Atec Agilent-E8257D - Manual (Page 21)

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Stop sweep In/Out Open-collector, TTL-compatible input/output. In
ramp sweep operation, provides low level (nominally 0 V)
during sweep retrace and bandcross intervals, and
high level during the forward portion of the sweep.
Sweep will stop when grounded externally, sweep
will resume when allowed to go high.
Trigger output (dual mode) Outputs a TTL signal. High at start of dwell, or when
waiting for point trigger; low when dwell is over or
point trigger is received. In ramp sweep mode, pro-
vides 1601 equally-spaced 1us pulses (nom) across a
ramp sweep. When using LF Out, provides 2 us pulse
at start of LF sweep.
Trigger input Accepts 3.3V CMOS signal for triggering point-to-
point in manual sweep mode, or to trigger start of
LF sweep. Damage levels ≥ +10 V or ≤ –4 V.
Source module interface Provides power and leveling connections to the
millimeter source modules.
Source settled Provides an output trigger that indicates when the
signal generator has settled to a new frequency or
power level. High indicates source not settled, Low
indicates source settled.
Z-axis Blank/Markers During ramp sweep, supplies +5 V (nom) level
during retrace and bandswitch intervals.
Supplies –5 V (nom) level when the RF frequency
is at a marker frequency.
10 MHz EFC (Option UNR/UNX only) Accepts an external DC
voltage, ranging from –5 V to +5 V, for electronic
frequency control (EFC) of the internal 10 MHz
reference oscillator. This voltage inversely tunes the
oscillator about its center frequency approximately
–0.07 ppm/V. The nominal input impedance is
greater than 1 MΩ.
1 GHz Out (Option UNX only) Low noise 1 GHz reference output
signal, approximately +5 dBm (nom).