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Measurements
4–4
1780R-Series Operator’s Manual
Table 4–1: DIFF PHASE Front-Panel Configuration
VECTORSCOPE Vector display enabled, other choices locked out.
WAVEFORM R–Y sweep displayed, all front-panel choices locked out.
(There is no LED to indicate R–Y sweep.)
INPUT Status does not change. All differential modes locked out; if
a differential mode was enabled, input is forced to CH A.
REFERENCE Status does not change.
FILTER Locked out.
WFM SWEEPS Set to One Line when DIFF PHASE is selected. If
<SINGLE> mode is selected, any of the other sweeps can
be selected, using front-panel controls. If <DOUBLE> is
selected, the instrument is set to One Line. The Field, Two
Line and Three Line Sweeps are locked out.
GAINS Vectorscope and Waveform gains can be adjusted while in
DIFF PHASE mode; the new settings will be saved when
the Measurement menu is exited, and reinstated when DIFF
PHASE mode is again enabled.
WAVEFORM POSITION The Horizontal and Vertical Position controls can be
adjusted while in DIFF PHASE mode; the new settings will
be saved when the Measurement menu is exited, and
reinstated when DIFF PHASE mode is again enabled. The
Vertical Position Control range is limited in order to keep the
signal on screen.
VOLT / TIME CURSOR Not available in DIFF PHASE mode.
Noise Reduction. Touch <NOISE REDUCTION> to toggle between
<ON> and <OFF>. When noise reduction is off, the demodulator
output (500 kHz BW) is directly displayed. When noise reduction is
on, noise reduction of about 10–12 dB is accomplished without any
reduction in bandwidth.
Noise reduction can be used in both <SINGLE> and <DOUBLE>
modes.
Measurements
4–4
1780R-Series Operator’s Manual
Table 4–1: DIFF PHASE Front-Panel Configuration
VECTORSCOPE Vector display enabled, other choices locked out.
WAVEFORM R–Y sweep displayed, all front-panel choices locked out.
(There is no LED to indicate R–Y sweep.)
INPUT Status does not change. All differential modes locked out; if
a differential mode was enabled, input is forced to CH A.
REFERENCE Status does not change.
FILTER Locked out.
WFM SWEEPS Set to One Line when DIFF PHASE is selected. If
<SINGLE> mode is selected, any of the other sweeps can
be selected, using front-panel controls. If <DOUBLE> is
selected, the instrument is set to One Line. The Field, Two
Line and Three Line Sweeps are locked out.
GAINS Vectorscope and Waveform gains can be adjusted while in
DIFF PHASE mode; the new settings will be saved when
the Measurement menu is exited, and reinstated when DIFF
PHASE mode is again enabled.
WAVEFORM POSITION The Horizontal and Vertical Position controls can be
adjusted while in DIFF PHASE mode; the new settings will
be saved when the Measurement menu is exited, and
reinstated when DIFF PHASE mode is again enabled. The
Vertical Position Control range is limited in order to keep the
signal on screen.
VOLT / TIME CURSOR Not available in DIFF PHASE mode.
Noise Reduction. Touch <NOISE REDUCTION> to toggle between
<ON> and <OFF>. When noise reduction is off, the demodulator
output (500 kHz BW) is directly displayed. When noise reduction is
on, noise reduction of about 10–12 dB is accomplished without any
reduction in bandwidth.
Noise reduction can be used in both <SINGLE> and <DOUBLE>
modes.