Chapter 2 45
E4438C Vector Signal Generator Overview
Rear Panel Overview
19. TRIG OUT Connector
This female BNC connector outputs a TTL signal that is asserted high at the start of a dwell sequence, or at
the start of waiting for the point trigger in manual sweep mode. It is asserted low when the dwell is over,
when the point trigger is received, or once per sweep during an LF sweep. The logic polarity can be
reversed.
20. BURST GATE IN Connector (Option 001/601 or 002/602)
The female BNC connector accepts a CMOS signal for gating burst power in digital modulation
applications. The burst gating is used when you are externally supplying data and clock information. The
input signal must be synchronized with the external data input that will be output during the burst. The burst
power envelope and modulated data are internally delayed and re-synchronized. The input signal must be
CMOS high for normal burst RF power or CW RF output power and CMOS low for RF off. The leading
edges must be synchronous with the DATA CLOCK rising edges. The damage levels are > +5.5 volts and
< −0.5 volts.
If you configure your signal generator with Option 1EM, this output is changed from a BNC to an SMB
connector. With Option 401, this connector is used for system reset trigger input.
21. TRIG IN Connector
This female BNC connector accepts a CMOS signal for triggering operations, such as point-to-point in
manual sweep mode or an LF sweep in external sweep mode. Triggering can occur on either the positive or
negative edge. The d
amage levels are > +5.5 volts and < −0.5 volts.
22. 10 MHz IN Connector
This female BNC connector accepts a −3.5 to +20 dBm signal from an external timebase reference that is
within ±10 ppm (standard timebase) or ±1 ppm (high stability timebase). The nominal input impedance is
50Ω. The signal generator detects when a valid reference signal is present at this connector and
automatically switches from internal to external reference operation. The signal generator will only
automatically switch from internal to external reference operation when the instrument is in its factory
default mode where the
Ref Oscillator Source Auto Off On softkey is set to on.
23. SWEEP OUT Connector
This female BNC connector provides a voltage range of 0 to +10 V. When the signal generator is sweeping,
the SWEEP OUT signal ranges from 0 V at the beginning of the sweep to +10 V at the end of the sweep
regardless of the sweep width. In CW mode this connector has no output. The output impedance is less than
1Ω and can drive 2 kΩ.
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