Anritsu 682XXB - Manual (Page 101)

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 to return to the
CW Menu display.
c. At the CW menu, press Edit F1 and set F1 to
the frequency noted in the Test Record.
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-level reference 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, AND LEVEL