Tektronix TDS7054, Service Manual

Page: 128 / 254

Performance Tests
4- 68
TDS7104 & TDS7054 Service Manual
H
Enter the time on the test record.
3. Confirm the trigger system is within time-accuracy limits for pulse-glitch or
pulse-width triggering (time range >520 ns
) :
a. Set upper and lower limits that ensure triggering at 250 kHz:
H
Touch
Upper Limit
. Use the keyboard to set the upper limit to 4 s.
H
Touch Lower Limit . Use the keypad to set the lower limit to 500 ns.
b. Display the test signal:
H
Set the Horizontal SCALE to 4 s.
H
Set the output of the sine wave generator for a 250 kHz,
five-division sine wave on screen. Set the Vertical
SCALE to 20 mV
(the waveform will overdrive the display).
H
Press
PUSH TO SET LEVEL 50%
.
c.
Check against limits:
Do the following subparts in the order listed.
H
Use the multipurpose knob to increase the Lower Limit readout
until triggering is lost.
H
CHECK that the
Lower Limit
readout, after the oscilloscope stops
triggering, is within 1.9 s to 2.1 s, inclusive.
H
Enter the time on the test record.
H
Use the keypad to return the Lower Limit to 500 ns and reestablish
triggering.
H
Touch Upper Limit ; then use the multipurpose knob to slowly
decrease the
Upper Limit
readout until triggering stops.
H
CHECK that the Upper Limit readout, after the oscilloscope loses
triggering, is within 1.9 s to 2.1 s, inclusive.
H
Enter the time on the test record.
4.
Disconnect the hookup:
Disconnect the cable from the generator output at
the input connector of CH 1 .