Operating Instructions
2–6
1720/1721
5. EXT REF
A bridging loop-through input (compensated for 75Ω) for synchronizing signals.
As factory shipped, the input signal may be black burst or composite video.
Changing a pair of internal plug jumpers makes it possible to use CW Subcarrier
as an external reference; however, horizontal (line) sync must be present on the
CH-A INPUT for synchronization. External reference is selected by the
front-panel REF switch.
6. CH-B
A bridging loop-through input for composite video signal, compensated for 75Ω.
The input signal for display is selected by the front-panel INPUT switch.
7. CH-A
A bridging loop-through input for composite video signal, compensated for 75Ω.
The input signal for display is selected by the front-panel INPUT switch.
8. AC FUSE
A holder for an F-type cartridge fuse which is the instrument ac mains supply
fuse.
Using the 1720/1721 in AUXILIARY Mode
When the serial interface AUXILIARY cable (between the 1720/1721 and a
1730-Series) is connected, the 1720/1721 can be operated in the AUXILIARY
mode. The 1720/1721 AUXILIARY mode allows the Input and Reference
switching to follow the similar switches on the waveform monitor. For example,
when the 1730-Series INPUT switch is changed from A to B, the 1720/1721
INPUT switch will also change to B. Even though the vectorscope switching
(INPUT and REF) follows the waveform monitor, the vectorscope INPUT and
REF switches remain active so that they can be changed without changing the
waveform monitor switching. The following functions can be controlled by the
1730-Series in AUXILIARY mode:
INPUT switching
REFerence switching
LINE SELECT
STORE and RECALL
INPUT switching allows the 1730-Series to select any of the three inputs (CH-A,
CH-B, or BOTH) when AUXILIARY is ON. Note that the 1720/1721 INPUT
INPUT Switching
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