Tektronix 070-8462-03, Instruction Manual

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Adjustment Procedure
1735 HD High Definition Waveform Monitor
6–19
h. Select FLAT Filter.
25. Adjust Noise Filter Response
a. Connect the output of the PG506A 0 to 1 V fast rise pulse, through a
50
W
cable and 50-to-75
W
minimum loss attenuator, to the CH 1A
INPUT on the 1735 HD.
b. Set the PG506A Period to 10
m
s.
c. Select CH 1A INPUT, MAG On, FILTER, and ONE LINE Sweep on the
1735 HD.
d. Adjust A3L3 and A3L5 for the best corner on the leading positive-going
pulse as viewed on the 1735 HD.
26. Adjust Diff Step Filter Response
a. Enter the 1735 HD MENU, select DIFF STEP FILTER, and exit the
MENU. Ensure that the front-panel FILTER LED is illuminated.
b. Adjust A3R139 (Diff Step Filter Gain) to midrange.
c. Adjust A3R567, A3L2, and A3L4 to null the ringing on the trailing edge
of the differentiated pulse.
d. Disconnect the PG506A from the 1735 HD.
27. Adjust Timing
a. Connect the TSG 1001 G/Y Output to the 1735 HD CH 1A INPUT.
Terminate the loop-through in 75
W
.
b. Set the TSG 1001 to the Zone Plate signal set, 525/59.94/2:1 Formats,
and press the Monitor Setup button.
c. Adjust the TSG 1001 sine wave frequency for 100 kHz
±
.0100 kHz.
d. Select CH 1A INPUT, CH 1 REF, FLAT Filter, and TWO LINE Sweep
on the 1735 HD.
e. Use the 1735 HD VERTICAL and HORIZONTAL Position controls as
needed to position the display so that the tips of the sine waves align
with major divisions on the graticule blanking level.
f. Adjust A3R158 (10
m
s Timing) for one cycle/division on the first line
display.
g. Check for one cycle/division on the second line of display, using the
HORIZONTAL Position control to line up the signal on the major
graticule divisions.
h. Select MAG on the 1735 HD.