18 Chapter 1
E4428C Analog Signal Generator Overview
Rear Panel Overview
4. LAN Connector
LAN based communication is supported by the signal generator via the LAN (local area network) connector.
The LAN connector enables the signal generator to be remotely programmed by a LAN-connected
computer. The distance between a computer and the signal generator is limited to 100 meters (10Base-T) on
a single cable. For more information about the LAN, refer to the E4428C/38C ESG Signal Generators
Programming Guide.
5. 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.
6. 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
damage levels are > +5.5 volts and < −0.5 volts.
7. 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.
8. 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.
9. 10 MHz OUT Connector
This female BNC connector provides a nominal signal level of +3.9 dBm ±2 dB, and an output impedance
of 50Ω. The accuracy is determined by the timebase used.
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