HORIZ OUT (Horizontal Sweep Output): Provides 0V at
beginning and +10V at end of sweep for all sweep modes,
regardless of sweep width. In CW mode, the voltage is pro-
portional to frequency between 0V at low end and +10V at
the high end of range. In CW mode, if CW RAMP is enabled,
a repetitive, 0V to +10V ramp is provided.
MARKER OUT: Provides a +5V or –5V signal at each fre-
quency marker in a sweep. Signal polarity selectable from
system menu.
PEN LIFT OUT: Provides normally-open or normally-closed
relay contacts, selectable from system menu, during band-
switch points and retrace.
RETRACE BLANK OUT: Provides a +5V or –5V signal co-
incident with sweep retrace. Signal polarity selectable from
system menu.
SEQ SYNC OUT (Sequential Sync Output): P rovi des a
+5V signal during retrace, at bandswitching points, and dur-
ing each frequency step in step sweep mode, –5V during
markers, and –10V during the selected marker.
DWELL IN: Accepts an external TTL low-level signal to
pause the sweep in both analog and step sweep modes. The
sweep resumes when the signal is removed.
V/GHz OUT: Provides a reference voltage relative to the RF
output frequency (refer to the table below).
AUX I/O (Auxiliary Input/Output): Provides for most of the
rear panel BNC connections through a single, 25-pin, D-type
connector. Supports master-slave operation with another
68XXXB synthesizer and allows for a single-cable interface
with the Model 562 Scalar Network Analyzer and other WIL-
TRON instruments. For a pinout diagram and descriptions,
see Appendix A, Figure A-2.
SERIAL I/O (Serial Input/Output): Pr ov i de s ac ce ss to
RS-232 terminal ports to support service and calibration func-
tions, and master-slave operations.
IEEE-488 GPIB: Provides input/output connections for the
General Purpose Interface Bus (GPIB). For a pinout diagram,
see Appendix A, Figure A-3.
OPTIONS
Option 1, Rack Mounting: Rack mount kit containing a set
of track slides (90
°
tilt capability), mounting ears, and front
panel handles to let the instrument be mounted in a standard
19-inch equipment rack.
Option 2A, 110 dB Step Attenuator: Adds a 10 dB/step
attenuator with 110 dB range for models having a high-end
frequency of
≤
26.5 GHz. Rated RF output power is reduced.
Option 2B, 110 dB Step Attenuator: Adds a 10 dB/step
attenuator with 110 dB range for models having a high-end
frequency of
≤
40 GHz. Rated RF output power is reduced.
Option 2C, 90 dB Step Attenuator: Adds a 10 dB/step
attenuator with 90 dB range for models having a high-end
frequency of
≤
50 GHz. Rated RF output power is reduced.
Option 2D, 90 dB Step Attenuator: Adds a 10 dB/step
attenuator with 90 dB range for models having a high-end
frequency of
≤
60 GHz. Rated RF output power is reduced.
Option 9, Rear Panel RF Output: Moves the RF output
connector to the rear panel.
Option 11, 0.1 Hz Frequency Resolution: P rovi des fre-
quency resolution of 0.1 Hz.
Option 14, WILTRON 360B VNA Compatibility: Modifies
rack mounting hardware to mate unit in a WILTRON 360B
VNA console.
Option 15A, High Power Output: Adds high-power RF
components to the instrument in the 2-26.5 GHz frequency
range. Option 15A is standard in models having a high-end
frequency that is >40 GHz.
Option 16, High-Stability Time Base: Adds an ovenized,
10 MHz crystal oscillator as a high-stability time base.
Option 17A, Delete Front Panel: Deletes the front panel
for use in remote control applications where a front panel
display and keyboard control are not needed.
Option 19, SCPI Programmability: Adds GPIB command
mnemonics complying with Standard Commands for Pro-
grammable Instruments (SCPI), Version 1993.0 SCPI pro-
gramming complies with IEEE 488.2-1987.
Model Number
V/GHz Output
68137B, 68145B, 68147B
1.0V/GHz
68153B, 68155B, 68159B
0.5V/GHz
68163B, 68165B, 68169B
0.5V/GHz
68175B, 68177B
0.25V/GHz
68185B, 68187B
0.25V/GHz
68195B, 68197B
0.25V/GHz
PERFORMANCE
SPECIFICATIONS
B-8
681XXB OM
