Model 8642A/B
Operation
Operating Messages (cont'd)
2) select a valid sweep time setting (refer to RF Frequency Sweep, page 3-60), or
3) possibly turn off FM or select Special Function 208 (Prefer Divide Bands), or
4) refer to the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this
Section III.
AP.SWP PREVENTS FR.SWP .E52 4052
Amplitude sweep and frequency sweep cannot be done simultaneously. Turn off amplitude sweep (HP-IB:
AAOF ABOF) before attempting frequency sweep.
FM PREVENTS AUTO SWP .E53 4053
FM during Stepped Frequency Sweep is only possible in manual and single sweep modes. Possibly refer to
the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this Section HI.
AUTO SWP PREVENTS FM E54 4054
FM during Stepped Frequency Sweep is only possible in manual and single sweep modes. Possibly refer to
the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this Section III.
FR.SWP+FM+...LIMIT .E55 4055
FM is coupled with frequency sweep and one of those settings is limiting the setting of the other. This
message could also have been caused by executing Special Function 0 or 100 when one special function
was coupled to other instrument settings. Either set FM deviation to a value that is allowed by start and
stop frequencies, or set start and stop frequencies to values that allow the FM setting, or refer to the
Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this Section III.
DCFM+SP117+216 LIMIT E56 4056
DC-coupled FM, Special Function 117 (DCFM Update Mode), and Special Function 216 (DCFM
Correction On) are coupled with Special Function 123 (Phase Continuous Frequency Sweep), and one of
those settings is limiting the selection of a frequency sweep. To resolve this error, either:
1) turn off FM, or
2) select a non-dc-coupled FM source, or
3) turn off Special Function 117, or
4) turn on Special Function 11 6 (DC FM Correction Off), or
5) select a combination of those special functions, or
6) refer to the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this
Section HI.
PM PREVENTS AUTO SWP E57 4057
$M during Stepped Frequency Sweep is only possible in manual and single sweep modes. Possibly refer to
the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this Section III.
AUTO SWP PREVENTS PM .E58 4058
$M during Stepped Frequency Sweep is only possible in manual and single sweep modes. Possibly refer to
the Sequence Dependency discussion that begins on page 3-12 in the HP-IB portion of this Section III.
FREQ SWEEP + PM LIMIT E59 4059
<f>M is coupled with frequency sweep and one of those settings is limiting the setting of the other. Either
set $M deviation to a value that is allowed by start and stop frequencies, or set start and stop frequencies
to values that allow the 4>M setting, or refer to the Sequence Dependency discussion that begins on page
3-12 in the HP-IB portion of Section III.
3-189
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