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Front and Rear Panels
4.1 Front Panel - Main Console
4.1.01 AUX Signal Input Connector
4.1.02 MON Connector
4.1.03 REF IN Connector
Figure 4-1, Model 7124 Main Console Front Panel Layout
As shown in figure 4-1, the model 7124's main console front panel has four BNC
connectors, a 320 × 240 pixel color LCD display panel, ten double and four single
keys positioned adjacent to the screen, four cursor-movement keys and a 12-button
keypad. The following sections describe the function and location of these items.
The AUX connector is the auxiliary signal input connector, with fixed full-scale
sensitivity of 1.0V and input impedance of 10 M. It can be used as the input to
the main signal channel instead of the signal being received from the 7124 RCU via
the fiber link.
When the input is overloaded the words INPUT OVERLOAD, in the top left-hand
corner of the screen, flash.
The signal at this connector is that immediately prior to the main analog-to-digital
converter, as received from the 7124 RCU via the fiber optic link or the AUX signal
input connector.
This is the general-purpose input connector for an external reference signal when
this is applied at the main console as opposed to the 7124 RCU.
NOTE: If the best possible phase accuracy at low external reference frequencies is
required, then a TTL reference signal should be applied to the rear panel
TTL REF IN input instead.
When external reference mode is selected the word LOCKED appears in highlighted
text along the top edge of the screen. Under unlock conditions the word LOCKED
4
Chapter
4-1
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