Tektronix 2445A Service Manual page 110

Performance Check-2445A/2455A Service
9. Verify Trigger Delta Delay.
a. Connect the leveled sine-wave generator's output via
a 50-n cable to the CH 1 input connector. Set the A
SEC/DIV to 10
µS.
Set the Horizontal POSITION to
midrange.
b. Set the generator for a 50-kHz, 6-division display.
c. Push the TRIGGER SLOPE button to illuminate the
+
SLOPE indicator.
d. Push the A/B MENU button to enter MENU mode.
e. Turn either~ control to underline
COUNT.
f. Push the upper TRIGGER MODE button.
g. If the instrument contains Option 09 (Word Recog-
nizer), turn the
~
REF OR DL Y POS control to underline
MODE.
h. Turn the~ control to underline
PERIOD.
i. If the instrument contains Option 09 (Word Recog-
nizer), turn the
~
REF OR DL Y POS control to underline
EVT.
j. If the instrument contains Option 09 (Word Recog-
nizer), turn the
~
control to underline event
A.
k. Push the upper TRIGGER MODE button to enter
Period mode.
I.
Push the upper TRIGGER MODE button to reinitialize
the auto-trigger level.
m. Turn the SEC/DIV to 5
µS.
4-32
n. Pull out the SEC/DIV knob.
o. Push the A/B MENU button for B Trigger MODE. Set
B Trigger MODE to RUN AFT DLY.
p. Adjust the ~ REF or DL Y POS for a delay of 5.00
µS.
q. Push the lower TRIGGER MODE button once.
r. Push the SLOPE button to select
+
SLOPE if
necessary.
s. Push lower TRIGGER MODE button twice to select
TRIG~ DLY.
t. Push the TRIGGER SLOPE button to illuminate the
- SLOPE indicator.
u. Adjust the ~ control for a delta time reading of
approximately 0.00
µS.
The word "SET" will appear while
making the adjustment.
v. VERIFY-There are two intensified zones on the
displayed waveform.
w. VERIFY-That the intensified zone moves on the
falling edge of the waveform while adjusting the TRIGGER
LEVEL control.
x. Push the lower TRIGGER MODE button to select
TRIG AFT DLY.
y. VERIFY-That the intensified zone moves on the ris-
ing edge of the waveform while adjusting the TRIGGER
LEVEL control.
z. Disconnect the test equipment from the instrument.