Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4-89
H Move the signal to the CH 1 input, change the Trigger Source to
CH 1, and move the 50 Ω termination to the CH 4 input.
H Press PUSH TO SET 50%.
H SettheVerticalSCALEofCH1,CH2,CH3,andCH4to100 mV.
H Set the Horizontal SCALE to display 2 to 5 cycles of the signal.
H Set the generator to output a sine wave at the bandwidth of your
instrument. Set the test signal amplitude for about five divisions on
screen. Now fine adjust the generator output until the CH 1
Amplitude readout indicates the amplitude is 500 mV. Readout may
fluctuate around 500 mV.
H Set the trigger as follows:
TDS7704B: Touch the Source Line button.
All other CSA/TDS7000B: Press the front-panel PUSH TO SET
50% as necessary to trigger a stable display. At full bandwidth, you
may also want to make small, manual adjustments to the trigger
level. You can use the Trigger LEVEL knob to do this.
H Remove the 2X attenuator.
5. Confirm the input channels are within limits for channel isolation:
a. Check — Amplitude of each trace other than CH 1 is 0.67 division or
less (discount trace width). Enter the largest amplitude on the test record.
b. Move the signal to the CH 2 input connector, change the Trigger
SOURCE to CH 2, and move the 50 Ω termination to the CH 1 input.
c. Check — Amplitude of each trace other than CH 2 is 0.67 division or
less (discount trace width). Enter the largest amplitude on the test record.
d. Move the signal to the CH 3 input connector, change the Trigger
SOURCE to CH 3, and move the 50 Ω termination to the CH 2 input.
e. Check — Amplitude of each trace other than CH 3 is 0.67 division or
less (discount trace width). Enter the largest amplitude on the test record.
f. Move the signal to the CH 4 input connector, change the Trigger
SOURCE to CH 4, and move the 50 Ω termination to the CH 3 input.
g. Check — Amplitude of each trace other than CH 4 is 0.67 division or
less (discount trace width). Enter the largest amplitude on the test record.
h. Select an unchecked Vertical SCALE:
H Connect the 2X attenuator to CH 1.
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