Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-31
b. Modify the initialized front-panel control settings:
H Do not adjust the vertical position of any channel during
this procedure.
H Set the horizontal SCALE to1ns.
H Press SHIFT;thenpressACQUIRE MENU.
H Press the main-menu button Mode, and then press the side-menu
button Average 16.
c. Hook up the test-signal source:
H Connect the sine wave output of a sine wave generator to a 50 Ω
precision coaxial cable, a 50 Ω termination, and a dual-input
coupler. (See Figure 4--8.)
H Connect the coupler to both CH 1 and CH 2. Ensure that the
coupler cables are of equal length.
Digitizing Oscilloscope
Sine Wave
Generator
Dual Input
Coupler
50 Ω Terminator
Output
Figure 4- 8: Initial Test Hookup
2. Confirm all channels are within limits for channel delay:
a. Set up the generator: Set the generator frequency to 250 MHz and the
amplitude for about five divisions in CH 1.
Hint: as you are adjusting the generator amplitude, push SET LEVEL
TO 50% frequently to speed up the updating of the waveform amplitude
on screen.
b. Save a CH 2 waveform: Press CH 2; then press save/recall WAVE -
FORM. Now, press the main-menu button Save Waveform;thenpress
the side-menu button To Ref 2.
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