Tektronix 070-8462-03, Instruction Manual

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Adjustment Procedure
6–14
1735 HD High Definition Waveform Monitor
14. Adjust Overdrive Recovery
a. Connect the trigger output from the PG506A to the EXT REF Input on
the 1735 HD.
b. Turn the 1735 HD OFF and unsolder one end of A3W2. Turn the
1735 HD back ON.
c. Connect the 0 to 1 V Fast Rise Pulse, through a 50
W
cable adapter
(described in the equipment list in the front of this section), to pin 1 of
A3J25.
d. Select the 1735 HD MAG On, EXT REF, and ONE LINE Sweep.
e. Set the PG506A controls to: Fast Rise, Period .1ms, Variable Amp Max.
f. Use the Variable on the Time Period to position the positive-going edge
of the pulse at center screen on the 1735 HD.
g. Adjust A3R145, A3L9, and A3L8 for best corner on the leading edge of
the square wave as viewed on the 1735 HD.
h. Remove the cable from A3J25. Turn OFF the 1735 HD, resolder A3W2,
and turn the 1735 HD ON.
i. Remove all cables and terminators from the 1735 HD.
15. Adjust X1 Flat Gain
a. Connect the VAC to the CH 1A INPUT on the 1735 HD. Do not
terminate the loop-through. Set the VAC for a 999.9 mV signal output.
b. Select CH 1A INPUT, CH 1 REF, FLAT Filter, Gain Off, and TWO
LINE Sweep on the 1735 HD.
c. Adjust the front-panel VERTICAL Cal screwdriver adjustment for a 1 V
signal.
d. Move the VAC signal to the CH 2A INPUT and select CH 2 INPUT on
the front panel.
e. Check for a 1 V display on the 1735 HD.
f. Repeat steps d. and e. for the remaining INPUT channels (CH 3A, CH
1B, CH 2B, and CH 3B).
16. Adjust X5 Gain
a. Set the VAC Amplitude to 200.0 mV.
b. Select X5 Gain on the 1735 HD.
c. Adjust A3R128 (X5 Gain) for a 1 V display.