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3-11 Leveling
Operations
The MG3692B provides main band leveled output power over a maxi
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mum range of up to 32 dB (up to 135 dB with Option 2) for CW and
sweep frequency operations. Instruments with Option 15 provide lev
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eled output power over a maximum range of up to 24 dB (up to 133 dB
with Option 2). An automatic level control (ALC) system controls the
amplitude and power level of the RF output. You can select the ALC
mode of operation—internal, external (detector or power meter), or
fixed gain (ALC off). In addition, the signal generator provides a de
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couple function that allows decoupling of the step attenuator (if
equipped) from the ALC system and a user level (flatness correction)
calibration function that provides compensation for path-varia
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tions-with-frequency in a test setup.
The following paragraphs provide descriptions and operating instruc
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tions for the leveling modes and functions. Use the Leveling Modes
menu map (Chapter 4, Figure 4-10) to follow the menu sequences.
Selecting a
Leveling Mode
The ALC system is a feedback control system, in
which the output power is measured at a detector
and compared with the expected power level. If the
output and desired power levels do not equal, the
ALC adjusts the power output until they do. The
ALC feedback signal can come from either the inter-
nal detector or an external detector or power meter.
Alternatively, the output power can be set to a fixed
level without using the normal feedback (ALC off).
The ALC mode menu lets you select a leveling mode.
To access the ALC Mode menu, first press Level .
At the Level/ALC Select menu display, press
ALC Mode . The ALC Mode menu (below) is dis
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played.
MG369XB OM 3-63
Local (Front Panel) Operation Leveling Operations