3-14 PULSE MODULATION
TESTS: RISE TIME,
FALLTIME, OVER-
SHOOT, AND LEVEL
Pulse modulation tests verify correct operation as
well as rise time, fall time, overshoot, and level. The
pulse leveling accuracy test compares the pulsed RF
output level to verify the performance of the level
detector(s), detector amplifiers, and ALC sample/
hold circuits.
TestSetup Connect the equipment, shown in Figure 3-10, as
follows:
1. Connect the 682XXB/683XXB rear panel PULSE
SYNC OUT to the Oscilloscope TriggerInput.
2. Connect the Pulse Detector Output to the Vertical
Input of the Oscilloscope.
3. On the Oscilloscope, select 50Winput impedance.
4. Connect the Pulse Detector Input through a
150 MHz High Pass Filter to the 682XXB/
683XXB RF OUTPUT.
682XXB/683XXB MM 3-39
PERFORMANCE PULSE MODULATION TESTS:

VERIFICATION RISE TIME, FALL TIME, OVERSHOOT, AND LEVEL

RF Out
Pulse
Detector
150 MHz HPF
(For Overshoot
Measurement)
CH. 4 Trigger

682XXB / 683XXB

Pulse
Sync Out
CH. 2 Input

Oscilloscope

Figure 3-10. Equipment Setup for Pulse Modulation Tests:Rise Time, Fall Time, Overshoot, and Level