Pulse
Leveling
Accuracy
The following procedure lets you measure the pulsed
RF output level and CW output level and compare
them to verify pulse leveling accuracy.
1. On the 682XXB/683XXB:
a. Press On/Off (Internal Pulse Status menu) to
turn off pulse modulation.
b. Press CW/SWEEP SELECT toreturn to the
CW Menu display.
c. At the CW menu, press Edit F1 andset F1 to
the frequency noted in the TestRecord.
2. On the Oscilloscope:
a. Adjust the vertical offset to place the trace ex-
actly on the center graticule; this is used as the
CW-levelreference line.
b. Use the Auto Triggering mode to continue
sweeping the display when the pulse is off.
c. Adjust the vertical sensitivity to the most sen-
sitive setting (mV/div) possible while keeping
the trace at the center graticule reference line.
682XXB/683XXB MM 3-41
PULSE DETECTOR OUTPUT WAVEFORM
Percentage
of Detected
Waveform
0%
2%
36%
86%
100%
114%
0%
10%
50%
90%
100%
114%
T
RISE
T
FALL
Corresponding
Percentage
of RF Voltage
PULSE WIDTH
Note: Waveform shown is for
a negative output detector.
0%
10%
OVER-
SHOOT
Figure 3-11. Measurement Parameters for a Pulse Modulation Waveform
PERFORMANCE PULSE MODULATION TESTS:
VERIFICATION RISE TIME, FALL TIME, OVERSHOOT, ANDLEVEL