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Chapter 1 17
Signal Generator Overview
Front Panel Display
UNLEVEL This annunciator appears when the signal generator is unable to maintain the
correct output level. The UNLEVEL annunciator is not necessarily an indication of
instrument failure. Unleveled conditions can occur during normal operation. A
second annunciator, ALC OFF, will appear in the same position when the ALC
circuit is disabled.
UNLOCK This annunciator appears when any of the phase locked loops are unable to
maintain phase lock. You can determine which loop is unlocked by examining the
error messages.
4. Digital Modulation Annunciators
All digital modulation annunciators (E8267D with Option 601/602 only) appear in this location. These
annunciators appear only when the modulation is active, and only one digital modulation can be
active at any given time.
5. Amplitude Area
The current output power level setting is shown in this portion of the display. Indicators are also
displayed in this area when amplitude offset is used, amplitude reference mode is turned on, external
leveling mode is enabled, a source module is enabled, and when user flatness is enabled.
6. Error Message Area
Abbreviated error messages are reported in this space. When multiple error messages occur, only the
most recent message remains displayed. Reported error messages with details can be viewed by
pressing
Utility > Error Info.
7. Text Area
This text area of the display:
• shows signal generator status information, such as the modulation status, sweep lists, and file
catalogs
• displays the tables
• enables you to perform functions such as managing information, entering information, and
displaying or deleting files
8. Softkey Label Area
The labels in this area define the function of the softkeys located immediately to the right of the
label. The softkey label may change depending upon the function selected.
ARB Dual Arbitrary Waveform Generator M-TONE Multitone Waveform Generator
CUSTOM Custom Real Time I/Q Baseband T-TONE Two-Tone Waveform Generator
DIGMOD Custom Arb Waveform Generator