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Front and Rear Panels
4.1 Front Panel
4.1.01 A and B (I) Signal Input Connectors
4.1.02 REF IN Connector
4.1.03 OSC OUT Connector
Figure 4-1, Model 7270 Front Panel Layout
As shown in figure 4-1, the model 7270's 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 A connector is the signal input connector for use in single-ended and differential
voltage mode. The B (I) connector is the signal input connector for use in differential
voltage mode (A-B) and for inverting single-ended voltage mode (-B mode). It is
also the signal input connector when the current input mode is selected.
When either input is overloaded the words INPUT OVERLOAD, in the top left-hand
corner of the screen, flash.
This is the general-purpose input connector for an external reference signal.
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
UNLOCKED flashes.
This is the output connector for the internal oscillator.
4
Chapter
4-1
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