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Performance Tests

CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual

4-97

H Press AUTOSET. You may see both positive and negative pulses.

Adjust the Trigger LEVEL knob so the trigger level is about 50% of

the rising edge of the positive pulse.

H From the button bar, touch the Horiz button and select the Acquisi-

tion tab. Press the RT buttontoturnonRealTimeOnly.

H Set the horizontal SCALE to 5 ns/division. The pulse width should

be about 6ns. The indicated sample rate should be 20 GS/s

H Set the vertical scale to 20 mV/div. Adjust the vertical Offset and

generator output level as necessary to obtain at least 6 divisions of

the positive pulse.

NOTE. If you have followed the procedure, you should have a 120 mV pulse

displayed on screen. Later in this procedure you will set the instrument to

measure the pulse width at the 75 mV level.

If the pulse you supply to the instrument is not a 120 mV pulse, you may need to

set the reference level (MidRef) to something other than 75 mV. Set the reference

level near the center of the pulse, above any noise, and below any overshoot or

ringing on the pulse.

d. Set up for statistics measurements:

H Press RUN/STOP button to freeze the display.

H From the Button bar, touch MEAS and select the Time tabtobring

up the Time Measurements menu.

H Touch the Positive Width button.

H Touch Setup Statistics. Touch the Measurement Statistics All button

and then touch Reset to reset the statistics.

H Touch Weight n=. On the keypad press 1000, then ENTER. Touch

Setup.

H Touch Setup Ref Levs and then touch Absolute.

H Touch MidRef. Using the keypad or multipurpose knobs, set the

mid reference to 75 mV and press Enter. Touch Close.

H Press the RUN/STOP button to start the acquisitions.

H Wait about 30 seconds.

H Press RUN/STOP button to freeze the display.

Record the all statistics values.

Tektronix CSA7404B Service Manual

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