28 Chapter 2
E4438C Vector Signal Generator Overview
Front Panel Overview
9. EXT 1 INPUT Connector
This BNC input connector accepts an input signal for use with AM, FM, ΦM, and pulse modulation, or as
the linear control for a burst envelope. The damage levels are 5 V
rms
and 10 V
p
.
On signal generators with Option 1EM, this input is relocated to an SMB connector on the rear panel.
10. EXT 2 INPUT Connector
This BNC input connector accepts an input signal for use with AM, FM, ΦM, and pulse modulation. The
damage levels are 5 V
rms
and 10 V
p
.
If you configure your signal generator with Option 1EM, this input is relocated to an SMB connector on the
rear panel.
11. Help Key
Press this key to display a short description of any hardkey or softkey. There are two help modes available:
single and continuous. Single mode is the factory preset condition. To toggle between single and continuous
mode, press
Utility > Instrument Info/Help Mode > Help Mode Single Cont.
12. Trigger Key
This hardkey initiates an immediate trigger event for a function such as a list or step sweep. The trigger
mode must be set to
Trigge r K e y prior to initiating a trigger event with this hardkey.
AM, FM, ΦM ±1V
p
produces the indicated deviation or depth. When using the AC coupled input selection with a
signal that has a peak input voltage that differs from 1 V
p
by more than 3%, the signal generator
displays the HI/LO annunciator.
Pulse Modulation +1 V is on and 0 V is off
Burst Envelope Provides linear control: −1 V = 0% amplitude and 0 V = 100% amplitude
AM, FM, ΦM ±1V
p
produces the indicated deviation or depth. When using the AC coupled input selection with a
signal that has a peak input voltage that differs from 1 V
p
by more than 3%, the signal generator
displays HI/LO annunciator.
Pulse Modulation +1 V is on and 0 V is off
Single Mode The help text is provided for the next key you press without activating the key’s function. Any key
pressed afterward exits the help mode and activates the key’s function
Continuous Mode The help text is provided for each subsequent key press until you either press the
Help key again, or
change to single mode. In continuous mode, pressing the
Help key also activates the key’s function
(except for the
Preset key).
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