Performance Verification
013-0278-00 Video Display Clamp
9
50
Ω
terminator
Video display clamp
Coaxial cable
Pulse
Generator
2.5X attenuator
Dual-input
coupler
Figure 6: Back porch test setup
3.
Set the pulse generator as follows (viewed with channel 2):
H
Set the compliment to --
H
Adjust the period to 15 kHz
H
Adjust the pulse duration to 5
s
H
Set the high level to 1.0 volts
H
Set the low level to 0.75 volts
4.
Set the Video Display Clamp as follows:
H
Polarity
to
--
(negative)
H
Filter
to
Off
5.
Set the test oscilloscope to display channel 1 (channel 2 off).
6.
Verify that the positive portion of the pulse is within
±
14 mV of the ground
reference (see Figure 7).
