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Checks and Adjustments
5-16
1705A Spectrum Monitor
a. Set the UHF signal generator Frequency to 1400 MHz, and Amplitude to
--60 dBm.
b. CHECK -- that the tip can be positioned 2 Divisions left and right of
center.
c. Set the UHF signal generator Amplitude to --30 dBm.
d. Position baseline on the --60 graticule reference line.
e. CHECK -- that the marker tip can be positioned 3 Divisions down from
its present position.
f. CHECK -- that the baseline can be positioned to the --30 graticule line.
14. Check 2 dB/DIV Gain
REQUIREMENT -- Greater than 1 Division of amplitude change while
changing from --50 dBm to --53 dBm.
a. Set the UHF signal generator Frequency to 1400 MHz, and Amplitude to
--50 dBm.
b. Hold the VIDEO push button until 2 dB/Div appears on the crt readout.
c. Use the CENTER FREQUENCY control to locate the 1400 MHz
marker.
d. Select 100 kHz SPAN/DIV. Using CENTER FREQUENCY and
VERTICAL controls, check that the marker tip can be positioned on
screen.
e. Return to FULL SPAN.
f. Turn the 1705A SWEEP SPEED control fully counterclockwise.
g. CHECK -- for more than 1 Division of amplitude change while
switching the frequency generator between --50 dBm and --53 dBm.
h. CHECK -- that the noise floor can be positioned on screen.
i. Hold the VIDEO push button down again to exit the 2 dB/Div mode.
End of the Performance Check Procedure