The Video Display Clamp
013-0278-00 Video Display Clamp
5
Specifications
The electrical characteristics found in these tables of warranted characteristics
apply when operating at an ambient temperature between 0
_
C and +50
_
C.
Table 1: Warranted Characteristics — Signal Pass Through (Insertion Characteristics)
Name
Description
Bandwidth
The bandwidth of the video clamp signal path with the
oscilloscope input coupling set to 1 M
Ω
and the input of
the clamp is terminated into 75
Ω
.
--3 dB at 70 MHz (100 MHz typical),
±
1 dB out to 30 MHz (60 MHz
typical)
Gain Error
Error does not include the vertical error of the
oscilloscope or the error in the terminator.
±
2.5%
Table 2: Warranted Characteristics — Signal Input Impedance (Return Characteristics)
Name
Description
Input Resistance
Only applies when the video display clamp is operating.
≥
15 k
Ω
Table 3: Warranted Characteristics — Video Display Clamp
Name
Description
60 Hz Rejection
Measured with 1 V
p-p
NTSC video signal with 1 V
p-p
60 Hz interference signal.
21 dB (NTSC or PAL, typical) worst case. Faster speed standards have
better rejection.
60 Hz Modulation
The maximum amount of 60 Hz interference that the
clamp functions under.
1 V
p-p
(NTSC and PAL)
0.5 V
p-p
(HDTV)
Video Input Amplitude
240 mV to 570 mV sync tip height (measured from the top of the sync
tip to the back porch).
If the video information does not extend below the back porch, these
limits translate to approximately 0.85 V
p-p
to 2 V
p-p
of video signal
amplitude.
Back Porch Correction
The maximum voltage between the back porch and
ground the video clamp can correct.
±
1 V
