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Measurements
1780R-Series Operator’s Manual
4–9
Table 4–2: DIFF GAIN Front-Panel Configuration
VECTORSCOPE Vector display enabled, other choices locked out.
WAVEFORM Demodulated sweep displayed, all front-panel choices
locked out. (There is no LED to indicate demodulated
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 GAIN 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 GAIN mode; the new settings will be saved when the
Measurement menu is exited, and reinstated when DIFF
GAIN mode is again enabled.
WAVEFORM POSITION The Horizontal and Vertical Position controls can be
adjusted while in DIFF GAIN mode; the new settings will be
saved when the Measurement menu is exited, and
reinstated when DIFF GAIN mode is again enabled. The
Vertical Position Control range is limited in order to keep the
signal on screen.
VOLTAGE & TIMING
CURSORS
Not available in DIFF GAIN mode.
Noise reduction can be used in both <SINGLE> and <DOUBLE>
modes.
NOTE. Freeze available only with Noise Reduction ON.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION ON>, then touch <FREEZE>.
Measurements
1780R-Series Operator’s Manual
4–9
Table 4–2: DIFF GAIN Front-Panel Configuration
VECTORSCOPE Vector display enabled, other choices locked out.
WAVEFORM Demodulated sweep displayed, all front-panel choices
locked out. (There is no LED to indicate demodulated
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 GAIN 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 GAIN mode; the new settings will be saved when the
Measurement menu is exited, and reinstated when DIFF
GAIN mode is again enabled.
WAVEFORM POSITION The Horizontal and Vertical Position controls can be
adjusted while in DIFF GAIN mode; the new settings will be
saved when the Measurement menu is exited, and
reinstated when DIFF GAIN mode is again enabled. The
Vertical Position Control range is limited in order to keep the
signal on screen.
VOLTAGE & TIMING
CURSORS
Not available in DIFF GAIN mode.
Noise reduction can be used in both <SINGLE> and <DOUBLE>
modes.
NOTE. Freeze available only with Noise Reduction ON.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION ON>, then touch <FREEZE>.