminate the remaining
side of the loop through with the precision high-frequency terminator
used in step l.