Performance Tests
TDS 500B, 600B and TDS 700A Service Manual
4–47
b. Set the trigger mode: Press TRIGGER MENU. Now press the
main-menu button Mode & Holdoff; then press the side-menu button
Normal.
c. Set upper and lower limits that ensure triggering: See Figure 4–15.
H Press the main-menu button Type; then repeatedly press the same
button until Pulse is highlighted in the menu that pops up.
H Press the main-menu button Class; then repeatedly press the same
button until Width is highlighted in the menu that pops up.
H Press the main-menu button Trig When; then press the side-menu
button Within Limits.
H Press the side-menu button Upper Limit. Use the keyboard to set
the upper limit to 10 ns: press 10, then SHIFT, then n, and ENTER.
H Press the side-menu button Lower Limit. Use the keypad to set the
lower limit to 2 ns.
d. Change limits until triggering stops:
H Press SET LEVEL TO 50%.
H While doing the following subparts, monitor the display (it will stop
acquiring) and the front-panel light TRIG (it will extinguish) to
determine when triggering is lost.
H Press the side-menu button Lower Limit.
H Use the general purpose knob to increase the Lower Limit readout
until triggering is lost.
H CHECK that the Lower Limit readout, after the oscilloscope loses
triggering, is within 3.5 ns to 6.5 ns, inclusive.
H Enter time on test record.
H Use the keypad to return the Lower Limit to 2 ns and reestablish
triggering.
H Press the side-menu button Upper Limit; then use the general
purpose knob to slowly decrease the Upper Limit readout until
triggering is lost.
H CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 3.5 ns to 6.5 ns, inclusive.
H Enter time on test record.
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