Performance Tests
4- 108
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
b. Hook up test-signal source 2: Connect the Aux Out to CH 2 through a
50 Ω precision cable and an adapter.
c. Initialize the instrument: Press the DEFAULT SETUP button.
d. Modify the initialized front-panel control settings:
H Press the Vertical CH 1 button to toggle it off.
H Press the Vertical CH 3 button to display that channel.
H Push Trigger Source to toggle the source to CH 3.
H Set the Horizontal SCALE to 200 s.
H If necessary, adjust the calibration generator output for 5 divisions of
amplitude.
H From the tool bar, touch Horiz and select the Acquisition tab.
H Touch Average and set the number of averages to 64.
H Touch the Close button.
2. Confirm AUX OUT is within limits for logic levels:
a. Display the test signal:
H Press the Vertical CH 3 buttontoturnoffCH3.
H Press the Vertical CH 2 button to display that channel.
H Set the Vertical SCAL E to 500 mV.
H Use the Vertical POSITION knob to center the display on screen.
b. Measur e logic levels:
H From the button bar, touch MEAS and select the Ampl tab.
H Touch the High and Low buttons.
H Touch the Close button.
c. Check AUX OUT output against limits: CHECK that the CH 2 High
readout is
≥1.0 volt and that the CH 2 Low readout ≤0.25 volts. See
Figure 4--30.
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