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Measurements
1780R-Series Operator’s Manual
4–5
NOTE. Freeze only available with Noise Reduction ON.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION> so that <ON> is outlined, then touch <FREEZE>.
<FREEZE> will be outlined.
The captured display remains on the screen even if the input signal is
removed. The display is lost when the DIFF PHASE menu is exited
by any method, including touching <GO TO DIFF GAIN>, pushing
any of the four front-panel menu buttons, pushing the front-panel
LINE SELECT button to enter Line Select mode, changing the
selected line if already in Line Select mode, or turning instrument
power off.
To exit Freeze mode, touch <FREEZE> again.
DIFF PHASE Measurement Information
The 1780R-Series provides two methods of making differential
phase measurements: single- and double-trace.
The single-trace method of differential phase measurement
resembles the single-trace differential phase mode on the 520A-Se-
ries. This method requires the operator to normalize the gains, but
those settings will be stored and recalled at next entry to DIFF
PHASE mode. The amount of distortion is read from the graticule
scale.
The double-trace method of differential phase measurement
resembles the double-trace differential phase in the R520A-Series.
This method requires the operator to null the space between the ends
and individual steps of the two traces. This provides greater accuracy
than the single-trace method, and gives an on-screen readout of the
distortion measurement.
Single-Trace DIFF PHASE Measurement Procedure
1. Apply a staircase signal or a ramp signal with subcarrier to the
1780R-Series.
2. Touch <SINGLE>.
Measurements
1780R-Series Operator’s Manual
4–5
NOTE. Freeze only available with Noise Reduction ON.
Freeze. To capture the display (right CRT only), touch <NOISE
REDUCTION> so that <ON> is outlined, then touch <FREEZE>.
<FREEZE> will be outlined.
The captured display remains on the screen even if the input signal is
removed. The display is lost when the DIFF PHASE menu is exited
by any method, including touching <GO TO DIFF GAIN>, pushing
any of the four front-panel menu buttons, pushing the front-panel
LINE SELECT button to enter Line Select mode, changing the
selected line if already in Line Select mode, or turning instrument
power off.
To exit Freeze mode, touch <FREEZE> again.
DIFF PHASE Measurement Information
The 1780R-Series provides two methods of making differential
phase measurements: single- and double-trace.
The single-trace method of differential phase measurement
resembles the single-trace differential phase mode on the 520A-Se-
ries. This method requires the operator to normalize the gains, but
those settings will be stored and recalled at next entry to DIFF
PHASE mode. The amount of distortion is read from the graticule
scale.
The double-trace method of differential phase measurement
resembles the double-trace differential phase in the R520A-Series.
This method requires the operator to null the space between the ends
and individual steps of the two traces. This provides greater accuracy
than the single-trace method, and gives an on-screen readout of the
distortion measurement.
Single-Trace DIFF PHASE Measurement Procedure
1. Apply a staircase signal or a ramp signal with subcarrier to the
1780R-Series.
2. Touch <SINGLE>.