Performance Tests
2-44
TDS5000B Series Specifications and Performance Verification
H Adjust the pulse amplitude and the vertical scale and position of the
instrument as necessary to obtain about 5 divisions of positive pulse
amplitude. Ensure that the positive pulse amplitude is greater than
200 mV.
d. Set up for statistics measurements:
H Readjust the Trigger LEVEL knob so that the trigger level is about
50% of the rising edge of the positive pulse. Note the voltage of the
trigger level—this voltage will be used in the following steps.
H Press RUN/STOP button to freeze the display.
H Click MEAS, and then select the Time tab to bring up the Time
Measurements menu.
H Click the Positive Width button.
H Click Setup Statistics. Click the Measurement Statistics All button,
andthenclickReset to reset the statistics.
H Click Weight n=. On the keypad press 1000 and ENTER; then click
Setup.
H Click Setup Ref Levs.
H Click Units Absolute.
H Set Mid Ref to the voltage of the trigger level noted previously in
this step. (This level is about 50% of the rising edge of the positive
pulse.)
H Click Setup, and then click Close.
H Press the RUN/STOP button to start the acquisitions.
H Wait approximately 30 seconds.
H Press the RUN/STOP button to freeze the display.
H Record all statistics values.
H Calculate the difference of the Maximum (M) minus the mean ().
H Calculate the difference of the mean () minus the Minimum (m).
H Both differences must be less than or equal to the Delta-time
accuracy limit shown in Table 2--4 for your oscilloscope.
H Enter the pass/fail result for delta time in the test record.
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