Tektronix 1710J Series, Instruction Manual

Page: 29 / 252

Getting Started
1710J-Series Waveform Monitors
1–5
In many cases, because the bridging loop-through connection is passive, you can
install the 1710J-Series Waveform Monitor directly in the program line, in which
case line termination occurs at another location. Again line termination is
critical. If the line is unterminated, signal amplitude will be double (2 V instead
of the normal 1 V) and will be easily recognized in the displayed amplitude. If
for some reason the program line is double terminated, the displayed amplitude
will be only 0.5 V full scale instead of the typical 1 V full scale.
The external reference, normally house sync, is usually routed around on a 75
W
coaxial line. When connecting to this line it is also important that the line be
correctly terminated. Because this input is also a high impedance bridging
loop-through, the same considerations that apply to the program line also apply
to this line.
Figure 1–2 is a simple diagram of a 1710J-Series Waveform Monitor being used
on the program and sync lines. Note that in this application the monitor is not at
the end of either line.
Waveform Monitor
Terminated
in 75
W
Program line out Program line in
75
W
Source
CH A
Terminated
in 75
W
House sync out
House
sync in
75
W
Source
EXT REF
Figure 1–2: A Waveform Monitor installed in program and house sync lines