Tektronix TDS6404, Service Manual

Page: 109 / 252

Performance Tests
TDS6000 Series Service Manual
4- 53
H
Set the Horizontal SCALE to 2 to 5 cycles of the signal.
H
Set the generator output at a sine wave of 4 GHz bandwidth to check
your oscilloscope. 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.
5. Confirm the input channels are within limits for channel isolation:
a.
Check — Amplitude of each trace other than CH 1 is 0.5 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
terminator to the CH 1 input.
c. Check — Amplitude of each trace other than CH 2 is 0.5 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
terminator to the CH 2 input.
e. Check — Amplitude of each trace other than CH 3 is 0.5 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
terminator to the CH 3 input.
g.
Check — Amplitude of each trace other than CH 4 is 0.5 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.
H
Move the signal to CH 1, set the Trigger SOURCE to CH 1, and
move the 50
Ω
terminator to the CH 4 input.
H
Press PUSH TO SET 50% .
H
Set the Vertical SCALE of CH 1, CH 2, CH 3, and CH 4 to
50 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 steps a through g.