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3. On the 682XXB/683XXB:
a.
Press MODULATION , then Pulse to go to the
Internal Pulse Status Menu display.
b.
Press Edit Width and set W1 to the pulse
width noted in the Test Record.
c.
Press On/Off to turn on pulse modulation.
4. On the Oscilloscope, observe that the nominal
level of the displayed pulse peak has shifted ver
-
tically, slightly off of the centerline. It may be
necessary to readjust the scope trigger level.
5. On the 682XXB/683XXB:
a.
Press CW/SWEEP SELECT to return to the
CW Menu display.
b. Record the value of the output level L1, shown
in the Level display area, on the Test Record.
c.
Press Edit L1 and adjust the power level until
the nominal peak level is evenly centered on
the display centerline reference.
d. Record this value of the output level L1 on the
Test Record.
6. Subtract the L1 reading recorded in step 5.d from
the reading recorded in step 5.b. This is the pulse
level error. Record it on the Test Record.
7. On the 682XXB/683XXB:
a.
Press Edit L1 and set L1 to the maximum lev
-
eled output power level for the instrument be
-
ing tested (refer to Table 3-2, page 3-6).
b.
Press MODULATION , then Pulse to return to
the Internal Pulse Status Menu display.
c.
Press On/Off to turn off pulse modulation.
8. Repeat steps 1 through 7 for any other frequen
-
cies and pulse widths noted in the Test Record.
Record the results on the Test Record.
3-42 682XXB/683XXB MM
PERFORMANCE PULSE MODULATION TESTS:
VERIFICATION RISE TIME, FALL TIME, OVERSHOOT, AND LEVEL