Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-35
c. Modify the initialized front-panel control settings:
H Press VERTICAL MENU; then press the main-menu button
Coupling. Press the side-menu button Ω to change the coupling
setting to 50 Ω.
H If necessary, set the vertical SCALE to 100 mV per division.
H Set the horizontal SCALE of the Main time base to 2.0 ns.
H Using external attenuators if necessary, adjust the time standard
amplitude for a 5 to 7 division display.
H Rotate the vertical POSITION control to center the
displayed waveform.
2. Confirm Main and Delayed time bases are within limits for accuracies:
a. Check delta-time accuracy against limits:
H Press SET LEVEL TO 50%.
H Press SHIFT; then ACQUIRE MENU. Now press the main-menu
button Mode; then press the side-menu button Average.
H Use the General Purpose knob to set the number of averages to 8.
H Press MEASURE.
H Press the main-menu button High-Low Setup; then press the
side-menu button Min-Max.
H Press the main-menu button Select Measurement for Ch1.
H Press the side-menu button -- m o r e -- , until PERIOD appears in the
side menu. Press PERIOD.
H Press CLEAR MENU.
H CHECK that the readout for CH 1 Per is within 9.7 ns to 10. 3 ns.
b. Check long-term sample rate and delay time accuracies against limits:
H Press SHIFT; then ACQUIRE MENU. Now press the main-menu
button Mode; then press the side-menu button Sample.
H Press MEASURE.
H Press the main-menu button Remove Measurement; then press the
side-menu button Measurement 1.
H Set the horizontal SCALE of the Main time base to 100 ns.
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