Performance Tests
TDS 420A, TDS 430A & TDS 460A Service Manual
4-39
H Press the main-menu button Recall Factory Setup.
H Press the side-menu button OK Confirm Factory Init.
2. Confirm Main trigger system is within limits for Trigger-level/Threshold
accuracy:
a. Display the test signal:
H Set the vertical SCALE to 50 mV.
H Set the standard output of a DC calibration generator to +0.3 V.
b. Measure the test signal:
H Press SET LEVEL TO 50%.
H Press TRIGGER MENU.
H Read the measurement results from the readout below the label
Level in the menu rather than from the trigger readout in the
graticule area.
c. Check against limits:
H Subtract the trigger level readout from the DC calibration generator
setting. The result is the trigger level accuracy.
H CHECK that the trigger level is accurate to within ᐔ18 mV.
H Press TRIGGER MENU. Press the main-menu button Slope; then
press the side-menu button for negative slope. (See icon at left.)
Repeat substep b.
H Subtract the trigger level readout from the DC calibration generator
setting. The result is the trigger level accuracy.
H CHECK that the trigger level is accurate to within ᐔ18 mV.
3. Confirm Delayed trigger system is within limits for Trigger-level/Threshold
accuracy:
a. Select the Delayed time base:
H Press HORIZONTAL MENU.
H Press the main-menu button Time Base.
H Press the side-menu buttons Delayed Only and
Delayed Triggerable.
H Set D (delayed) horizontal SCALE to 500 s.
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