Chapter 2 29
E4438C Vector Signal Generator Overview
Front Panel Overview
13. LF OUTPUT Connector
This BNC connector is the output for modulation signals generated by the low frequency (LF) source
function generator. This output is capable of driving 3 V
p
(nominal) into a 50Ω load.
On signal generators with Option 1EM, this output relocated to a rear-panel SMB connector.
14. RF OUTPUT Connector
This female Type-N connector is the output for RF signals. The source impedance is 50Ω. For Options 501,
502, 503, and 504 the damage levels are 50 Vdc, 50 W at ≤ 2 GHz, and 25 W at > 2 GHz maximum. For
Options 501, 502, 503, and 504 the reverse power protection circuit will trip, however, at nominally 1 W.
CAUTION E4428C and E4438C signal generators with Option 506 are not equipped with reverse
power protection circuits.
On signal generators with Option 1EM, this output relocated to a rear-panel female Type-N connector.
15. Mod On/Off Key
Pressing this hardkey enables or disables all active modulation formats (AM, FM, ΦM, Pulse, or I/Q) that
are applied to the output carrier signal.
This hardkey does not set up or activate an AM, FM, ΦM, Pulse, or I/Q format; each individual modulation
format must still be set up and activated (for example, AM > AM On) or nothing will be applied to the output
carrier signal when the
Mod On/Off hardkey is enabled.
The MOD ON/OFF annunciator, which is always present on the display, indicates whether active modulation
formats have been enabled or disabled with the
Mod On/Off hardkey.
16. RF On/Off Key
This hardkey toggles the operating state of the RF signal present at the RF OUTPUT connector. The
RF On/Off annunciator is always visible in the display to indicate whether the RF is turned on or off.
17. Numeric Keypad
The numeric keypad consists of the 0 through 9 hardkeys, a decimal point hardkey, and a backspace hardkey
( ). The backspace hardkey enables you to backspace or specify a negative value. When specifying a
negative numeric value, the negative sign must be entered prior to entering the numeric value.
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