Performance Tests
TDS 684A, TDS 744A, & TDS 784A Service Manual 4–43
HSet the horizontal SCALE of the Main time base to 1 ms.
HPress TRIGGER MENU; then press the main-menu button Mode
& Holdoff. Press the side-menu button Normal.
2. Confirm Main and Delayed time bases are within limits for accuracies:
a. Display the test signal:
HAlign the trigger T to the center vertical graticule line by adjusting
the horizontal POSITION. See Figure 4–12 on page 4–44.
HPress HORIZONTAL MENU.
HSet horizontal modes. To do this, press the main-menu button Time
Base. Press the side-menu buttons Delayed Only and Delayed Runs
After Main. See Figure 4–12.
b. Measure the test signal:
HSet the horizontal SCALE of the D (delayed) time base to 500 ns for
the TDS 684A or to 100 ns for the TDS 7XXA.
HSet delayed time to 10 ms. Do this on the keypad by pressing 10,
then SHIFT, then m followed by ENTER.)
c. Check long-term sample rate and delay time accuracies against limits:
H CHECK that the rising edge of the marker crosses the center
horizontal graticule line at a point within either ±2.0, for the TDS
684A, or ±2.5, for the TDS 7XXA, divisions of center graticule. See
Figure 4–12.
HEnter number of divisions on test record.