Tektronix WFM601, Service Manual

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Performance Verification
4–18
WFM 601 - Service Manual
c. Connect a precision 50 cable from the spectrum analyzer TG Output to
the RF Input on the RF Bridge.
d. Select Demod/TG on the spectrum analyzer. Turn on the Tracking
Generator and set the Tracking Generator Fixed Level to 0.00 dBm.
e. Set the spectrum analyzer Span/Div to 1 MHz and the Resolution
Bandwidth to 3 kHz.
f. Set the spectrum analyzer Reference Level to the first major division
down from the top on the analyzer display.
g. Set the Vertical Scale to 10 dB.
h. Remove one of the cables from the RF Bridge.
i. Set the spectrum analyzer Frequency Cursor to 5 MHz, and then set the
Marker to 6 MHz.
j. Reconnect the cable to the RF Bridge.
k. NOTE – the Reference Level Readout.
l. 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.
m. Connect the precision high-frequency terminator to the Device Under
Test connector on the RF Bridge.
n. CHECK – that the frequency response from 0 MHz to 6 MHz is
40 dBu.
o. Return the spectrum analyzer frequency marker to 6 MHz if it was
moved.
p. Remove the precision high-frequency terminator from the RF Bridge.
q. Connect the Device Under Test connector on the RF Bridge to one side
of the WFM 601 EXT REF loop through input. Terminate the remaining
side of the loop-through with the precision high-frequency terminator
used in step p.
r. CHECK – that the Reference Level Readout on the spectrum analyzer is
40 dBm.
20. Check Serial Video Return Loss
REQUIREMENT – Serial Video Inputs: 25 dB to 1 – 270 MHz. Power on.
Serial Video Inputs: 15 dB to 1 – 270 MHz. Power off. Serial Out: 15 dB
1 – 270 MHz. Power on.