Tektronix TDS7054, Service Manual

Page: 133 / 254

Performance Tests
TDS7104 & TDS7054 Service Manual
4- 73
H
Press the Trigger SOURCE button to toggle it to CH 1 .
4. Confirm that the trigger system is within sensitivity limits (full bandwidth):
a. Set the Horizontal Scale: Set the Horizontal SCALE to 500 ps.
b. Display the test signal:
H
Set the generator frequency to full bandwidth as follows:
TDS7104 1 GHz
TDS7054 500 MHz
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 500 mV. (Readout may fluctuate around
500 mV).
H
Disconnect the leveling head at CH 1 and reconnect it to CH 1
through a 5X attenuator. Check that a stable trigger is obtained.
c. Repeat step 2 , substeps b and c only, for the full bandwidth selected.
d.
Display the test signal:
H
Set the generator frequency to 100 MHz.
H
Set the Horizontal SCALE to 10 ns.
H
Remove the 5X attenuator and reconnect the cable to CH 1 .
H
Set the generator amplitude on screen as follows:
TDS7104 5 divisions
TDS7054 7.5 divisions
H
Now fine adjust the generator output until the CH 1 Amplitude
readout indicates the amplitude is as follows (Readout may
fluctuate):
TDS7104 500 mV
TDS7054 750 mV
e. Repeat step 3 , substeps b only, for the full bandwidth selected.
NOTE
. You just checked the trigger sensitivity. If desired, you may repeat steps
1
through
4c
for the other channels (CH 2, CH 3, and CH 4).
5. Disconnect the hookup: Disconnect the cables from AUX IN and from the
channel last tested.