4-12.
PULSE MODULATION RISE AND FALL TIME TEST
NOTE
THIS TEST IS NOT APPLICABLE TO INSTRUMENTS EQUIPPED WITH
OPTION 006, DELETE PULSE MODULATION.
Specification
Table 4-25.
Pulse Modulation Rise and Fall Time Test Specification
For CW mode and frequencies =400MHz only:
Rise (TR) and Fall (TF) Times:
<25 nanoseconds
Description
The OUT’s RF output frequency is down converted to 50 MHz using a mixer and a local oscillator. The
50 MHz IF signal is amplified and applied to an oscilloscope. The DUT is pulsed using a pulse
generator. The pulse generator output is also applied to the oscilloscope. The oscilloscope is used to
measure the pulse envelope rise and fall times. Refer to Figure 4-12 Pulse Definitions.
Tv
-
TRF -RF Pulse Length
TV
-Input Pulse Length
T0
-Delay Time
Vp -RF Pulse Amplitude
TR -RE
Pulse Rise Time
TF -RE Pulse Fall Time
VOR.Overshoot and Ringing
-Video Feedthrough
Figure 4-12.
Pulse Definitions
HP 8340B/41B
Performance Tests
4-57