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: Triggers a sweep on the low to high transition of
an external TTL signal. 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:
(681X5B Models)
500 MHz to
≤
2.2 GHz:
<–50 dBc
>2,2 GHz to
≤
20 GHz:
<–60 dBc
>20 GHz to
≤
40 GHz:
<–40 dBc
(All Other 681XXB Models)
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
Harmonic and Harmonic Related (Models having a high-
end frequency of >40 GHz and units with Option 15A at
maximum specified leveled output power):
(681X5B Models)
500 MHz to
≤
2.2 GHz:
<–50 dBc
>2.2 GHz to
≤
20 GHz:
<–50 dBc
>20 GHz to
≤
40 GHz:
<–40 dBc
>40 GHz to
≤
50 GHz:
<–40 dBc (68175B)
>40 GHz to
≤
65 GHz:
<–30 dBc (68185B and 68195B)
(All Other 681XXB Models)
10 MHz to
≤
50 MHz:
<–30 dBc
>50 MHz to
≤
2 GHz:
<–40 dBc
>2 GHz to
≤
20 GHz:
<–50 dBc
>20 GHz to
≤
40 GHz:
<–40 dBc
>40 GHz to
≤
50 GHz:
<–40 dBc (68177B)
>40 GHz to
≤
65 GHz:
<–30 dBc (68187B and 68197B)
Nonharmonics:
(681X5B Models)
500 MHz to
≤
2.2 GHz:
<–50 dBc
>2.2 GHz to
≤
65 GHz:
<–60 dBc
(All Other 681XXB Models)
10 MHz to
≤
2
GHz:
<–40 dBc
>2 GHz to
≤
65 GHz:
<–60 dBc
SINGLE-SIDEBAND PHASE NOISE
(dBc/Hz)
Frequency
(GHz)
Offset From Carrier
100 Hz
1 kHz
10 kHz
100 kHz
0.6
(681X5B)
–87
–100
–98
–105
0.6
–77
–88
–86
–92
2.0
(681X5B)
–81
–88
–92
–99
2.0
–80
–88
–86
–96
6.0
–78
–88
–86
–93
10.0
–73
–86
–83
–91
20.0
–66
–81
–78
–85
26.5
–65
–78
–76
–83
40.0
–60
–75
–72
–79
50.0
–54
–69
–66
–73
65.0
–54
–62
–64
–73
B-2
681XXB OM
Changed: November 1995
PERFORMANCE
SPECIFICATIONS
