Performance Tests
4-88
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
e. Check — Amplitude of each trace other than CH 3 is 0.125 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 0.125 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 the CH 1 input.
H Move the signal to the CH1 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,andCH4to50 mV
H 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 250 mV. Readout may fluctuate around
250 mV.
H Remove the 2X attenuator.
H Repeat substeps a through g.
H Connect the 2X attenuator to CH 1.
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,andCH4to10 mV
H 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 50 mV. Readout may fluctuate around
50 mV.
H Remove the 2X attenuator.
H Repeat substeps a through g.
4. Display the test signal: If your instrument bandwidth is ≤1.5 GHz, skip to
step 6.
H Connect the 2X attenuator to CH 1.
To Next Page
Loading...
