Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4-87
H Set the sampling mode as follows:
TDS7704B: Touch the Interpolated Real Time IT button.
All other CSA/TDS7000B: Touch the Equivalent Time ET button.
H From the button bar, touch MEAS.
H Touch the Source Channel 1 button.
H Select the Ampl tab; then touch the Amplitude button.
H Touch Close.
H Set the Trigger SOURCE to CH 1.
H Press PUSH TO SET 50%.
c. Hook up the test-signal source:
H Connect, through a 50 Ω precision coaxial cable, a 2X attenuator,
and a TCA-BNC adapter, the output of the generator to CH 1 (see
Figure 4--19).
H Connect TCA-BNC adapters to the CH 2, CH 3, and CH 4 inputs.
H Connect 50 Ω terminations to the adapters on the CH 2, CH 3, and
CH 4 inputs.
2. Display the test signal:
H Set the generator to output a sine wave at the bandwidth of your
instrument or 1.5 GHz, whichever is less. 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 Remove the 2X attenuator.
3. Confirm the input channels are within limits for channel isolation:
a. Check — Amplitude of each trace other than CH 1 is 0.125 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 0.125 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.
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