3. On the 682XXB/683XXB:
a. Press MODULATION, then Pulse to go to the
Internal Pulse Status Menu display.
b. Press Edit Width andset W1 to the pulse
width noted in the TestRecord.
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 TestRecord.
c. Press Edit L1 andadjust 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
TestRecord.
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 andset L1 to the maximum lev-
eled output power level for the instrument be-
ing tested (refer to Table3-2, 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 TestRecord.
Record the results on the TestRecord.
3-42 682XXB/683XXB MM
PERFORMANCE PULSE MODULATION TESTS:
VERIFICATION RISE TIME, FALL TIME, OVERSHOOT, ANDLEVEL