Tektronix 070-8462-03, Instruction Manual

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Adjustment Procedure
6–12
1735 HD High Definition Waveform Monitor
11. Adjust Low-Frequency Input Compensation
a. Select CH 1A INPUT on the 1735 HD and terminate all six input
connectors in 75
W
.
b. Connect a Field-Rate Square Wave signal from the TSG 1001 to the
CH 1A INPUT.
c. Connect a X10 probe from A3TP3 on the 1735 HD to the test oscillo-
scope CH1 input.
d. Set the test oscilloscope as follows:
Volts/Div 100 mV
Coupling DC
Time/Div 1 ms
Trig TV Field
20 MHz BW Limit On
e. Adjust A3R447 (LFR 1A) and A3C139 (LFC 1A) for the best corner on
the leading edge of the square wave signal.
f. Repeat steps c. and e. for the remaining INPUT channels, as shown in
Table 6–3.
g. Remove the X10 probe and signal cable from the 1735 HD. Turn off the
20 MHz BW Limit on the test oscilloscope.
Table 6–3: Flat response adjustments
Input Test Point Adjustment
CH 1A A3TP3 A3R447 (LFR 1A)
A3C139 (LFC 1A)
CH 2A A3TP4 A3R432 (LFR 3A)
A3C126 (LFC 2A)
CH 3A A3TP5 A3R459 (LFR 3A)
A3C119 (LFC 3A)
CH 1B A3TP6 A3R440 (LFR 1B)
A3C103 (LFC 1B)
CH 2B A3TP7 A3R466 (LFR 2B)
A3C135 (LFC 2B)
CH 3B A3TP8 A3R468 (LFR 3B)
A3C13 7(LFC 3B)