■
Touch Weight n=. On the keypad press 1000, then Enter. Touch
Setup.
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Touch Setups Ref Levs and then touch Absolute.
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Touch MidRef. Using the keypad or multipurpose knobs, set the mid
reference level. Set the reference level near the center of the upper
portion of the pulse, above any noise, and below any overshoot or
ringing on the pulse. Touch the X (Close) button.
■
Press the Run/Stop button to start the acquisitions.
■
Wait about 30 seconds.
■
Press Run/Stop button to freeze the display.
■
Read the Std Dev statistic measurement.
■
The standard deviation (St Dev) measurement must be less than or
equal to the Delta-time accuracy limit for your instrument. (See
Table 16: Delta time measurement settings on page 247.)
■
Enter the result for delta time on the test record.
e. Repeat for all other channels:
■
Note the vertical scale setting of the channel just confirmed.
■
Press the Vertical channel button for the channel just confirmed to
remove the channel from display.
■
Touch Measure and then Clear All to remove the measurement.
■
Press the front-panel button that corresponds to the channel you are
to confirm.
■
Set vertical scale to the setting noted in step STEP-22, first bullet.
■
Press the Trigger Source button to toggle the source to the channel
selected.
■
<4 GHz models: Touch Vertical, select Vertical Setup, and then
touch Termination 50 Ω.
■
Move the test hookup to the channel you selected.
■
Press Run/Stop button to start the display.
■
Repeat step 1.d.
■
Touch Utilities, select User Preferences, select the Units tab, and
then select the 1-2-3 button.
2. Disconnect all test equipment from the instrument.
Performance verification (MSO/DPO70000C, MSO/DPO70000DX, and DPO7000C series)
248 MSO70000C/DX, DPO70000C/DX, DPO7000C, MSO5000/B, DPO5000/B Series