Dwell Time Per Step: Variable from 1 ms to 99 seconds
Switching Time (typical maximum): <7 ms + 1 ms/GHz
step size or <25 ms, whichever is less.
ALTERNATE SWEEP MODE
Sweeps alternately in analog or step sweep between any two
sweep ranges. Each sweep range may be associated with a
power level.
MANUAL SWEEP MODE
Provides stepped, phase-locked adjustment of frequency be-
tween sweep limits. User-selectable number of steps or step
size.
360B VNA SOURCE LOCK MODE
Under control of the WILTRON 360B Vector Network Ana-
lyzer, the synthesized sweep generator is phase-locked at a
typical <7 ms/step sweep speed. Frequency resolution is
limited to 100 kHz.
PROGRAMMABLE FREQUENCY AGILITY
Under GPIB control, up to 1000 non-sequential frequencies
can be stored and then addressed as a phase-locked step
sweep. Data stored in volatile memory.
MARKERS
Up to 20 independent, settable markers (F0 – F9 and M0 –
M9).
Video Markers: +5V or –5V marker output, selectable from
system menus. BNC and AUX I/O connectors, rear panel.
Intensity Markers (Available in Analog Sweeps of <1 Sec-
ond Sweep Time): Produces an intensified dot on trace,
obtained by momentary dwell in RF sweep.
Marker Accuracy: Same as sweep frequency accuracy.
Marker Resolution (Analog Sweep):
1 MHz or Sweep Width/4096, whichever is greater.
Marker Resolution (Step Sweep):
1 kHz (0.1 Hz with Option 11)
SWEEP TRIGGERING
Sweep triggering is provided for Analog Frequency Sweep,
Step Frequency Sweep, and CW Power Sweep.
Auto: Triggers sweep automatically.
External: Accepts a TTL low-level signal of 1
µ
s width to
trigger a sweep. AUX I/O connector, rear panel.
Single: Triggers, aborts, and resets a single sweep. Reset
sweep may be selected to be at the top or bottom of the
sweep. The pen lift will activate at sweep speeds
≥
1 second.
SPECTRAL PURITY
All specifications apply to the phase-locked CW and Step
Sweep modes at the lesser of +10 dBm output or maximum
specified leveled output power, unless otherwise noted.
SPURIOUS SIGNALS
Harmonic and Harmonic Related:
10 MHz to
≤
50 MHz:
<–30 dBc
>50 MHz to
≤
2 GHz:
<–40 dBc
>2 GHz to
≤
20 GHz:
<–60 dBc
>20 GHz to
≤
40 GHz:
<–40 dBc
Nonharmonics:
10 MHz to
≤
2
GHz:
<–40 dBc
>2 GHz to
≤
40 GHz:
<–60 dBc
SINGLE-SIDEBAND PHASE NOISE
(dBc/Hz)
POWER LINE and FAN ROTATION SPURIOUS
EMISSIONS (dBc)
Frequency
Range
(GHz)
Offset From Carrier
100 Hz
1 kHz
10 kHz
100 kHz
0.01 to
≤
8.4
<–70
<–78
<–86
<–90
>8.4 to
≤
20
<–61
<–74
<–76
<–85
>20 to
≤
40
<–55
<–68
<–70
<–79
Frequency
Range
(GHz)
Offset From Carrier
<300 Hz
300Hz to 1 kHz
>1 kHz
0.01 to
≤
8.4
<–50
<–60
<–60
>8.4 to
≤
20
<–46
<–56
<–60
>20 to
≤
40
<–40
<–50
<–54
PERFORMANCE
SPECIFICATIONS
B-2
681XXB OM