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Performance Tests

4-32

TDS 420A, TDS 430A & TDS 460A Service Manual

c. If you are testing a TDS 430A, skip to step h.

d. Save a CH 3 waveform: Move the coupler from CH 2 to CH 3, so that

CH 1 and CH 3 are driven. Press CH 3; then press the side-menu button

To Ref 3.

e. Display all test signals:

H Press WAVEFORM OFF twice to remove CH 2 and CH 3 from

the display.

H Move the coupler from CH 3 to CH 4,sothatCH1andCH4are

driven. Press CH 4 to display.

H Now, press the front-panel button MORE. Press the main-menu

buttons Ref 2 and Ref 3.

f. Measure the test signal:

H Locate the point on the rising edge of the left-most waveform where

it crosses the center horizontal graticule line. This is the time

reference point for this waveform. Note the corresponding time

reference point for the right-most waveform. See Figure 4--9.

H Press CURSOR; then press the side-menu button V Bars.

H Press CLEAR MENU.

H Rotate the General Purpose knob to align one cursor to the time

reference point of the left-most waveform edge and the other cursor

to the time refer ence point of the right-most waveform edge. (P ress

SELECT to switch between the two cursors.) See Figure 4--9.

H Read the measurement results at the ∆: cursor readout, not the @:

readout on screen.

g. Check all channels against limit: CHECK that the cursor readout on

screen is ≤450 ps. If the cursor readout is ≤200 ps, skip substep h.

Tektronix TDS 420A Service Manual

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